Tags

Below is a list of problems classified by tags, suitable for focused practice on a certain type of problem.

0-1 BFS

• 1368. Minimum Cost to Make at Least One Valid Path in a Grid
• 2290. Minimum Obstacle Removal to Reach Corner

0-1 Knapsack

• 416. Partition Equal Subset Sum
• 474. Ones and Zeroes
• 494. Target Sum
• 879. Profitable Schemes
• 956. Tallest Billboard
• 1049. Last Stone Weight II
• 2915. Length of the Longest Subsequence That Sums to Target
• 3082. Find the Sum of the Power of All Subsequences

A* Search

• 499. The Maze III 🔒
• 505. The Maze II 🔒
• 773. Sliding Puzzle
• 818. Race Car
• 1197. Minimum Knight Moves 🔒

Aho-Corasick

• 616. Add Bold Tag in String 🔒
• 758. Bold Words in String 🔒
• 1032. Stream of Characters
• 1065. Index Pairs of a String 🔒

Algorithm X

• 37. Sudoku Solver
• 51. N-Queens
• 52. N-Queens II

Array

• 1. Two Sum
• 4. Median of Two Sorted Arrays
• 11. Container With Most Water
• 14. Longest Common Prefix
• 15. 3Sum
• 16. 3Sum Closest
• 18. 4Sum
• 26. Remove Duplicates from Sorted Array
• 27. Remove Element
• 31. Next Permutation
• 33. Search in Rotated Sorted Array
• 34. Find First and Last Position of Element in Sorted Array
• 35. Search Insert Position
• 36. Valid Sudoku
• 37. Sudoku Solver
• 39. Combination Sum
• 40. Combination Sum II
• 41. First Missing Positive
• 42. Trapping Rain Water
• 45. Jump Game II
• 46. Permutations
• 47. Permutations II
• 48. Rotate Image
• 49. Group Anagrams
• 51. N-Queens
• 53. Maximum Subarray
• 54. Spiral Matrix
• 55. Jump Game
• 56. Merge Intervals
• 57. Insert Interval
• 59. Spiral Matrix II
• 63. Unique Paths II
• 64. Minimum Path Sum
• 66. Plus One
• 68. Text Justification
• 73. Set Matrix Zeroes
• 74. Search a 2D Matrix
• 75. Sort Colors
• 78. Subsets
• 79. Word Search
• 80. Remove Duplicates from Sorted Array II
• 81. Search in Rotated Sorted Array II
• 84. Largest Rectangle in Histogram
• 85. Maximal Rectangle
• 88. Merge Sorted Array
• 90. Subsets II
• 105. Construct Binary Tree from Preorder and Inorder Traversal
• 106. Construct Binary Tree from Inorder and Postorder Traversal
• 108. Convert Sorted Array to Binary Search Tree
• 118. Pascal's Triangle
• 119. Pascal's Triangle II
• 120. Triangle
• 121. Best Time to Buy and Sell Stock
• 122. Best Time to Buy and Sell Stock II
• 123. Best Time to Buy and Sell Stock III
• 128. Longest Consecutive Sequence
• 130. Surrounded Regions
• 134. Gas Station
• 135. Candy
• 136. Single Number
• 137. Single Number II
• 139. Word Break
• 140. Word Break II
• 149. Max Points on a Line
• 150. Evaluate Reverse Polish Notation
• 152. Maximum Product Subarray
• 153. Find Minimum in Rotated Sorted Array
• 154. Find Minimum in Rotated Sorted Array II
• 157. Read N Characters Given Read4 🔒
• 158. Read N Characters Given read4 II - Call Multiple Times 🔒
• 162. Find Peak Element
• 163. Missing Ranges 🔒
• 164. Maximum Gap
• 167. Two Sum II - Input Array Is Sorted
• 169. Majority Element
• 170. Two Sum III - Data structure design 🔒
• 174. Dungeon Game
• 179. Largest Number
• 188. Best Time to Buy and Sell Stock IV
• 189. Rotate Array
• 198. House Robber
• 200. Number of Islands
• 204. Count Primes
• 209. Minimum Size Subarray Sum
• 212. Word Search II
• 213. House Robber II
• 215. Kth Largest Element in an Array
• 216. Combination Sum III
• 217. Contains Duplicate
• 218. The Skyline Problem
• 219. Contains Duplicate II
• 220. Contains Duplicate III
• 221. Maximal Square
• 228. Summary Ranges
• 229. Majority Element II
• 238. Product of Array Except Self
• 239. Sliding Window Maximum
• 240. Search a 2D Matrix II
• 243. Shortest Word Distance 🔒
• 244. Shortest Word Distance II 🔒
• 245. Shortest Word Distance III 🔒
• 247. Strobogrammatic Number II 🔒
• 248. Strobogrammatic Number III 🔒
• 249. Group Shifted Strings 🔒
• 251. Flatten 2D Vector 🔒
• 252. Meeting Rooms 🔒
• 253. Meeting Rooms II 🔒
• 255. Verify Preorder Sequence in Binary Search Tree 🔒
• 256. Paint House 🔒
• 259. 3Sum Smaller 🔒
• 260. Single Number III
• 265. Paint House II 🔒
• 268. Missing Number
• 269. Alien Dictionary 🔒
• 271. Encode and Decode Strings 🔒
• 274. H-Index
• 275. H-Index II
• 280. Wiggle Sort 🔒
• 281. Zigzag Iterator 🔒
• 283. Move Zeroes
• 284. Peeking Iterator
• 286. Walls and Gates 🔒
• 287. Find the Duplicate Number
• 288. Unique Word Abbreviation 🔒
• 289. Game of Life
• 296. Best Meeting Point 🔒
• 300. Longest Increasing Subsequence
• 302. Smallest Rectangle Enclosing Black Pixels 🔒
• 303. Range Sum Query - Immutable
• 304. Range Sum Query 2D - Immutable
• 305. Number of Islands II 🔒
• 307. Range Sum Query - Mutable
• 308. Range Sum Query 2D - Mutable 🔒
• 309. Best Time to Buy and Sell Stock with Cooldown
• 311. Sparse Matrix Multiplication 🔒
• 312. Burst Balloons
• 313. Super Ugly Number
• 315. Count of Smaller Numbers After Self
• 317. Shortest Distance from All Buildings 🔒
• 318. Maximum Product of Word Lengths
• 321. Create Maximum Number
• 322. Coin Change
• 324. Wiggle Sort II
• 325. Maximum Size Subarray Sum Equals k 🔒
• 327. Count of Range Sum
• 329. Longest Increasing Path in a Matrix
• 330. Patching Array
• 332. Reconstruct Itinerary
• 334. Increasing Triplet Subsequence
• 335. Self Crossing
• 336. Palindrome Pairs
• 346. Moving Average from Data Stream 🔒
• 347. Top K Frequent Elements
• 348. Design Tic-Tac-Toe 🔒
• 349. Intersection of Two Arrays
• 350. Intersection of Two Arrays II
• 353. Design Snake Game 🔒
• 354. Russian Doll Envelopes
• 356. Line Reflection 🔒
• 360. Sort Transformed Array 🔒
• 361. Bomb Enemy 🔒
• 362. Design Hit Counter 🔒
• 363. Max Sum of Rectangle No Larger Than K
• 368. Largest Divisible Subset
• 370. Range Addition 🔒
• 373. Find K Pairs with Smallest Sums
• 376. Wiggle Subsequence
• 377. Combination Sum IV
• 378. Kth Smallest Element in a Sorted Matrix
• 379. Design Phone Directory 🔒
• 380. Insert Delete GetRandom O(1)
• 381. Insert Delete GetRandom O(1) - Duplicates allowed
• 384. Shuffle an Array
• 391. Perfect Rectangle
• 393. UTF-8 Validation
• 396. Rotate Function
• 399. Evaluate Division
• 403. Frog Jump
• 406. Queue Reconstruction by Height
• 407. Trapping Rain Water II
• 410. Split Array Largest Sum
• 411. Minimum Unique Word Abbreviation 🔒
• 413. Arithmetic Slices
• 414. Third Maximum Number
• 416. Partition Equal Subset Sum
• 417. Pacific Atlantic Water Flow
• 418. Sentence Screen Fitting 🔒
• 419. Battleships in a Board
• 421. Maximum XOR of Two Numbers in an Array
• 422. Valid Word Square 🔒
• 425. Word Squares 🔒
• 427. Construct Quad Tree
• 435. Non-overlapping Intervals
• 436. Find Right Interval
• 442. Find All Duplicates in an Array
• 444. Sequence Reconstruction 🔒
• 446. Arithmetic Slices II - Subsequence
• 447. Number of Boomerangs
• 448. Find All Numbers Disappeared in an Array
• 452. Minimum Number of Arrows to Burst Balloons
• 453. Minimum Moves to Equal Array Elements
• 454. 4Sum II
• 455. Assign Cookies
• 456. 132 Pattern
• 457. Circular Array Loop
• 462. Minimum Moves to Equal Array Elements II
• 463. Island Perimeter
• 465. Optimal Account Balancing 🔒
• 469. Convex Polygon 🔒
• 472. Concatenated Words
• 473. Matchsticks to Square
• 474. Ones and Zeroes
• 475. Heaters
• 477. Total Hamming Distance
• 480. Sliding Window Median
• 484. Find Permutation 🔒
• 485. Max Consecutive Ones
• 486. Predict the Winner
• 487. Max Consecutive Ones II 🔒
• 490. The Maze 🔒
• 491. Non-decreasing Subsequences
• 493. Reverse Pairs
• 494. Target Sum
• 495. Teemo Attacking
• 496. Next Greater Element I
• 497. Random Point in Non-overlapping Rectangles
• 498. Diagonal Traverse
• 499. The Maze III 🔒
• 500. Keyboard Row
• 502. IPO
• 503. Next Greater Element II
• 505. The Maze II 🔒
• 506. Relative Ranks
• 517. Super Washing Machines
• 518. Coin Change II
• 522. Longest Uncommon Subsequence II
• 523. Continuous Subarray Sum
• 524. Longest Word in Dictionary through Deleting
• 525. Contiguous Array
• 526. Beautiful Arrangement
• 527. Word Abbreviation 🔒
• 528. Random Pick with Weight
• 529. Minesweeper
• 531. Lonely Pixel I 🔒
• 532. K-diff Pairs in an Array
• 533. Lonely Pixel II 🔒
• 539. Minimum Time Difference
• 540. Single Element in a Sorted Array
• 542. 1 Matrix
• 546. Remove Boxes
• 548. Split Array with Equal Sum 🔒
• 553. Optimal Division
• 554. Brick Wall
• 555. Split Concatenated Strings 🔒
• 560. Subarray Sum Equals K
• 561. Array Partition
• 562. Longest Line of Consecutive One in Matrix 🔒
• 565. Array Nesting
• 566. Reshape the Matrix
• 568. Maximum Vacation Days 🔒
• 573. Squirrel Simulation 🔒
• 575. Distribute Candies
• 581. Shortest Unsorted Continuous Subarray
• 582. Kill Process 🔒
• 587. Erect the Fence
• 594. Longest Harmonious Subsequence
• 598. Range Addition II
• 599. Minimum Index Sum of Two Lists
• 604. Design Compressed String Iterator 🔒
• 605. Can Place Flowers
• 609. Find Duplicate File in System
• 611. Valid Triangle Number
• 616. Add Bold Tag in String 🔒
• 621. Task Scheduler
• 622. Design Circular Queue
• 624. Maximum Distance in Arrays
• 628. Maximum Product of Three Numbers
• 630. Course Schedule III
• 631. Design Excel Sum Formula 🔒
• 632. Smallest Range Covering Elements from K Lists
• 636. Exclusive Time of Functions
• 638. Shopping Offers
• 641. Design Circular Deque
• 643. Maximum Average Subarray I
• 644. Maximum Average Subarray II 🔒
• 645. Set Mismatch
• 646. Maximum Length of Pair Chain
• 648. Replace Words
• 654. Maximum Binary Tree
• 656. Coin Path 🔒
• 658. Find K Closest Elements
• 659. Split Array into Consecutive Subsequences
• 661. Image Smoother
• 665. Non-decreasing Array
• 666. Path Sum IV 🔒
• 667. Beautiful Arrangement II
• 673. Number of Longest Increasing Subsequence
• 674. Longest Continuous Increasing Subsequence
• 675. Cut Off Trees for Golf Event
• 679. 24 Game
• 682. Baseball Game
• 683. K Empty Slots 🔒
• 689. Maximum Sum of 3 Non-Overlapping Subarrays
• 690. Employee Importance
• 691. Stickers to Spell Word
• 692. Top K Frequent Words
• 694. Number of Distinct Islands 🔒
• 695. Max Area of Island
• 697. Degree of an Array
• 698. Partition to K Equal Sum Subsets
• 699. Falling Squares
• 702. Search in a Sorted Array of Unknown Size 🔒
• 704. Binary Search
• 705. Design HashSet
• 706. Design HashMap
• 710. Random Pick with Blacklist
• 711. Number of Distinct Islands II 🔒
• 713. Subarray Product Less Than K
• 714. Best Time to Buy and Sell Stock with Transaction Fee
• 717. 1-bit and 2-bit Characters
• 718. Maximum Length of Repeated Subarray
• 719. Find K-th Smallest Pair Distance
• 720. Longest Word in Dictionary
• 721. Accounts Merge
• 722. Remove Comments
• 723. Candy Crush 🔒
• 724. Find Pivot Index
• 729. My Calendar I
• 731. My Calendar II
• 733. Flood Fill
• 734. Sentence Similarity 🔒
• 735. Asteroid Collision
• 737. Sentence Similarity II 🔒
• 739. Daily Temperatures
• 740. Delete and Earn
• 741. Cherry Pickup
• 744. Find Smallest Letter Greater Than Target
• 745. Prefix and Suffix Search
• 746. Min Cost Climbing Stairs
• 747. Largest Number At Least Twice of Others
• 748. Shortest Completing Word
• 749. Contain Virus
• 750. Number Of Corner Rectangles 🔒
• 752. Open the Lock
• 755. Pour Water 🔒
• 757. Set Intersection Size At Least Two
• 758. Bold Words in String 🔒
• 759. Employee Free Time 🔒
• 760. Find Anagram Mappings 🔒
• 764. Largest Plus Sign
• 766. Toeplitz Matrix
• 768. Max Chunks To Make Sorted II
• 769. Max Chunks To Make Sorted
• 773. Sliding Puzzle
• 774. Minimize Max Distance to Gas Station 🔒
• 775. Global and Local Inversions
• 778. Swim in Rising Water
• 781. Rabbits in Forest
• 782. Transform to Chessboard
• 786. K-th Smallest Prime Fraction
• 789. Escape The Ghosts
• 792. Number of Matching Subsequences
• 794. Valid Tic-Tac-Toe State
• 795. Number of Subarrays with Bounded Maximum
• 798. Smallest Rotation with Highest Score
• 801. Minimum Swaps To Make Sequences Increasing
• 803. Bricks Falling When Hit
• 804. Unique Morse Code Words
• 805. Split Array With Same Average
• 806. Number of Lines To Write String
• 807. Max Increase to Keep City Skyline
• 809. Expressive Words
• 810. Chalkboard XOR Game
• 811. Subdomain Visit Count
• 812. Largest Triangle Area
• 813. Largest Sum of Averages
• 815. Bus Routes
• 817. Linked List Components
• 819. Most Common Word
• 820. Short Encoding of Words
• 821. Shortest Distance to a Character
• 822. Card Flipping Game
• 823. Binary Trees With Factors
• 825. Friends Of Appropriate Ages
• 826. Most Profit Assigning Work
• 827. Making A Large Island
• 832. Flipping an Image
• 833. Find And Replace in String
• 835. Image Overlap
• 839. Similar String Groups
• 840. Magic Squares In Grid
• 843. Guess the Word
• 845. Longest Mountain in Array
• 846. Hand of Straights
• 848. Shifting Letters
• 849. Maximize Distance to Closest Person
• 850. Rectangle Area II
• 851. Loud and Rich
• 852. Peak Index in a Mountain Array
• 853. Car Fleet
• 857. Minimum Cost to Hire K Workers
• 860. Lemonade Change
• 861. Score After Flipping Matrix
• 862. Shortest Subarray with Sum at Least K
• 864. Shortest Path to Get All Keys
• 867. Transpose Matrix
• 870. Advantage Shuffle
• 871. Minimum Number of Refueling Stops
• 873. Length of Longest Fibonacci Subsequence
• 874. Walking Robot Simulation
• 875. Koko Eating Bananas
• 877. Stone Game
• 879. Profitable Schemes
• 881. Boats to Save People
• 883. Projection Area of 3D Shapes
• 885. Spiral Matrix III
• 888. Fair Candy Swap
• 889. Construct Binary Tree from Preorder and Postorder Traversal
• 890. Find and Replace Pattern
• 891. Sum of Subsequence Widths
• 892. Surface Area of 3D Shapes
• 893. Groups of Special-Equivalent Strings
• 896. Monotonic Array
• 898. Bitwise ORs of Subarrays
• 900. RLE Iterator
• 902. Numbers At Most N Given Digit Set
• 904. Fruit Into Baskets
• 905. Sort Array By Parity
• 907. Sum of Subarray Minimums
• 908. Smallest Range I
• 909. Snakes and Ladders
• 910. Smallest Range II
• 911. Online Election
• 912. Sort an Array
• 914. X of a Kind in a Deck of Cards
• 915. Partition Array into Disjoint Intervals
• 916. Word Subsets
• 918. Maximum Sum Circular Subarray
• 922. Sort Array By Parity II
• 923. 3Sum With Multiplicity
• 924. Minimize Malware Spread
• 927. Three Equal Parts
• 928. Minimize Malware Spread II
• 929. Unique Email Addresses
• 930. Binary Subarrays With Sum
• 931. Minimum Falling Path Sum
• 932. Beautiful Array
• 934. Shortest Bridge
• 937. Reorder Data in Log Files
• 939. Minimum Area Rectangle
• 941. Valid Mountain Array
• 942. DI String Match
• 943. Find the Shortest Superstring
• 944. Delete Columns to Make Sorted
• 945. Minimum Increment to Make Array Unique
• 946. Validate Stack Sequences
• 948. Bag of Tokens
• 949. Largest Time for Given Digits
• 950. Reveal Cards In Increasing Order
• 952. Largest Component Size by Common Factor
• 953. Verifying an Alien Dictionary
• 954. Array of Doubled Pairs
• 955. Delete Columns to Make Sorted II
• 956. Tallest Billboard
• 957. Prison Cells After N Days
• 959. Regions Cut By Slashes
• 960. Delete Columns to Make Sorted III
• 961. N-Repeated Element in Size 2N Array
• 962. Maximum Width Ramp
• 963. Minimum Area Rectangle II
• 966. Vowel Spellchecker
• 969. Pancake Sorting
• 973. K Closest Points to Origin
• 974. Subarray Sums Divisible by K
• 975. Odd Even Jump
• 976. Largest Perimeter Triangle
• 977. Squares of a Sorted Array
• 978. Longest Turbulent Subarray
• 980. Unique Paths III
• 982. Triples with Bitwise AND Equal To Zero
• 983. Minimum Cost For Tickets
• 985. Sum of Even Numbers After Queries
• 986. Interval List Intersections
• 989. Add to Array-Form of Integer
• 990. Satisfiability of Equality Equations
• 992. Subarrays with K Different Integers
• 994. Rotting Oranges
• 995. Minimum Number of K Consecutive Bit Flips
• 996. Number of Squareful Arrays
• 997. Find the Town Judge
• 999. Available Captures for Rook
• 1000. Minimum Cost to Merge Stones
• 1001. Grid Illumination
• 1002. Find Common Characters
• 1004. Max Consecutive Ones III
• 1005. Maximize Sum Of Array After K Negations
• 1007. Minimum Domino Rotations For Equal Row
• 1008. Construct Binary Search Tree from Preorder Traversal
• 1010. Pairs of Songs With Total Durations Divisible by 60
• 1011. Capacity To Ship Packages Within D Days
• 1013. Partition Array Into Three Parts With Equal Sum
• 1014. Best Sightseeing Pair
• 1018. Binary Prefix Divisible By 5
• 1019. Next Greater Node In Linked List
• 1020. Number of Enclaves
• 1023. Camelcase Matching
• 1024. Video Stitching
• 1027. Longest Arithmetic Subsequence
• 1029. Two City Scheduling
• 1030. Matrix Cells in Distance Order
• 1031. Maximum Sum of Two Non-Overlapping Subarrays
• 1032. Stream of Characters
• 1034. Coloring A Border
• 1035. Uncrossed Lines
• 1036. Escape a Large Maze
• 1037. Valid Boomerang
• 1039. Minimum Score Triangulation of Polygon
• 1040. Moving Stones Until Consecutive II
• 1043. Partition Array for Maximum Sum
• 1046. Last Stone Weight
• 1048. Longest String Chain
• 1049. Last Stone Weight II
• 1051. Height Checker
• 1052. Grumpy Bookstore Owner
• 1053. Previous Permutation With One Swap
• 1054. Distant Barcodes
• 1057. Campus Bikes 🔒
• 1058. Minimize Rounding Error to Meet Target 🔒
• 1060. Missing Element in Sorted Array 🔒
• 1063. Number of Valid Subarrays 🔒
• 1064. Fixed Point 🔒
• 1065. Index Pairs of a String 🔒
• 1066. Campus Bikes II 🔒
• 1072. Flip Columns For Maximum Number of Equal Rows
• 1073. Adding Two Negabinary Numbers
• 1074. Number of Submatrices That Sum to Target
• 1085. Sum of Digits in the Minimum Number 🔒
• 1086. High Five 🔒
• 1089. Duplicate Zeros
• 1090. Largest Values From Labels
• 1091. Shortest Path in Binary Matrix
• 1093. Statistics from a Large Sample
• 1094. Car Pooling
• 1095. Find in Mountain Array
• 1099. Two Sum Less Than K 🔒
• 1101. The Earliest Moment When Everyone Become Friends 🔒
• 1102. Path With Maximum Minimum Value 🔒
• 1105. Filling Bookcase Shelves
• 1109. Corporate Flight Bookings
• 1110. Delete Nodes And Return Forest
• 1121. Divide Array Into Increasing Sequences 🔒
• 1122. Relative Sort Array
• 1124. Longest Well-Performing Interval
• 1125. Smallest Sufficient Team
• 1128. Number of Equivalent Domino Pairs
• 1130. Minimum Cost Tree From Leaf Values
• 1131. Maximum of Absolute Value Expression
• 1133. Largest Unique Number 🔒
• 1139. Largest 1-Bordered Square
• 1140. Stone Game II
• 1144. Decrease Elements To Make Array Zigzag
• 1146. Snapshot Array
• 1150. Check If a Number Is Majority Element in a Sorted Array 🔒
• 1151. Minimum Swaps to Group All 1's Together 🔒
• 1152. Analyze User Website Visit Pattern 🔒
• 1157. Online Majority Element In Subarray
• 1160. Find Words That Can Be Formed by Characters
• 1162. As Far from Land as Possible
• 1167. Minimum Cost to Connect Sticks 🔒
• 1169. Invalid Transactions
• 1170. Compare Strings by Frequency of the Smallest Character
• 1176. Diet Plan Performance 🔒
• 1177. Can Make Palindrome from Substring
• 1178. Number of Valid Words for Each Puzzle
• 1181. Before and After Puzzle 🔒
• 1182. Shortest Distance to Target Color 🔒
• 1184. Distance Between Bus Stops
• 1186. Maximum Subarray Sum with One Deletion
• 1187. Make Array Strictly Increasing
• 1191. K-Concatenation Maximum Sum
• 1196. How Many Apples Can You Put into the Basket 🔒
• 1198. Find Smallest Common Element in All Rows 🔒
• 1199. Minimum Time to Build Blocks 🔒
• 1200. Minimum Absolute Difference
• 1202. Smallest String With Swaps
• 1207. Unique Number of Occurrences
• 1210. Minimum Moves to Reach Target with Rotations
• 1213. Intersection of Three Sorted Arrays 🔒
• 1217. Minimum Cost to Move Chips to The Same Position
• 1218. Longest Arithmetic Subsequence of Given Difference
• 1219. Path with Maximum Gold
• 1222. Queens That Can Attack the King
• 1223. Dice Roll Simulation
• 1224. Maximum Equal Frequency
• 1228. Missing Number In Arithmetic Progression 🔒
• 1229. Meeting Scheduler 🔒
• 1230. Toss Strange Coins 🔒
• 1231. Divide Chocolate 🔒
• 1232. Check If It Is a Straight Line
• 1233. Remove Sub-Folders from the Filesystem
• 1235. Maximum Profit in Job Scheduling
• 1239. Maximum Length of a Concatenated String with Unique Characters
• 1243. Array Transformation 🔒
• 1246. Palindrome Removal 🔒
• 1248. Count Number of Nice Subarrays
• 1250. Check If It Is a Good Array
• 1252. Cells with Odd Values in a Matrix
• 1253. Reconstruct a 2-Row Binary Matrix
• 1254. Number of Closed Islands
• 1255. Maximum Score Words Formed by Letters
• 1257. Smallest Common Region 🔒
• 1258. Synonymous Sentences 🔒
• 1260. Shift 2D Grid
• 1262. Greatest Sum Divisible by Three
• 1263. Minimum Moves to Move a Box to Their Target Location
• 1266. Minimum Time Visiting All Points
• 1267. Count Servers that Communicate
• 1268. Search Suggestions System
• 1272. Remove Interval 🔒
• 1273. Delete Tree Nodes 🔒
• 1274. Number of Ships in a Rectangle 🔒
• 1275. Find Winner on a Tic Tac Toe Game
• 1277. Count Square Submatrices with All Ones
• 1282. Group the People Given the Group Size They Belong To
• 1283. Find the Smallest Divisor Given a Threshold
• 1284. Minimum Number of Flips to Convert Binary Matrix to Zero Matrix
• 1287. Element Appearing More Than 25% In Sorted Array
• 1288. Remove Covered Intervals
• 1289. Minimum Falling Path Sum II
• 1292. Maximum Side Length of a Square with Sum Less than or Equal to Threshold
• 1293. Shortest Path in a Grid with Obstacles Elimination
• 1295. Find Numbers with Even Number of Digits
• 1296. Divide Array in Sets of K Consecutive Numbers
• 1298. Maximum Candies You Can Get from Boxes
• 1299. Replace Elements with Greatest Element on Right Side
• 1300. Sum of Mutated Array Closest to Target
• 1301. Number of Paths with Max Score
• 1304. Find N Unique Integers Sum up to Zero
• 1306. Jump Game III
• 1307. Verbal Arithmetic Puzzle
• 1310. XOR Queries of a Subarray
• 1311. Get Watched Videos by Your Friends
• 1313. Decompress Run-Length Encoded List
• 1314. Matrix Block Sum
• 1324. Print Words Vertically
• 1326. Minimum Number of Taps to Open to Water a Garden
• 1329. Sort the Matrix Diagonally
• 1330. Reverse Subarray To Maximize Array Value
• 1331. Rank Transform of an Array
• 1333. Filter Restaurants by Vegan-Friendly, Price and Distance
• 1335. Minimum Difficulty of a Job Schedule
• 1337. The K Weakest Rows in a Matrix
• 1338. Reduce Array Size to The Half
• 1340. Jump Game V
• 1343. Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold
• 1345. Jump Game IV
• 1346. Check If N and Its Double Exist
• 1349. Maximum Students Taking Exam
• 1351. Count Negative Numbers in a Sorted Matrix
• 1352. Product of the Last K Numbers
• 1353. Maximum Number of Events That Can Be Attended
• 1354. Construct Target Array With Multiple Sums
• 1356. Sort Integers by The Number of 1 Bits
• 1357. Apply Discount Every n Orders
• 1363. Largest Multiple of Three
• 1365. How Many Numbers Are Smaller Than the Current Number
• 1366. Rank Teams by Votes
• 1368. Minimum Cost to Make at Least One Valid Path in a Grid
• 1375. Number of Times Binary String Is Prefix-Aligned
• 1380. Lucky Numbers in a Matrix
• 1381. Design a Stack With Increment Operation
• 1383. Maximum Performance of a Team
• 1385. Find the Distance Value Between Two Arrays
• 1386. Cinema Seat Allocation
• 1388. Pizza With 3n Slices
• 1389. Create Target Array in the Given Order
• 1390. Four Divisors
• 1391. Check if There is a Valid Path in a Grid
• 1394. Find Lucky Integer in an Array
• 1395. Count Number of Teams
• 1402. Reducing Dishes
• 1403. Minimum Subsequence in Non-Increasing Order
• 1406. Stone Game III
• 1408. String Matching in an Array
• 1409. Queries on a Permutation With Key
• 1413. Minimum Value to Get Positive Step by Step Sum
• 1418. Display Table of Food Orders in a Restaurant
• 1423. Maximum Points You Can Obtain from Cards
• 1424. Diagonal Traverse II
• 1425. Constrained Subsequence Sum
• 1426. Counting Elements 🔒
• 1427. Perform String Shifts 🔒
• 1428. Leftmost Column with at Least a One 🔒
• 1429. First Unique Number 🔒
• 1431. Kids With the Greatest Number of Candies
• 1434. Number of Ways to Wear Different Hats to Each Other
• 1436. Destination City
• 1437. Check If All 1's Are at Least Length K Places Away
• 1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
• 1439. Find the Kth Smallest Sum of a Matrix With Sorted Rows
• 1441. Build an Array With Stack Operations
• 1442. Count Triplets That Can Form Two Arrays of Equal XOR
• 1444. Number of Ways of Cutting a Pizza
• 1449. Form Largest Integer With Digits That Add up to Target
• 1450. Number of Students Doing Homework at a Given Time
• 1452. People Whose List of Favorite Companies Is Not a Subset of Another List
• 1453. Maximum Number of Darts Inside of a Circular Dartboard
• 1458. Max Dot Product of Two Subsequences
• 1460. Make Two Arrays Equal by Reversing Subarrays
• 1463. Cherry Pickup II
• 1464. Maximum Product of Two Elements in an Array
• 1465. Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts
• 1467. Probability of a Two Boxes Having The Same Number of Distinct Balls
• 1470. Shuffle the Array
• 1471. The k Strongest Values in an Array
• 1472. Design Browser History
• 1473. Paint House III
• 1475. Final Prices With a Special Discount in a Shop
• 1476. Subrectangle Queries
• 1477. Find Two Non-overlapping Sub-arrays Each With Target Sum
• 1478. Allocate Mailboxes
• 1480. Running Sum of 1d Array
• 1481. Least Number of Unique Integers after K Removals
• 1482. Minimum Number of Days to Make m Bouquets
• 1487. Making File Names Unique
• 1488. Avoid Flood in The City
• 1491. Average Salary Excluding the Minimum and Maximum Salary
• 1493. Longest Subarray of 1's After Deleting One Element
• 1497. Check If Array Pairs Are Divisible by k
• 1498. Number of Subsequences That Satisfy the Given Sum Condition
• 1499. Max Value of Equation
• 1502. Can Make Arithmetic Progression From Sequence
• 1503. Last Moment Before All Ants Fall Out of a Plank
• 1504. Count Submatrices With All Ones
• 1508. Range Sum of Sorted Subarray Sums
• 1509. Minimum Difference Between Largest and Smallest Value in Three Moves
• 1512. Number of Good Pairs
• 1514. Path with Maximum Probability
• 1515. Best Position for a Service Centre
• 1521. Find a Value of a Mysterious Function Closest to Target
• 1524. Number of Sub-arrays With Odd Sum
• 1526. Minimum Number of Increments on Subarrays to Form a Target Array
• 1528. Shuffle String
• 1533. Find the Index of the Large Integer 🔒
• 1534. Count Good Triplets
• 1535. Find the Winner of an Array Game
• 1536. Minimum Swaps to Arrange a Binary Grid
• 1537. Get the Maximum Score
• 1538. Guess the Majority in a Hidden Array 🔒
• 1539. Kth Missing Positive Number
• 1546. Maximum Number of Non-Overlapping Subarrays With Sum Equals Target
• 1547. Minimum Cost to Cut a Stick
• 1548. The Most Similar Path in a Graph 🔒
• 1550. Three Consecutive Odds
• 1552. Magnetic Force Between Two Balls
• 1558. Minimum Numbers of Function Calls to Make Target Array
• 1559. Detect Cycles in 2D Grid
• 1560. Most Visited Sector in a Circular Track
• 1561. Maximum Number of Coins You Can Get
• 1562. Find Latest Group of Size M
• 1563. Stone Game V
• 1564. Put Boxes Into the Warehouse I 🔒
• 1566. Detect Pattern of Length M Repeated K or More Times
• 1567. Maximum Length of Subarray With Positive Product
• 1568. Minimum Number of Days to Disconnect Island
• 1569. Number of Ways to Reorder Array to Get Same BST
• 1570. Dot Product of Two Sparse Vectors 🔒
• 1572. Matrix Diagonal Sum
• 1574. Shortest Subarray to be Removed to Make Array Sorted
• 1575. Count All Possible Routes
• 1577. Number of Ways Where Square of Number Is Equal to Product of Two Numbers
• 1578. Minimum Time to Make Rope Colorful
• 1580. Put Boxes Into the Warehouse II 🔒
• 1582. Special Positions in a Binary Matrix
• 1583. Count Unhappy Friends
• 1584. Min Cost to Connect All Points
• 1588. Sum of All Odd Length Subarrays
• 1589. Maximum Sum Obtained of Any Permutation
• 1590. Make Sum Divisible by P
• 1591. Strange Printer II
• 1594. Maximum Non Negative Product in a Matrix
• 1595. Minimum Cost to Connect Two Groups of Points
• 1598. Crawler Log Folder
• 1599. Maximum Profit of Operating a Centennial Wheel
• 1601. Maximum Number of Achievable Transfer Requests
• 1604. Alert Using Same Key-Card Three or More Times in a One Hour Period
• 1605. Find Valid Matrix Given Row and Column Sums
• 1606. Find Servers That Handled Most Number of Requests
• 1608. Special Array With X Elements Greater Than or Equal X
• 1610. Maximum Number of Visible Points
• 1618. Maximum Font to Fit a Sentence in a Screen 🔒
• 1619. Mean of Array After Removing Some Elements
• 1620. Coordinate With Maximum Network Quality
• 1626. Best Team With No Conflicts
• 1627. Graph Connectivity With Threshold
• 1628. Design an Expression Tree With Evaluate Function 🔒
• 1629. Slowest Key
• 1630. Arithmetic Subarrays
• 1631. Path With Minimum Effort
• 1632. Rank Transform of a Matrix
• 1636. Sort Array by Increasing Frequency
• 1637. Widest Vertical Area Between Two Points Containing No Points
• 1639. Number of Ways to Form a Target String Given a Dictionary
• 1640. Check Array Formation Through Concatenation
• 1642. Furthest Building You Can Reach
• 1643. Kth Smallest Instructions
• 1646. Get Maximum in Generated Array
• 1648. Sell Diminishing-Valued Colored Balls
• 1649. Create Sorted Array through Instructions
• 1652. Defuse the Bomb
• 1654. Minimum Jumps to Reach Home
• 1655. Distribute Repeating Integers
• 1656. Design an Ordered Stream
• 1658. Minimum Operations to Reduce X to Zero
• 1662. Check If Two String Arrays are Equivalent
• 1664. Ways to Make a Fair Array
• 1665. Minimum Initial Energy to Finish Tasks
• 1670. Design Front Middle Back Queue
• 1671. Minimum Number of Removals to Make Mountain Array
• 1672. Richest Customer Wealth
• 1673. Find the Most Competitive Subsequence
• 1674. Minimum Moves to Make Array Complementary
• 1675. Minimize Deviation in Array
• 1679. Max Number of K-Sum Pairs
• 1681. Minimum Incompatibility
• 1684. Count the Number of Consistent Strings
• 1685. Sum of Absolute Differences in a Sorted Array
• 1686. Stone Game VI
• 1687. Delivering Boxes from Storage to Ports
• 1690. Stone Game VII
• 1691. Maximum Height by Stacking Cuboids
• 1695. Maximum Erasure Value
• 1696. Jump Game VI
• 1697. Checking Existence of Edge Length Limited Paths
• 1700. Number of Students Unable to Eat Lunch
• 1701. Average Waiting Time
• 1703. Minimum Adjacent Swaps for K Consecutive Ones
• 1705. Maximum Number of Eaten Apples
• 1706. Where Will the Ball Fall
• 1707. Maximum XOR With an Element From Array
• 1708. Largest Subarray Length K 🔒
• 1710. Maximum Units on a Truck
• 1711. Count Good Meals
• 1712. Ways to Split Array Into Three Subarrays
• 1713. Minimum Operations to Make a Subsequence
• 1714. Sum Of Special Evenly-Spaced Elements In Array 🔒
• 1718. Construct the Lexicographically Largest Valid Sequence
• 1719. Number Of Ways To Reconstruct A Tree
• 1720. Decode XORed Array
• 1722. Minimize Hamming Distance After Swap Operations
• 1723. Find Minimum Time to Finish All Jobs
• 1725. Number Of Rectangles That Can Form The Largest Square
• 1726. Tuple with Same Product
• 1727. Largest Submatrix With Rearrangements
• 1728. Cat and Mouse II
• 1730. Shortest Path to Get Food 🔒
• 1732. Find the Highest Altitude
• 1733. Minimum Number of People to Teach
• 1734. Decode XORed Permutation
• 1735. Count Ways to Make Array With Product
• 1738. Find Kth Largest XOR Coordinate Value
• 1743. Restore the Array From Adjacent Pairs
• 1744. Can You Eat Your Favorite Candy on Your Favorite Day
• 1746. Maximum Subarray Sum After One Operation 🔒
• 1748. Sum of Unique Elements
• 1749. Maximum Absolute Sum of Any Subarray
• 1751. Maximum Number of Events That Can Be Attended II
• 1752. Check if Array Is Sorted and Rotated
• 1755. Closest Subsequence Sum
• 1756. Design Most Recently Used Queue 🔒
• 1760. Minimum Limit of Balls in a Bag
• 1762. Buildings With an Ocean View 🔒
• 1764. Form Array by Concatenating Subarrays of Another Array
• 1765. Map of Highest Peak
• 1766. Tree of Coprimes
• 1769. Minimum Number of Operations to Move All Balls to Each Box
• 1770. Maximum Score from Performing Multiplication Operations
• 1772. Sort Features by Popularity 🔒
• 1773. Count Items Matching a Rule
• 1774. Closest Dessert Cost
• 1775. Equal Sum Arrays With Minimum Number of Operations
• 1776. Car Fleet II
• 1778. Shortest Path in a Hidden Grid 🔒
• 1779. Find Nearest Point That Has the Same X or Y Coordinate
• 1782. Count Pairs Of Nodes
• 1785. Minimum Elements to Add to Form a Given Sum
• 1787. Make the XOR of All Segments Equal to Zero
• 1788. Maximize the Beauty of the Garden 🔒
• 1792. Maximum Average Pass Ratio
• 1793. Maximum Score of a Good Subarray
• 1798. Maximum Number of Consecutive Values You Can Make
• 1799. Maximize Score After N Operations
• 1800. Maximum Ascending Subarray Sum
• 1801. Number of Orders in the Backlog
• 1803. Count Pairs With XOR in a Range
• 1806. Minimum Number of Operations to Reinitialize a Permutation
• 1807. Evaluate the Bracket Pairs of a String
• 1810. Minimum Path Cost in a Hidden Grid 🔒
• 1813. Sentence Similarity III
• 1814. Count Nice Pairs in an Array
• 1815. Maximum Number of Groups Getting Fresh Donuts
• 1816. Truncate Sentence
• 1817. Finding the Users Active Minutes
• 1818. Minimum Absolute Sum Difference
• 1819. Number of Different Subsequences GCDs
• 1820. Maximum Number of Accepted Invitations 🔒
• 1822. Sign of the Product of an Array
• 1823. Find the Winner of the Circular Game
• 1824. Minimum Sideway Jumps
• 1826. Faulty Sensor 🔒
• 1827. Minimum Operations to Make the Array Increasing
• 1828. Queries on Number of Points Inside a Circle
• 1829. Maximum XOR for Each Query
• 1833. Maximum Ice Cream Bars
• 1834. Single-Threaded CPU
• 1835. Find XOR Sum of All Pairs Bitwise AND
• 1838. Frequency of the Most Frequent Element
• 1840. Maximum Building Height
• 1846. Maximum Element After Decreasing and Rearranging
• 1847. Closest Room
• 1848. Minimum Distance to the Target Element
• 1851. Minimum Interval to Include Each Query
• 1852. Distinct Numbers in Each Subarray 🔒
• 1854. Maximum Population Year
• 1855. Maximum Distance Between a Pair of Values
• 1856. Maximum Subarray Min-Product
• 1858. Longest Word With All Prefixes 🔒
• 1861. Rotating the Box
• 1862. Sum of Floored Pairs
• 1863. Sum of All Subset XOR Totals
• 1865. Finding Pairs With a Certain Sum
• 1868. Product of Two Run-Length Encoded Arrays 🔒
• 1870. Minimum Speed to Arrive on Time
• 1872. Stone Game VIII
• 1874. Minimize Product Sum of Two Arrays 🔒
• 1877. Minimize Maximum Pair Sum in Array
• 1878. Get Biggest Three Rhombus Sums in a Grid
• 1879. Minimum XOR Sum of Two Arrays
• 1882. Process Tasks Using Servers
• 1883. Minimum Skips to Arrive at Meeting On Time
• 1885. Count Pairs in Two Arrays 🔒
• 1886. Determine Whether Matrix Can Be Obtained By Rotation
• 1887. Reduction Operations to Make the Array Elements Equal
• 1889. Minimum Space Wasted From Packaging
• 1891. Cutting Ribbons 🔒
• 1893. Check if All the Integers in a Range Are Covered
• 1894. Find the Student that Will Replace the Chalk
• 1895. Largest Magic Square
• 1898. Maximum Number of Removable Characters
• 1899. Merge Triplets to Form Target Triplet
• 1901. Find a Peak Element II
• 1902. Depth of BST Given Insertion Order 🔒
• 1905. Count Sub Islands
• 1906. Minimum Absolute Difference Queries
• 1908. Game of Nim 🔒
• 1909. Remove One Element to Make the Array Strictly Increasing
• 1911. Maximum Alternating Subsequence Sum
• 1912. Design Movie Rental System
• 1913. Maximum Product Difference Between Two Pairs
• 1914. Cyclically Rotating a Grid
• 1916. Count Ways to Build Rooms in an Ant Colony
• 1918. Kth Smallest Subarray Sum 🔒
• 1920. Build Array from Permutation
• 1921. Eliminate Maximum Number of Monsters
• 1923. Longest Common Subpath
• 1924. Erect the Fence II 🔒
• 1926. Nearest Exit from Entrance in Maze
• 1928. Minimum Cost to Reach Destination in Time
• 1929. Concatenation of Array
• 1932. Merge BSTs to Create Single BST
• 1936. Add Minimum Number of Rungs
• 1937. Maximum Number of Points with Cost
• 1938. Maximum Genetic Difference Query
• 1940. Longest Common Subsequence Between Sorted Arrays 🔒
• 1942. The Number of the Smallest Unoccupied Chair
• 1943. Describe the Painting
• 1944. Number of Visible People in a Queue
• 1946. Largest Number After Mutating Substring
• 1947. Maximum Compatibility Score Sum
• 1948. Delete Duplicate Folders in System
• 1950. Maximum of Minimum Values in All Subarrays 🔒
• 1953. Maximum Number of Weeks for Which You Can Work
• 1955. Count Number of Special Subsequences
• 1956. Minimum Time For K Virus Variants to Spread 🔒
• 1958. Check if Move is Legal
• 1959. Minimum Total Space Wasted With K Resizing Operations
• 1961. Check If String Is a Prefix of Array
• 1962. Remove Stones to Minimize the Total
• 1964. Find the Longest Valid Obstacle Course at Each Position
• 1966. Binary Searchable Numbers in an Unsorted Array 🔒
• 1967. Number of Strings That Appear as Substrings in Word
• 1968. Array With Elements Not Equal to Average of Neighbors
• 1970. Last Day Where You Can Still Cross
• 1975. Maximum Matrix Sum
• 1979. Find Greatest Common Divisor of Array
• 1980. Find Unique Binary String
• 1981. Minimize the Difference Between Target and Chosen Elements
• 1982. Find Array Given Subset Sums
• 1983. Widest Pair of Indices With Equal Range Sum 🔒
• 1984. Minimum Difference Between Highest and Lowest of K Scores
• 1985. Find the Kth Largest Integer in the Array
• 1986. Minimum Number of Work Sessions to Finish the Tasks
• 1989. Maximum Number of People That Can Be Caught in Tag 🔒
• 1991. Find the Middle Index in Array
• 1992. Find All Groups of Farmland
• 1993. Operations on Tree
• 1994. The Number of Good Subsets
• 1995. Count Special Quadruplets
• 1996. The Number of Weak Characters in the Game
• 1997. First Day Where You Have Been in All the Rooms
• 1998. GCD Sort of an Array
• 2001. Number of Pairs of Interchangeable Rectangles
• 2003. Smallest Missing Genetic Value in Each Subtree
• 2006. Count Number of Pairs With Absolute Difference K
• 2007. Find Original Array From Doubled Array
• 2008. Maximum Earnings From Taxi
• 2009. Minimum Number of Operations to Make Array Continuous
• 2011. Final Value of Variable After Performing Operations
• 2012. Sum of Beauty in the Array
• 2013. Detect Squares
• 2015. Average Height of Buildings in Each Segment 🔒
• 2016. Maximum Difference Between Increasing Elements
• 2017. Grid Game
• 2018. Check if Word Can Be Placed In Crossword
• 2019. The Score of Students Solving Math Expression
• 2021. Brightest Position on Street 🔒
• 2022. Convert 1D Array Into 2D Array
• 2023. Number of Pairs of Strings With Concatenation Equal to Target
• 2025. Maximum Number of Ways to Partition an Array
• 2028. Find Missing Observations
• 2029. Stone Game IX
• 2031. Count Subarrays With More Ones Than Zeros 🔒
• 2032. Two Out of Three
• 2033. Minimum Operations to Make a Uni-Value Grid
• 2035. Partition Array Into Two Arrays to Minimize Sum Difference
• 2036. Maximum Alternating Subarray Sum 🔒
• 2037. Minimum Number of Moves to Seat Everyone
• 2039. The Time When the Network Becomes Idle
• 2040. Kth Smallest Product of Two Sorted Arrays
• 2043. Simple Bank System
• 2044. Count Number of Maximum Bitwise-OR Subsets
• 2049. Count Nodes With the Highest Score
• 2050. Parallel Courses III
• 2053. Kth Distinct String in an Array
• 2054. Two Best Non-Overlapping Events
• 2055. Plates Between Candles
• 2056. Number of Valid Move Combinations On Chessboard
• 2057. Smallest Index With Equal Value
• 2059. Minimum Operations to Convert Number
• 2061. Number of Spaces Cleaning Robot Cleaned 🔒
• 2064. Minimized Maximum of Products Distributed to Any Store
• 2065. Maximum Path Quality of a Graph
• 2070. Most Beautiful Item for Each Query
• 2071. Maximum Number of Tasks You Can Assign
• 2073. Time Needed to Buy Tickets
• 2078. Two Furthest Houses With Different Colors
• 2079. Watering Plants
• 2080. Range Frequency Queries
• 2085. Count Common Words With One Occurrence
• 2087. Minimum Cost Homecoming of a Robot in a Grid
• 2088. Count Fertile Pyramids in a Land
• 2089. Find Target Indices After Sorting Array
• 2090. K Radius Subarray Averages
• 2091. Removing Minimum and Maximum From Array
• 2094. Finding 3-Digit Even Numbers
• 2097. Valid Arrangement of Pairs
• 2098. Subsequence of Size K With the Largest Even Sum 🔒
• 2099. Find Subsequence of Length K With the Largest Sum
• 2100. Find Good Days to Rob the Bank
• 2101. Detonate the Maximum Bombs
• 2104. Sum of Subarray Ranges
• 2105. Watering Plants II
• 2106. Maximum Fruits Harvested After at Most K Steps
• 2107. Number of Unique Flavors After Sharing K Candies 🔒
• 2108. Find First Palindromic String in the Array
• 2109. Adding Spaces to a String
• 2110. Number of Smooth Descent Periods of a Stock
• 2111. Minimum Operations to Make the Array K-Increasing
• 2113. Elements in Array After Removing and Replacing Elements 🔒
• 2114. Maximum Number of Words Found in Sentences
• 2115. Find All Possible Recipes from Given Supplies
• 2121. Intervals Between Identical Elements
• 2122. Recover the Original Array
• 2123. Minimum Operations to Remove Adjacent Ones in Matrix 🔒
• 2125. Number of Laser Beams in a Bank
• 2126. Destroying Asteroids
• 2127. Maximum Employees to Be Invited to a Meeting
• 2128. Remove All Ones With Row and Column Flips 🔒
• 2131. Longest Palindrome by Concatenating Two Letter Words
• 2132. Stamping the Grid
• 2133. Check if Every Row and Column Contains All Numbers
• 2134. Minimum Swaps to Group All 1's Together II
• 2135. Count Words Obtained After Adding a Letter
• 2136. Earliest Possible Day of Full Bloom
• 2137. Pour Water Between Buckets to Make Water Levels Equal 🔒
• 2140. Solving Questions With Brainpower
• 2141. Maximum Running Time of N Computers
• 2143. Choose Numbers From Two Arrays in Range 🔒
• 2144. Minimum Cost of Buying Candies With Discount
• 2145. Count the Hidden Sequences
• 2146. K Highest Ranked Items Within a Price Range
• 2148. Count Elements With Strictly Smaller and Greater Elements
• 2149. Rearrange Array Elements by Sign
• 2150. Find All Lonely Numbers in the Array
• 2151. Maximum Good People Based on Statements
• 2152. Minimum Number of Lines to Cover Points 🔒
• 2154. Keep Multiplying Found Values by Two
• 2155. All Divisions With the Highest Score of a Binary Array
• 2157. Groups of Strings
• 2158. Amount of New Area Painted Each Day 🔒
• 2161. Partition Array According to Given Pivot
• 2163. Minimum Difference in Sums After Removal of Elements
• 2164. Sort Even and Odd Indices Independently
• 2166. Design Bitset
• 2170. Minimum Operations to Make the Array Alternating
• 2171. Removing Minimum Number of Magic Beans
• 2172. Maximum AND Sum of Array
• 2174. Remove All Ones With Row and Column Flips II 🔒
• 2176. Count Equal and Divisible Pairs in an Array
• 2179. Count Good Triplets in an Array
• 2183. Count Array Pairs Divisible by K
• 2184. Number of Ways to Build Sturdy Brick Wall 🔒
• 2185. Counting Words With a Given Prefix
• 2187. Minimum Time to Complete Trips
• 2188. Minimum Time to Finish the Race
• 2190. Most Frequent Number Following Key In an Array
• 2191. Sort the Jumbled Numbers
• 2195. Append K Integers With Minimal Sum
• 2196. Create Binary Tree From Descriptions
• 2197. Replace Non-Coprime Numbers in Array
• 2198. Number of Single Divisor Triplets 🔒
• 2200. Find All K-Distant Indices in an Array
• 2201. Count Artifacts That Can Be Extracted
• 2202. Maximize the Topmost Element After K Moves
• 2206. Divide Array Into Equal Pairs
• 2208. Minimum Operations to Halve Array Sum
• 2210. Count Hills and Valleys in an Array
• 2212. Maximum Points in an Archery Competition
• 2213. Longest Substring of One Repeating Character
• 2214. Minimum Health to Beat Game 🔒
• 2215. Find the Difference of Two Arrays
• 2216. Minimum Deletions to Make Array Beautiful
• 2217. Find Palindrome With Fixed Length
• 2218. Maximum Value of K Coins From Piles
• 2219. Maximum Sum Score of Array 🔒
• 2221. Find Triangular Sum of an Array
• 2225. Find Players With Zero or One Losses
• 2226. Maximum Candies Allocated to K Children
• 2227. Encrypt and Decrypt Strings
• 2229. Check if an Array Is Consecutive 🔒
• 2233. Maximum Product After K Increments
• 2234. Maximum Total Beauty of the Gardens
• 2237. Count Positions on Street With Required Brightness 🔒
• 2239. Find Closest Number to Zero
• 2241. Design an ATM Machine
• 2242. Maximum Score of a Node Sequence
• 2244. Minimum Rounds to Complete All Tasks
• 2245. Maximum Trailing Zeros in a Cornered Path
• 2246. Longest Path With Different Adjacent Characters
• 2248. Intersection of Multiple Arrays
• 2249. Count Lattice Points Inside a Circle
• 2250. Count Number of Rectangles Containing Each Point
• 2251. Number of Flowers in Full Bloom
• 2255. Count Prefixes of a Given String
• 2256. Minimum Average Difference
• 2257. Count Unguarded Cells in the Grid
• 2258. Escape the Spreading Fire
• 2260. Minimum Consecutive Cards to Pick Up
• 2261. K Divisible Elements Subarrays
• 2263. Make Array Non-decreasing or Non-increasing 🔒
• 2267. Check if There Is a Valid Parentheses String Path
• 2270. Number of Ways to Split Array
• 2271. Maximum White Tiles Covered by a Carpet
• 2273. Find Resultant Array After Removing Anagrams
• 2274. Maximum Consecutive Floors Without Special Floors
• 2275. Largest Combination With Bitwise AND Greater Than Zero
• 2277. Closest Node to Path in Tree 🔒
• 2279. Maximum Bags With Full Capacity of Rocks
• 2280. Minimum Lines to Represent a Line Chart
• 2281. Sum of Total Strength of Wizards
• 2282. Number of People That Can Be Seen in a Grid 🔒
• 2284. Sender With Largest Word Count
• 2289. Steps to Make Array Non-decreasing
• 2290. Minimum Obstacle Removal to Reach Corner
• 2291. Maximum Profit From Trading Stocks 🔒
• 2293. Min Max Game
• 2294. Partition Array Such That Maximum Difference Is K
• 2295. Replace Elements in an Array
• 2297. Jump Game VIII 🔒
• 2300. Successful Pairs of Spells and Potions
• 2301. Match Substring After Replacement
• 2302. Count Subarrays With Score Less Than K
• 2303. Calculate Amount Paid in Taxes
• 2304. Minimum Path Cost in a Grid
• 2305. Fair Distribution of Cookies
• 2306. Naming a Company
• 2307. Check for Contradictions in Equations 🔒
• 2312. Selling Pieces of Wood
• 2317. Maximum XOR After Operations
• 2319. Check if Matrix Is X-Matrix
• 2321. Maximum Score Of Spliced Array
• 2322. Minimum Score After Removals on a Tree
• 2323. Find Minimum Time to Finish All Jobs II 🔒
• 2326. Spiral Matrix IV
• 2328. Number of Increasing Paths in a Grid
• 2332. The Latest Time to Catch a Bus
• 2333. Minimum Sum of Squared Difference
• 2334. Subarray With Elements Greater Than Varying Threshold
• 2335. Minimum Amount of Time to Fill Cups
• 2340. Minimum Adjacent Swaps to Make a Valid Array 🔒
• 2341. Maximum Number of Pairs in Array
• 2342. Max Sum of a Pair With Equal Sum of Digits
• 2343. Query Kth Smallest Trimmed Number
• 2344. Minimum Deletions to Make Array Divisible
• 2345. Finding the Number of Visible Mountains 🔒
• 2347. Best Poker Hand
• 2348. Number of Zero-Filled Subarrays
• 2350. Shortest Impossible Sequence of Rolls
• 2352. Equal Row and Column Pairs
• 2353. Design a Food Rating System
• 2354. Number of Excellent Pairs
• 2355. Maximum Number of Books You Can Take 🔒
• 2357. Make Array Zero by Subtracting Equal Amounts
• 2358. Maximum Number of Groups Entering a Competition
• 2361. Minimum Costs Using the Train Line 🔒
• 2363. Merge Similar Items
• 2364. Count Number of Bad Pairs
• 2365. Task Scheduler II
• 2366. Minimum Replacements to Sort the Array
• 2367. Number of Arithmetic Triplets
• 2368. Reachable Nodes With Restrictions
• 2369. Check if There is a Valid Partition For The Array
• 2371. Minimize Maximum Value in a Grid 🔒
• 2373. Largest Local Values in a Matrix
• 2381. Shifting Letters II
• 2382. Maximum Segment Sum After Removals
• 2383. Minimum Hours of Training to Win a Competition
• 2386. Find the K-Sum of an Array
• 2387. Median of a Row Wise Sorted Matrix 🔒
• 2389. Longest Subsequence With Limited Sum
• 2391. Minimum Amount of Time to Collect Garbage
• 2392. Build a Matrix With Conditions
• 2393. Count Strictly Increasing Subarrays 🔒
• 2395. Find Subarrays With Equal Sum
• 2397. Maximum Rows Covered by Columns
• 2398. Maximum Number of Robots Within Budget
• 2399. Check Distances Between Same Letters
• 2401. Longest Nice Subarray
• 2402. Meeting Rooms III
• 2403. Minimum Time to Kill All Monsters 🔒
• 2404. Most Frequent Even Element
• 2406. Divide Intervals Into Minimum Number of Groups
• 2407. Longest Increasing Subsequence II
• 2408. Design SQL
• 2410. Maximum Matching of Players With Trainers
• 2411. Smallest Subarrays With Maximum Bitwise OR
• 2412. Minimum Money Required Before Transactions
• 2416. Sum of Prefix Scores of Strings
• 2418. Sort the People
• 2419. Longest Subarray With Maximum Bitwise AND
• 2420. Find All Good Indices
• 2421. Number of Good Paths
• 2422. Merge Operations to Turn Array Into a Palindrome 🔒
• 2425. Bitwise XOR of All Pairings
• 2426. Number of Pairs Satisfying Inequality
• 2428. Maximum Sum of an Hourglass
• 2431. Maximize Total Tastiness of Purchased Fruits 🔒
• 2432. The Employee That Worked on the Longest Task
• 2433. Find The Original Array of Prefix Xor
• 2435. Paths in Matrix Whose Sum Is Divisible by K
• 2436. Minimum Split Into Subarrays With GCD Greater Than One 🔒
• 2438. Range Product Queries of Powers
• 2439. Minimize Maximum of Array
• 2440. Create Components With Same Value
• 2441. Largest Positive Integer That Exists With Its Negative
• 2442. Count Number of Distinct Integers After Reverse Operations
• 2444. Count Subarrays With Fixed Bounds
• 2445. Number of Nodes With Value One 🔒
• 2446. Determine if Two Events Have Conflict
• 2447. Number of Subarrays With GCD Equal to K
• 2448. Minimum Cost to Make Array Equal
• 2449. Minimum Number of Operations to Make Arrays Similar
• 2451. Odd String Difference
• 2452. Words Within Two Edits of Dictionary
• 2453. Destroy Sequential Targets
• 2454. Next Greater Element IV
• 2455. Average Value of Even Numbers That Are Divisible by Three
• 2456. Most Popular Video Creator
• 2458. Height of Binary Tree After Subtree Removal Queries
• 2459. Sort Array by Moving Items to Empty Space 🔒
• 2460. Apply Operations to an Array
• 2461. Maximum Sum of Distinct Subarrays With Length K
• 2462. Total Cost to Hire K Workers
• 2463. Minimum Total Distance Traveled
• 2464. Minimum Subarrays in a Valid Split 🔒
• 2465. Number of Distinct Averages
• 2467. Most Profitable Path in a Tree
• 2470. Number of Subarrays With LCM Equal to K
• 2473. Minimum Cost to Buy Apples 🔒
• 2475. Number of Unequal Triplets in Array
• 2476. Closest Nodes Queries in a Binary Search Tree
• 2482. Difference Between Ones and Zeros in Row and Column
• 2488. Count Subarrays With Median K
• 2491. Divide Players Into Teams of Equal Skill
• 2495. Number of Subarrays Having Even Product 🔒
• 2496. Maximum Value of a String in an Array
• 2497. Maximum Star Sum of a Graph
• 2498. Frog Jump II
• 2499. Minimum Total Cost to Make Arrays Unequal
• 2500. Delete Greatest Value in Each Row
• 2501. Longest Square Streak in an Array
• 2502. Design Memory Allocator
• 2503. Maximum Number of Points From Grid Queries
• 2505. Bitwise OR of All Subsequence Sums 🔒
• 2506. Count Pairs Of Similar Strings
• 2509. Cycle Length Queries in a Tree
• 2510. Check if There is a Path With Equal Number of 0's And 1's 🔒
• 2511. Maximum Enemy Forts That Can Be Captured
• 2512. Reward Top K Students
• 2515. Shortest Distance to Target String in a Circular Array
• 2517. Maximum Tastiness of Candy Basket
• 2518. Number of Great Partitions
• 2519. Count the Number of K-Big Indices 🔒
• 2521. Distinct Prime Factors of Product of Array
• 2524. Maximum Frequency Score of a Subarray 🔒
• 2527. Find Xor-Beauty of Array
• 2528. Maximize the Minimum Powered City
• 2529. Maximum Count of Positive Integer and Negative Integer
• 2530. Maximal Score After Applying K Operations
• 2532. Time to Cross a Bridge
• 2534. Time Taken to Cross the Door 🔒
• 2535. Difference Between Element Sum and Digit Sum of an Array
• 2536. Increment Submatrices by One
• 2537. Count the Number of Good Subarrays
• 2538. Difference Between Maximum and Minimum Price Sum
• 2540. Minimum Common Value
• 2541. Minimum Operations to Make Array Equal II
• 2542. Maximum Subsequence Score
• 2545. Sort the Students by Their Kth Score
• 2547. Minimum Cost to Split an Array
• 2548. Maximum Price to Fill a Bag 🔒
• 2549. Count Distinct Numbers on Board
• 2551. Put Marbles in Bags
• 2552. Count Increasing Quadruplets
• 2553. Separate the Digits in an Array
• 2554. Maximum Number of Integers to Choose From a Range I
• 2555. Maximize Win From Two Segments
• 2556. Disconnect Path in a Binary Matrix by at Most One Flip
• 2557. Maximum Number of Integers to Choose From a Range II 🔒
• 2558. Take Gifts From the Richest Pile
• 2559. Count Vowel Strings in Ranges
• 2560. House Robber IV
• 2561. Rearranging Fruits
• 2562. Find the Array Concatenation Value
• 2563. Count the Number of Fair Pairs
• 2564. Substring XOR Queries
• 2567. Minimum Score by Changing Two Elements
• 2568. Minimum Impossible OR
• 2569. Handling Sum Queries After Update
• 2570. Merge Two 2D Arrays by Summing Values
• 2572. Count the Number of Square-Free Subsets
• 2573. Find the String with
• 2574. Left and Right Sum Differences
• 2575. Find the Divisibility Array of a String
• 2576. Find the Maximum Number of Marked Indices
• 2577. Minimum Time to Visit a Cell In a Grid
• 2580. Count Ways to Group Overlapping Ranges
• 2581. Count Number of Possible Root Nodes
• 2584. Split the Array to Make Coprime Products
• 2585. Number of Ways to Earn Points
• 2586. Count the Number of Vowel Strings in Range
• 2587. Rearrange Array to Maximize Prefix Score
• 2588. Count the Number of Beautiful Subarrays
• 2589. Minimum Time to Complete All Tasks
• 2590. Design a Todo List 🔒
• 2592. Maximize Greatness of an Array
• 2593. Find Score of an Array After Marking All Elements
• 2594. Minimum Time to Repair Cars
• 2596. Check Knight Tour Configuration
• 2597. The Number of Beautiful Subsets
• 2598. Smallest Missing Non-negative Integer After Operations
• 2599. Make the Prefix Sum Non-negative 🔒
• 2601. Prime Subtraction Operation
• 2602. Minimum Operations to Make All Array Elements Equal
• 2603. Collect Coins in a Tree
• 2604. Minimum Time to Eat All Grains 🔒
• 2605. Form Smallest Number From Two Digit Arrays
• 2606. Find the Substring With Maximum Cost
• 2607. Make K-Subarray Sums Equal
• 2610. Convert an Array Into a 2D Array With Conditions
• 2611. Mice and Cheese
• 2612. Minimum Reverse Operations
• 2613. Beautiful Pairs 🔒
• 2614. Prime In Diagonal
• 2615. Sum of Distances
• 2616. Minimize the Maximum Difference of Pairs
• 2617. Minimum Number of Visited Cells in a Grid
• 2638. Count the Number of K-Free Subsets 🔒
• 2639. Find the Width of Columns of a Grid
• 2640. Find the Score of All Prefixes of an Array
• 2643. Row With Maximum Ones
• 2644. Find the Maximum Divisibility Score
• 2646. Minimize the Total Price of the Trips
• 2647. Color the Triangle Red 🔒
• 2653. Sliding Subarray Beauty
• 2654. Minimum Number of Operations to Make All Array Elements Equal to 1
• 2655. Find Maximal Uncovered Ranges 🔒
• 2656. Maximum Sum With Exactly K Elements
• 2657. Find the Prefix Common Array of Two Arrays
• 2658. Maximum Number of Fish in a Grid
• 2659. Make Array Empty
• 2660. Determine the Winner of a Bowling Game
• 2661. First Completely Painted Row or Column
• 2662. Minimum Cost of a Path With Special Roads
• 2664. The Knight’s Tour 🔒
• 2670. Find the Distinct Difference Array
• 2672. Number of Adjacent Elements With the Same Color
• 2673. Make Costs of Paths Equal in a Binary Tree
• 2678. Number of Senior Citizens
• 2679. Sum in a Matrix
• 2680. Maximum OR
• 2681. Power of Heroes
• 2682. Find the Losers of the Circular Game
• 2683. Neighboring Bitwise XOR
• 2684. Maximum Number of Moves in a Grid
• 2702. Minimum Operations to Make Numbers Non-positive 🔒
• 2706. Buy Two Chocolates
• 2707. Extra Characters in a String
• 2708. Maximum Strength of a Group
• 2709. Greatest Common Divisor Traversal
• 2711. Difference of Number of Distinct Values on Diagonals
• 2713. Maximum Strictly Increasing Cells in a Matrix
• 2717. Semi-Ordered Permutation
• 2718. Sum of Matrix After Queries
• 2728. Count Houses in a Circular Street 🔒
• 2731. Movement of Robots
• 2732. Find a Good Subset of the Matrix
• 2733. Neither Minimum nor Maximum
• 2735. Collecting Chocolates
• 2736. Maximum Sum Queries
• 2737. Find the Closest Marked Node 🔒
• 2740. Find the Value of the Partition
• 2741. Special Permutations
• 2742. Painting the Walls
• 2744. Find Maximum Number of String Pairs
• 2746. Decremental String Concatenation
• 2747. Count Zero Request Servers
• 2748. Number of Beautiful Pairs
• 2750. Ways to Split Array Into Good Subarrays
• 2751. Robot Collisions
• 2760. Longest Even Odd Subarray With Threshold
• 2761. Prime Pairs With Target Sum
• 2762. Continuous Subarrays
• 2763. Sum of Imbalance Numbers of All Subarrays
• 2765. Longest Alternating Subarray
• 2766. Relocate Marbles
• 2768. Number of Black Blocks
• 2770. Maximum Number of Jumps to Reach the Last Index
• 2771. Longest Non-decreasing Subarray From Two Arrays
• 2772. Apply Operations to Make All Array Elements Equal to Zero
• 2778. Sum of Squares of Special Elements
• 2779. Maximum Beauty of an Array After Applying Operation
• 2780. Minimum Index of a Valid Split
• 2781. Length of the Longest Valid Substring
• 2784. Check if Array is Good
• 2786. Visit Array Positions to Maximize Score
• 2788. Split Strings by Separator
• 2789. Largest Element in an Array after Merge Operations
• 2790. Maximum Number of Groups With Increasing Length
• 2798. Number of Employees Who Met the Target
• 2799. Count Complete Subarrays in an Array
• 2808. Minimum Seconds to Equalize a Circular Array
• 2809. Minimum Time to Make Array Sum At Most x
• 2811. Check if it is Possible to Split Array
• 2812. Find the Safest Path in a Grid
• 2813. Maximum Elegance of a K-Length Subsequence
• 2814. Minimum Time Takes to Reach Destination Without Drowning 🔒
• 2815. Max Pair Sum in an Array
• 2817. Minimum Absolute Difference Between Elements With Constraint
• 2818. Apply Operations to Maximize Score
• 2819. Minimum Relative Loss After Buying Chocolates 🔒
• 2824. Count Pairs Whose Sum is Less than Target
• 2826. Sorting Three Groups
• 2828. Check if a String Is an Acronym of Words
• 2830. Maximize the Profit as the Salesman
• 2831. Find the Longest Equal Subarray
• 2832. Maximal Range That Each Element Is Maximum in It 🔒
• 2835. Minimum Operations to Form Subsequence With Target Sum
• 2836. Maximize Value of Function in a Ball Passing Game
• 2838. Maximum Coins Heroes Can Collect 🔒
• 2841. Maximum Sum of Almost Unique Subarray
• 2845. Count of Interesting Subarrays
• 2846. Minimum Edge Weight Equilibrium Queries in a Tree
• 2848. Points That Intersect With Cars
• 2850. Minimum Moves to Spread Stones Over Grid
• 2852. Sum of Remoteness of All Cells 🔒
• 2855. Minimum Right Shifts to Sort the Array
• 2856. Minimum Array Length After Pair Removals
• 2857. Count Pairs of Points With Distance k
• 2859. Sum of Values at Indices With K Set Bits
• 2860. Happy Students
• 2861. Maximum Number of Alloys
• 2862. Maximum Element-Sum of a Complete Subset of Indices
• 2863. Maximum Length of Semi-Decreasing Subarrays 🔒
• 2865. Beautiful Towers I
• 2866. Beautiful Towers II
• 2868. The Wording Game 🔒
• 2869. Minimum Operations to Collect Elements
• 2870. Minimum Number of Operations to Make Array Empty
• 2871. Split Array Into Maximum Number of Subarrays
• 2873. Maximum Value of an Ordered Triplet I
• 2874. Maximum Value of an Ordered Triplet II
• 2875. Minimum Size Subarray in Infinite Array
• 2892. Minimizing Array After Replacing Pairs With Their Product 🔒
• 2895. Minimum Processing Time
• 2897. Apply Operations on Array to Maximize Sum of Squares
• 2898. Maximum Linear Stock Score 🔒
• 2899. Last Visited Integers
• 2900. Longest Unequal Adjacent Groups Subsequence I
• 2901. Longest Unequal Adjacent Groups Subsequence II
• 2902. Count of Sub-Multisets With Bounded Sum
• 2903. Find Indices With Index and Value Difference I
• 2905. Find Indices With Index and Value Difference II
• 2906. Construct Product Matrix
• 2907. Maximum Profitable Triplets With Increasing Prices I 🔒
• 2908. Minimum Sum of Mountain Triplets I
• 2909. Minimum Sum of Mountain Triplets II
• 2910. Minimum Number of Groups to Create a Valid Assignment
• 2913. Subarrays Distinct Element Sum of Squares I
• 2915. Length of the Longest Subsequence That Sums to Target
• 2916. Subarrays Distinct Element Sum of Squares II
• 2917. Find the K-or of an Array
• 2918. Minimum Equal Sum of Two Arrays After Replacing Zeros
• 2919. Minimum Increment Operations to Make Array Beautiful
• 2920. Maximum Points After Collecting Coins From All Nodes
• 2921. Maximum Profitable Triplets With Increasing Prices II 🔒
• 2923. Find Champion I
• 2926. Maximum Balanced Subsequence Sum
• 2931. Maximum Spending After Buying Items
• 2932. Maximum Strong Pair XOR I
• 2933. High-Access Employees
• 2934. Minimum Operations to Maximize Last Elements in Arrays
• 2935. Maximum Strong Pair XOR II
• 2936. Number of Equal Numbers Blocks 🔒
• 2940. Find Building Where Alice and Bob Can Meet
• 2941. Maximum GCD-Sum of a Subarray 🔒
• 2942. Find Words Containing Character
• 2943. Maximize Area of Square Hole in Grid
• 2944. Minimum Number of Coins for Fruits
• 2945. Find Maximum Non-decreasing Array Length
• 2946. Matrix Similarity After Cyclic Shifts
• 2948. Make Lexicographically Smallest Array by Swapping Elements
• 2951. Find the Peaks
• 2952. Minimum Number of Coins to be Added
• 2954. Count the Number of Infection Sequences
• 2955. Number of Same-End Substrings 🔒
• 2956. Find Common Elements Between Two Arrays
• 2958. Length of Longest Subarray With at Most K Frequency
• 2960. Count Tested Devices After Test Operations
• 2961. Double Modular Exponentiation
• 2962. Count Subarrays Where Max Element Appears at Least K Times
• 2963. Count the Number of Good Partitions
• 2964. Number of Divisible Triplet Sums 🔒
• 2965. Find Missing and Repeated Values
• 2966. Divide Array Into Arrays With Max Difference
• 2967. Minimum Cost to Make Array Equalindromic
• 2968. Apply Operations to Maximize Frequency Score
• 2969. Minimum Number of Coins for Fruits II 🔒
• 2970. Count the Number of Incremovable Subarrays I
• 2971. Find Polygon With the Largest Perimeter
• 2972. Count the Number of Incremovable Subarrays II
• 2974. Minimum Number Game
• 2975. Maximum Square Area by Removing Fences From a Field
• 2976. Minimum Cost to Convert String I
• 2977. Minimum Cost to Convert String II
• 2980. Check if Bitwise OR Has Trailing Zeros
• 2983. Palindrome Rearrangement Queries
• 2992. Number of Self-Divisible Permutations 🔒
• 2996. Smallest Missing Integer Greater Than Sequential Prefix Sum
• 2997. Minimum Number of Operations to Make Array XOR Equal to K
• 3000. Maximum Area of Longest Diagonal Rectangle
• 3002. Maximum Size of a Set After Removals
• 3004. Maximum Subtree of the Same Color 🔒
• 3005. Count Elements With Maximum Frequency
• 3009. Maximum Number of Intersections on the Chart 🔒
• 3010. Divide an Array Into Subarrays With Minimum Cost I
• 3011. Find if Array Can Be Sorted
• 3012. Minimize Length of Array Using Operations
• 3013. Divide an Array Into Subarrays With Minimum Cost II
• 3018. Maximum Number of Removal Queries That Can Be Processed I 🔒
• 3020. Find the Maximum Number of Elements in Subset
• 3022. Minimize OR of Remaining Elements Using Operations
• 3023. Find Pattern in Infinite Stream I 🔒
• 3024. Type of Triangle
• 3025. Find the Number of Ways to Place People I
• 3026. Maximum Good Subarray Sum
• 3027. Find the Number of Ways to Place People II
• 3028. Ant on the Boundary
• 3030. Find the Grid of Region Average
• 3033. Modify the Matrix
• 3034. Number of Subarrays That Match a Pattern I
• 3035. Maximum Palindromes After Operations
• 3036. Number of Subarrays That Match a Pattern II
• 3037. Find Pattern in Infinite Stream II 🔒
• 3038. Maximum Number of Operations With the Same Score I
• 3039. Apply Operations to Make String Empty
• 3040. Maximum Number of Operations With the Same Score II
• 3041. Maximize Consecutive Elements in an Array After Modification
• 3042. Count Prefix and Suffix Pairs I
• 3043. Find the Length of the Longest Common Prefix
• 3044. Most Frequent Prime
• 3045. Count Prefix and Suffix Pairs II
• 3046. Split the Array
• 3047. Find the Largest Area of Square Inside Two Rectangles
• 3048. Earliest Second to Mark Indices I
• 3049. Earliest Second to Mark Indices II
• 3065. Minimum Operations to Exceed Threshold Value I
• 3066. Minimum Operations to Exceed Threshold Value II
• 3067. Count Pairs of Connectable Servers in a Weighted Tree Network
• 3068. Find the Maximum Sum of Node Values
• 3069. Distribute Elements Into Two Arrays I
• 3070. Count Submatrices with Top-Left Element and Sum Less Than k
• 3071. Minimum Operations to Write the Letter Y on a Grid
• 3072. Distribute Elements Into Two Arrays II
• 3073. Maximum Increasing Triplet Value 🔒
• 3074. Apple Redistribution into Boxes
• 3075. Maximize Happiness of Selected Children
• 3076. Shortest Uncommon Substring in an Array
• 3077. Maximum Strength of K Disjoint Subarrays
• 3078. Match Alphanumerical Pattern in Matrix I 🔒
• 3079. Find the Sum of Encrypted Integers
• 3080. Mark Elements on Array by Performing Queries
• 3082. Find the Sum of the Power of All Subsequences
• 3086. Minimum Moves to Pick K Ones
• 3092. Most Frequent IDs
• 3093. Longest Common Suffix Queries
• 3095. Shortest Subarray With OR at Least K I
• 3096. Minimum Levels to Gain More Points
• 3097. Shortest Subarray With OR at Least K II
• 3098. Find the Sum of Subsequence Powers
• 3101. Count Alternating Subarrays
• 3102. Minimize Manhattan Distances
• 3105. Longest Strictly Increasing or Strictly Decreasing Subarray
• 3107. Minimum Operations to Make Median of Array Equal to K
• 3108. Minimum Cost Walk in Weighted Graph
• 3109. Find the Index of Permutation 🔒
• 3111. Minimum Rectangles to Cover Points
• 3112. Minimum Time to Visit Disappearing Nodes
• 3113. Find the Number of Subarrays Where Boundary Elements Are Maximum
• 3115. Maximum Prime Difference
• 3116. Kth Smallest Amount With Single Denomination Combination
• 3117. Minimum Sum of Values by Dividing Array
• 3122. Minimum Number of Operations to Satisfy Conditions
• 3127. Make a Square with the Same Color
• 3128. Right Triangles
• 3131. Find the Integer Added to Array I
• 3132. Find the Integer Added to Array II
• 3134. Find the Median of the Uniqueness Array
• 3139. Minimum Cost to Equalize Array
• 3141. Maximum Hamming Distances 🔒
• 3142. Check if Grid Satisfies Conditions
• 3143. Maximum Points Inside the Square
• 3145. Find Products of Elements of Big Array
• 3147. Taking Maximum Energy From the Mystic Dungeon
• 3148. Maximum Difference Score in a Grid
• 3149. Find the Minimum Cost Array Permutation
• 3151. Special Array I
• 3152. Special Array II
• 3153. Sum of Digit Differences of All Pairs
• 3155. Maximum Number of Upgradable Servers 🔒
• 3158. Find the XOR of Numbers Which Appear Twice
• 3159. Find Occurrences of an Element in an Array
• 3160. Find the Number of Distinct Colors Among the Balls
• 3161. Block Placement Queries
• 3162. Find the Number of Good Pairs I
• 3164. Find the Number of Good Pairs II
• 3165. Maximum Sum of Subsequence With Non-adjacent Elements
• 3169. Count Days Without Meetings
• 3171. Find Subarray With Bitwise OR Closest to K
• 3173. Bitwise OR of Adjacent Elements 🔒
• 3175. Find The First Player to win K Games in a Row
• 3176. Find the Maximum Length of a Good Subsequence I
• 3177. Find the Maximum Length of a Good Subsequence II
• 3179. Find the N-th Value After K Seconds
• 3180. Maximum Total Reward Using Operations I
• 3181. Maximum Total Reward Using Operations II
• 3183. The Number of Ways to Make the Sum 🔒
• 3184. Count Pairs That Form a Complete Day I
• 3185. Count Pairs That Form a Complete Day II
• 3186. Maximum Total Damage With Spell Casting
• 3187. Peaks in Array
• 3189. Minimum Moves to Get a Peaceful Board 🔒
• 3190. Find Minimum Operations to Make All Elements Divisible by Three
• 3191. Minimum Operations to Make Binary Array Elements Equal to One I
• 3192. Minimum Operations to Make Binary Array Elements Equal to One II
• 3193. Count the Number of Inversions
• 3194. Minimum Average of Smallest and Largest Elements
• 3195. Find the Minimum Area to Cover All Ones I
• 3196. Maximize Total Cost of Alternating Subarrays
• 3197. Find the Minimum Area to Cover All Ones II
• 3199. Count Triplets with Even XOR Set Bits I 🔒
• 3200. Maximum Height of a Triangle
• 3201. Find the Maximum Length of Valid Subsequence I
• 3202. Find the Maximum Length of Valid Subsequence II
• 3205. Maximum Array Hopping Score I 🔒
• 3206. Alternating Groups I
• 3207. Maximum Points After Enemy Battles
• 3208. Alternating Groups II
• 3209. Number of Subarrays With AND Value of K
• 3212. Count Submatrices With Equal Frequency of X and Y
• 3213. Construct String with Minimum Cost
• 3215. Count Triplets with Even XOR Set Bits II 🔒
• 3217. Delete Nodes From Linked List Present in Array
• 3218. Minimum Cost for Cutting Cake I
• 3219. Minimum Cost for Cutting Cake II
• 3221. Maximum Array Hopping Score II 🔒
• 3224. Minimum Array Changes to Make Differences Equal
• 3225. Maximum Score From Grid Operations
• 3229. Minimum Operations to Make Array Equal to Target
• 3231. Minimum Number of Increasing Subsequence to Be Removed 🔒
• 3232. Find if Digit Game Can Be Won
• 3233. Find the Count of Numbers Which Are Not Special
• 3235. Check if the Rectangle Corner Is Reachable
• 3237. Alt and Tab Simulation 🔒
• 3238. Find the Number of Winning Players
• 3239. Minimum Number of Flips to Make Binary Grid Palindromic I
• 3240. Minimum Number of Flips to Make Binary Grid Palindromic II
• 3242. Design Neighbor Sum Service
• 3243. Shortest Distance After Road Addition Queries I
• 3244. Shortest Distance After Road Addition Queries II
• 3245. Alternating Groups III
• 3247. Number of Subsequences with Odd Sum 🔒
• 3248. Snake in Matrix
• 3250. Find the Count of Monotonic Pairs I
• 3251. Find the Count of Monotonic Pairs II
• 3254. Find the Power of K-Size Subarrays I
• 3255. Find the Power of K-Size Subarrays II
• 3256. Maximum Value Sum by Placing Three Rooks I
• 3257. Maximum Value Sum by Placing Three Rooks II
• 3259. Maximum Energy Boost From Two Drinks
• 3261. Count Substrings That Satisfy K-Constraint II
• 3263. Convert Doubly Linked List to Array I 🔒
• 3264. Final Array State After K Multiplication Operations I
• 3265. Count Almost Equal Pairs I
• 3266. Final Array State After K Multiplication Operations II
• 3267. Count Almost Equal Pairs II
• 3269. Constructing Two Increasing Arrays 🔒
• 3273. Minimum Amount of Damage Dealt to Bob
• 3275. K-th Nearest Obstacle Queries
• 3276. Select Cells in Grid With Maximum Score
• 3277. Maximum XOR Score Subarray Queries
• 3279. Maximum Total Area Occupied by Pistons 🔒
• 3281. Maximize Score of Numbers in Ranges
• 3282. Reach End of Array With Max Score
• 3283. Maximum Number of Moves to Kill All Pawns
• 3284. Sum of Consecutive Subarrays 🔒
• 3285. Find Indices of Stable Mountains
• 3286. Find a Safe Walk Through a Grid
• 3287. Find the Maximum Sequence Value of Array
• 3288. Length of the Longest Increasing Path
• 3289. The Two Sneaky Numbers of Digitville
• 3290. Maximum Multiplication Score
• 3291. Minimum Number of Valid Strings to Form Target I
• 3292. Minimum Number of Valid Strings to Form Target II
• 3294. Convert Doubly Linked List to Array II 🔒
• 3295. Report Spam Message
• 3296. Minimum Number of Seconds to Make Mountain Height Zero
• 3299. Sum of Consecutive Subsequences 🔒
• 3300. Minimum Element After Replacement With Digit Sum
• 3301. Maximize the Total Height of Unique Towers
• 3309. Maximum Possible Number by Binary Concatenation
• 3311. Construct 2D Grid Matching Graph Layout
• 3312. Sorted GCD Pair Queries
• 3314. Construct the Minimum Bitwise Array I
• 3315. Construct the Minimum Bitwise Array II
• 3316. Find Maximum Removals From Source String
• 3318. Find X-Sum of All K-Long Subarrays I
• 3321. Find X-Sum of All K-Long Subarrays II
• 3323. Minimize Connected Groups by Inserting Interval 🔒
• 3326. Minimum Division Operations to Make Array Non Decreasing
• 3327. Check if DFS Strings Are Palindromes
• 3331. Find Subtree Sizes After Changes
• 3332. Maximum Points Tourist Can Earn
• 3334. Find the Maximum Factor Score of Array
• 3336. Find the Number of Subsequences With Equal GCD
• 3341. Find Minimum Time to Reach Last Room I
• 3342. Find Minimum Time to Reach Last Room II
• 3346. Maximum Frequency of an Element After Performing Operations I
• 3347. Maximum Frequency of an Element After Performing Operations II
• 3349. Adjacent Increasing Subarrays Detection I
• 3350. Adjacent Increasing Subarrays Detection II
• 3351. Sum of Good Subsequences
• 3353. Minimum Total Operations 🔒
• 3354. Make Array Elements Equal to Zero
• 3355. Zero Array Transformation I
• 3356. Zero Array Transformation II
• 3357. Minimize the Maximum Adjacent Element Difference
• 3359. Find Sorted Submatrices With Maximum Element at Most K 🔒
• 3361. Shift Distance Between Two Strings
• 3362. Zero Array Transformation III
• 3363. Find the Maximum Number of Fruits Collected
• 3364. Minimum Positive Sum Subarray
• 3366. Minimum Array Sum
• 3371. Identify the Largest Outlier in an Array
• 3375. Minimum Operations to Make Array Values Equal to K
• 3376. Minimum Time to Break Locks I
• 3378. Count Connected Components in LCM Graph
• 3379. Transformed Array
• 3380. Maximum Area Rectangle With Point Constraints I
• 3381. Maximum Subarray Sum With Length Divisible by K
• 3382. Maximum Area Rectangle With Point Constraints II
• 3383. Minimum Runes to Add to Cast Spell 🔒
• 3385. Minimum Time to Break Locks II 🔒
• 3386. Button with Longest Push Time
• 3387. Maximize Amount After Two Days of Conversions
• 3388. Count Beautiful Splits in an Array
• 3391. Design a 3D Binary Matrix with Efficient Layer Tracking 🔒
• 3392. Count Subarrays of Length Three With a Condition
• 3393. Count Paths With the Given XOR Value
• 3394. Check if Grid can be Cut into Sections
• 3395. Subsequences with a Unique Middle Mode I
• 3396. Minimum Number of Operations to Make Elements in Array Distinct
• 3397. Maximum Number of Distinct Elements After Operations
• 3398. Smallest Substring With Identical Characters I
• 3400. Maximum Number of Matching Indices After Right Shifts 🔒
• 3402. Minimum Operations to Make Columns Strictly Increasing
• 3404. Count Special Subsequences
• 3409. Longest Subsequence With Decreasing Adjacent Difference
• 3410. Maximize Subarray Sum After Removing All Occurrences of One Element
• 3411. Maximum Subarray With Equal Products
• 3413. Maximum Coins From K Consecutive Bags
• 3414. Maximum Score of Non-overlapping Intervals
• 3416. Subsequences with a Unique Middle Mode II 🔒
• 3417. Zigzag Grid Traversal With Skip
• 3418. Maximum Amount of Money Robot Can Earn
• 3420. Count Non-Decreasing Subarrays After K Operations
• 3422. Minimum Operations to Make Subarray Elements Equal 🔒
• 3423. Maximum Difference Between Adjacent Elements in a Circular Array
• 3424. Minimum Cost to Make Arrays Identical
• 3425. Longest Special Path
• 3427. Sum of Variable Length Subarrays
• 3428. Maximum and Minimum Sums of at Most Size K Subsequences
• 3429. Paint House IV
• 3430. Maximum and Minimum Sums of at Most Size K Subarrays
• 3431. Minimum Unlocked Indices to Sort Nums 🔒
• 3432. Count Partitions with Even Sum Difference
• 3433. Count Mentions Per User
• 3434. Maximum Frequency After Subarray Operation
• 3435. Frequencies of Shortest Supersequences
• 3437. Permutations III 🔒
• 3439. Reschedule Meetings for Maximum Free Time I
• 3440. Reschedule Meetings for Maximum Free Time II
• 3444. Minimum Increments for Target Multiples in an Array
• 3446. Sort Matrix by Diagonals
• 3447. Assign Elements to Groups with Constraints
• 3449. Maximize the Minimum Game Score
• 3450. Maximum Students on a Single Bench 🔒
• 3452. Sum of Good Numbers
• 3453. Separate Squares I
• 3454. Separate Squares II
• 3457. Eat Pizzas!
• 3459. Length of Longest V-Shaped Diagonal Segment
• 3462. Maximum Sum With at Most K Elements
• 3464. Maximize the Distance Between Points on a Square
• 3466. Maximum Coin Collection 🔒
• 3467. Transform Array by Parity
• 3468. Find the Number of Copy Arrays
• 3470. Permutations IV
• 3471. Find the Largest Almost Missing Integer
• 3473. Sum of K Subarrays With Length at Least M
• 3476. Maximize Profit from Task Assignment 🔒
• 3477. Fruits Into Baskets II
• 3478. Choose K Elements With Maximum Sum
• 3479. Fruits Into Baskets III
• 3480. Maximize Subarrays After Removing One Conflicting Pair
• 3481. Apply Substitutions 🔒
• 3483. Unique 3-Digit Even Numbers
• 3484. Design Spreadsheet
• 3485. Longest Common Prefix of K Strings After Removal
• 3486. Longest Special Path II
• 3487. Maximum Unique Subarray Sum After Deletion
• 3488. Closest Equal Element Queries
• 3489. Zero Array Transformation IV
• 3491. Phone Number Prefix 🔒
• 3493. Properties Graph
• 3494. Find the Minimum Amount of Time to Brew Potions
• 3495. Minimum Operations to Make Array Elements Zero
• 3496. Maximize Score After Pair Deletions 🔒
• 3500. Minimum Cost to Divide Array Into Subarrays
• 3501. Maximize Active Section with Trade II
• 3502. Minimum Cost to Reach Every Position
• 3505. Minimum Operations to Make Elements Within K Subarrays Equal
• 3506. Find Time Required to Eliminate Bacterial Strains 🔒
• 3507. Minimum Pair Removal to Sort Array I
• 3508. Implement Router
• 3509. Maximum Product of Subsequences With an Alternating Sum Equal to K
• 3510. Minimum Pair Removal to Sort Array II
• 3511. Make a Positive Array 🔒
• 3512. Minimum Operations to Make Array Sum Divisible by K
• 3513. Number of Unique XOR Triplets I
• 3514. Number of Unique XOR Triplets II
• 3515. Shortest Path in a Weighted Tree
• 3520. Minimum Threshold for Inversion Pairs Count 🔒
• 3522. Calculate Score After Performing Instructions
• 3523. Make Array Non-decreasing
• 3524. Find X Value of Array I
• 3525. Find X Value of Array II
• 3526. Range XOR Queries with Subarray Reversals 🔒
• 3527. Find the Most Common Response
• 3529. Count Cells in Overlapping Horizontal and Vertical Substrings
• 3530. Maximum Profit from Valid Topological Order in DAG
• 3531. Count Covered Buildings
• 3532. Path Existence Queries in a Graph I
• 3533. Concatenated Divisibility
• 3534. Path Existence Queries in a Graph II
• 3535. Unit Conversion II 🔒
• 3537. Fill a Special Grid
• 3538. Merge Operations for Minimum Travel Time
• 3539. Find Sum of Array Product of Magical Sequences
• 3540. Minimum Time to Visit All Houses 🔒
• 3542. Minimum Operations to Convert All Elements to Zero
• 3544. Subtree Inversion Sum
• 3546. Equal Sum Grid Partition I
• 3548. Equal Sum Grid Partition II
• 3549. Multiply Two Polynomials 🔒
• 3550. Smallest Index With Digit Sum Equal to Index
• 3551. Minimum Swaps to Sort by Digit Sum
• 3552. Grid Teleportation Traversal
• 3553. Minimum Weighted Subgraph With the Required Paths II
• 3555. Smallest Subarray to Sort in Every Sliding Window 🔒
• 3559. Number of Ways to Assign Edge Weights II
• 3562. Maximum Profit from Trading Stocks with Discounts
• 3565. Sequential Grid Path Cover 🔒
• 3566. Partition Array into Two Equal Product Subsets
• 3567. Minimum Absolute Difference in Sliding Submatrix
• 3568. Minimum Moves to Clean the Classroom
• 3569. Maximize Count of Distinct Primes After Split
• 3572. Maximize Y‑Sum by Picking a Triplet of Distinct X‑Values
• 3573. Best Time to Buy and Sell Stock V
• 3574. Maximize Subarray GCD Score
• 3575. Maximum Good Subtree Score
• 3576. Transform Array to All Equal Elements
• 3577. Count the Number of Computer Unlocking Permutations
• 3578. Count Partitions With Max-Min Difference at Most K
• 3583. Count Special Triplets
• 3584. Maximum Product of First and Last Elements of a Subsequence
• 3585. Find Weighted Median Node in Tree
• 3587. Minimum Adjacent Swaps to Alternate Parity
• 3588. Find Maximum Area of a Triangle
• 3589. Count Prime-Gap Balanced Subarrays
• 3590. Kth Smallest Path XOR Sum
• 3591. Check if Any Element Has Prime Frequency
• 3592. Inverse Coin Change
• 3593. Minimum Increments to Equalize Leaf Paths
• 3594. Minimum Time to Transport All Individuals
• 3595. Once Twice 🔒
• 3598. Longest Common Prefix Between Adjacent Strings After Removals
• 3599. Partition Array to Minimize XOR
• 3603. Minimum Cost Path with Alternating Directions II
• 3605. Minimum Stability Factor of Array
• 3606. Coupon Code Validator
• 3607. Power Grid Maintenance
• 3610. Minimum Number of Primes to Sum to Target 🔒
• 3616. Number of Student Replacements 🔒
• 3618. Split Array by Prime Indices
• 3619. Count Islands With Total Value Divisible by K
• 3620. Network Recovery Pathways
• 3623. Count Number of Trapezoids I
• 3624. Number of Integers With Popcount-Depth Equal to K II
• 3625. Count Number of Trapezoids II
• 3629. Minimum Jumps to Reach End via Prime Teleportation
• 3630. Partition Array for Maximum XOR and AND
• 3631. Sort Threats by Severity and Exploitability 🔒
• 3632. Subarrays with XOR at Least K 🔒
• 3633. Earliest Finish Time for Land and Water Rides I
• 3634. Minimum Removals to Balance Array
• 3635. Earliest Finish Time for Land and Water Rides II
• 3636. Threshold Majority Queries
• 3637. Trionic Array I
• 3638. Maximum Balanced Shipments
• 3639. Minimum Time to Activate String
• 3640. Trionic Array II
• 3641. Longest Semi-Repeating Subarray 🔒
• 3643. Flip Square Submatrix Vertically
• 3644. Maximum K to Sort a Permutation
• 3645. Maximum Total from Optimal Activation Order
• 3647. Maximum Weight in Two Bags 🔒
• 3651. Minimum Cost Path with Teleportations
• 3652. Best Time to Buy and Sell Stock using Strategy
• 3653. XOR After Range Multiplication Queries I
• 3654. Minimum Sum After Divisible Sum Deletions
• 3655. XOR After Range Multiplication Queries II
• 3656. Determine if a Simple Graph Exists 🔒
• 3659. Partition Array Into K-Distinct Groups
• 3660. Jump Game IX
• 3661. Maximum Walls Destroyed by Robots
• 3663. Find The Least Frequent Digit
• 3664. Two-Letter Card Game
• 3665. Twisted Mirror Path Count
• 3667. Sort Array By Absolute Value 🔒
• 3668. Restore Finishing Order
• 3670. Maximum Product of Two Integers With No Common Bits
• 3671. Sum of Beautiful Subsequences
• 3672. Sum of Weighted Modes in Subarrays 🔒
• 3674. Minimum Operations to Equalize Array
• 3676. Count Bowl Subarrays
• 3678. Smallest Absent Positive Greater Than Average
• 3679. Minimum Discards to Balance Inventory
• 3680. Generate Schedule
• 3681. Maximum XOR of Subsequences
• 3682. Minimum Index Sum of Common Elements 🔒
• 3684. Maximize Sum of At Most K Distinct Elements
• 3685. Subsequence Sum After Capping Elements
• 3686. Number of Stable Subsequences
• 3687. Library Late Fee Calculator 🔒
• 3688. Bitwise OR of Even Numbers in an Array
• 3689. Maximum Total Subarray Value I
• 3691. Maximum Total Subarray Value II
• 3695. Maximize Alternating Sum Using Swaps
• 3696. Maximum Distance Between Unequal Words in Array I 🔒
• 3697. Compute Decimal Representation
• 3698. Split Array With Minimum Difference
• 3701. Compute Alternating Sum
• 3702. Longest Subsequence With Non-Zero Bitwise XOR
• 3706. Maximum Distance Between Unequal Words in Array II 🔒
• 3708. Longest Fibonacci Subarray
• 3709. Design Exam Scores Tracker
• 3710. Maximum Partition Factor
• 3711. Maximum Transactions Without Negative Balance 🔒
• 3712. Sum of Elements With Frequency Divisible by K
• 3715. Sum of Perfect Square Ancestors
• 3717. Minimum Operations to Make the Array Beautiful 🔒
• 3718. Smallest Missing Multiple of K
• 3719. Longest Balanced Subarray I
• 3721. Longest Balanced Subarray II
• 3724. Minimum Operations to Transform Array
• 3725. Count Ways to Choose Coprime Integers from Rows
• 3727. Maximum Alternating Sum of Squares
• 3728. Stable Subarrays With Equal Boundary and Interior Sum
• 3729. Count Distinct Subarrays Divisible by K in Sorted Array
• 3730. Maximum Calories Burnt from Jumps 🔒
• 3731. Find Missing Elements
• 3732. Maximum Product of Three Elements After One Replacement
• 3736. Minimum Moves to Equal Array Elements III
• 3737. Count Subarrays With Majority Element I
• 3738. Longest Non-Decreasing Subarray After Replacing at Most One Element
• 3739. Count Subarrays With Majority Element II
• 3740. Minimum Distance Between Three Equal Elements I
• 3741. Minimum Distance Between Three Equal Elements II
• 3742. Maximum Path Score in a Grid
• 3743. Maximize Cyclic Partition Score
• 3745. Maximize Expression of Three Elements
• 3748. Count Stable Subarrays
• 3752. Lexicographically Smallest Negated Permutation that Sums to Target
• 3755. Find Maximum Balanced XOR Subarray Length
• 3757. Number of Effective Subsequences
• 3759. Count Elements With at Least K Greater Values
• 3761. Minimum Absolute Distance Between Mirror Pairs
• 3762. Minimum Operations to Equalize Subarrays
• 3763. Maximum Total Sum with Threshold Constraints 🔒
• 3766. Minimum Operations to Make Binary Palindrome
• 3767. Maximize Points After Choosing K Tasks
• 3768. Minimum Inversion Count in Subarrays of Fixed Length
• 3769. Sort Integers by Binary Reflection
• 3770. Largest Prime from Consecutive Prime Sum
• 3771. Total Score of Dungeon Runs
• 3772. Maximum Subgraph Score in a Tree
• 3774. Absolute Difference Between Maximum and Minimum K Elements
• 3776. Minimum Moves to Balance Circular Array
• 3779. Minimum Number of Operations to Have Distinct Elements
• 3780. Maximum Sum of Three Numbers Divisible by Three
• 3781. Maximum Score After Binary Swaps
• 3784. Minimum Deletion Cost to Make All Characters Equal
• 3785. Minimum Swaps to Avoid Forbidden Values
• 3786. Total Sum of Interaction Cost in Tree Groups
• 3788. Maximum Score of a Split
• 3795. Minimum Subarray Length With Distinct Sum At Least K
• 3796. Find Maximum Value in a Constrained Sequence
• 3797. Count Routes to Climb a Rectangular Grid
• 3799. Word Squares II
• 3801. Minimum Cost to Merge Sorted Lists
• 3804. Number of Centered Subarrays
• 3805. Count Caesar Cipher Pairs
• 3806. Maximum Bitwise AND After Increment Operations
• 3809. Best Reachable Tower
• 3810. Minimum Operations to Reach Target Array
• 3811. Number of Alternating XOR Partitions
• 3814. Maximum Capacity Within Budget
• 3818. Minimum Prefix Removal to Make Array Strictly Increasing
• 3824. Minimum K to Reduce Array Within Limit
• 3826. Minimum Partition Score
• 3828. Final Element After Subarray Deletions
• 3830. Longest Alternating Subarray After Removing At Most One Element
• 3833. Count Dominant Indices
• 3834. Merge Adjacent Equal Elements
• 3835. Count Subarrays With Cost Less Than or Equal to K
• 3836. Maximum Score Using Exactly K Pairs
• 3837. Delayed Count of Equal Elements 🔒
• 3838. Weighted Word Mapping
• 3839. Number of Prefix Connected Groups
• 3840. House Robber V
• 3841. Palindromic Path Queries in a Tree
• 3842. Toggle Light Bulbs
• 3843. First Element with Unique Frequency
• 3845. Maximum Subarray XOR with Bounded Range
• 3847. Find the Score Difference in a Game
• 3850. Count Sequences to K
• 3851. Maximum Requests Without Violating the Limit 🔒
• 3852. Smallest Pair With Different Frequencies
• 3854. Minimum Operations to Make Array Parity Alternating
• 3859. Count Subarrays With K Distinct Integers
• 3860. Unique Email Groups 🔒
• 3861. Minimum Capacity Box
• 3862. Find the Smallest Balanced Index
• 3865. Reverse K Subarrays 🔒
• 3866. First Unique Even Element
• 3867. Sum of GCD of Formed Pairs
• 3868. Minimum Cost to Equalize Arrays Using Swaps
• 3872. Longest Arithmetic Sequence After Changing At Most One Element
• 3873. Maximum Points Activated with One Addition
• 3874. Valid Subarrays With Exactly One Peak 🔒
• 3875. Construct Uniform Parity Array I
• 3876. Construct Uniform Parity Array II
• 3877. Minimum Removals to Achieve Target XOR
• 3878. Count Good Subarrays
• 3880. Minimum Absolute Difference Between Two Values
• 3882. Minimum XOR Path in a Grid
• 3883. Count Non Decreasing Arrays With Given Digit Sums
• 3885. Design Event Manager
• 3886. Sum of Sortable Integers
• 3888. Minimum Operations to Make All Grid Elements Equal 🔒
• 3891. Minimum Increase to Maximize Special Indices
• 3892. Minimum Operations to Achieve At Least K Peaks
• 3895. Count Digit Appearances
• 3896. Minimum Operations to Transform Array into Alternating Prime
• 3897. Maximum Value of Concatenated Binary Segments
• 3898. Find the Degree of Each Vertex
• 3899. Angles of a Triangle
• 3901. Good Subsequence Queries
• 3903. Smallest Stable Index I
• 3904. Smallest Stable Index II
• 3905. Multi Source Flood Fill
• 3910. Count Connected Subgraphs with Even Node Sum
• 3912. Valid Elements in an Array
• 3914. Minimum Operations to Make Array Non Decreasing
• 3915. Maximum Sum of Alternating Subsequence With Distance at Least K
• 3917. Count Indices With Opposite Parity
• 3919. Minimum Cost to Move Between Indices
• 3923. Minimum Generations to Target Point
• 3925. Concatenate Array With Reverse
• 3927. Minimize Array Sum Using Divisible Replacements
• 3928. Minimum Cost to Buy Apples II
• 3929. Minimum Partition Score II 🔒
• 3930. Power Update After K-th Largest Insertion II 🔒
• 3933. Largest Local Values in a Matrix II
• 3934. Smallest Unique Subarray
• 3935. Power Update After K-th Largest Insertion I 🔒
• 3936. Minimum Swaps to Move Zeros to End
• 3937. Minimum Operations to Make Array Modulo Alternating I
• 3938. Maximum Path Intersection Sum in a Grid
• 3939. Count Non Adjacent Subsets in a Rooted Tree
• 3940. Limit Occurrences in Sorted Array
• 3942. Minimum Operations to Sort a Permutation
• 3943. Number of Pairs After Increment
• 3944. Minimum Operations to Make Array Modulo Alternating II 🔒
• 3946. Maximum Number of Items From Sale I
• 3947. Maximum Number of Items From Sale II
• 3948. Lexicographically Maximum MEX Array
• 3949. Subtree Inversion Sum II 🔒
• 3951. Minimum Energy to Maintain Brightness
• 3952. Maximum Total Value of Covered Indices
• 3953. Maximum Score with Co-Prime Element
• 3956. Maximum Sum of M Non-Overlapping Subarrays I
• 3957. Maximum Sum of M Non-Overlapping Subarrays II
• 3960. Frequency Balance Subarray
• 3962. Maximum Subarray Sum After at Most K Swaps
• 3964. Minimum Lights to Illuminate a Road
• 3965. Finish Time of Tasks I
• 3967. Finish Time of Tasks II 🔒
• 3969. Valid Subarrays With Matching Sum Digits I
• 3971. Maximum Total Value
• 3972. Valid Subarrays With Matching Sum Digits II 🔒
• 3973. Distinct Gate Paths to LCA 🔒
• 3974. Maximum Total Sum of K Selected Elements
• 3975. Filter Occupied Intervals
• 3976. Maximum Subarray Sum After Multiplier
• 3977. Minimum Time to Reach Target With Limited Power
• 3978. Unique Middle Element
• 3979. Maximum Valid Pair Sum
• 3982. Sum of Integers with Maximum Digit Range
• 3984. Divisible Game
• 3985. Palindromic Subarray Sum
• 3987. Minimum Total Cost to Process All Elements
• 3988. Create Grid With Exactly K Paths I
• 3989. Maximum Consistent Columns in a Grid
• 3990. Create Grid With Exactly K Paths II 🔒
• 3991. Sort Array Using Prefix Reversals 🔒
• 3994. Minimum Adjacent Swaps to Partition Array
• 3995. Minimum Cost to Convert String III
• 3996. Even Number of Knight Moves
• 4001. Aggregate Two Time Series
• 4003. Minimum Cost Path with Alternating Directions III
• 4004. Minimum Moves to Balance Circular Array II 🔒
• 4005. Minimum Operations to Make Array Equal III 🔒
• 4007. Widest Possible Fence
• 4008. Minimum Initial Strength to Defeat All Monsters
• 4009. Minimum Possible Maximum Waiting Time
• 4010. Maximize Pair Strength Using GCD
• 4011. Count Subarrays With Even Odd Ratio I
• 4012. Count of Unfinished Tasks After Each Shift
• 4013. Count Subarrays With Even Odd Ratio II
• 4015. Weighted Sum of a Tree
• 4016. Maximum Area of Two Non-Overlapping Square Submatrices
• 4017. Peaks in Array II
• 4018. Total Sum of Interaction Cost in Tree Groups II 🔒
• 4020. Elevator Requests I
• 4023. Elevator Requests II
• 4024. Nearest Available Drone
• 4025. Minimize the Maximum Waiting Time at Synchronized Traffic Lights
• 4027. Elevator Requests III

Articulation Point

• 1568. Minimum Number of Days to Disconnect Island

Backtracking

• 17. Letter Combinations of a Phone Number
• 22. Generate Parentheses
• 37. Sudoku Solver
• 39. Combination Sum
• 40. Combination Sum II
• 46. Permutations
• 47. Permutations II
• 51. N-Queens
• 52. N-Queens II
• 77. Combinations
• 78. Subsets
• 79. Word Search
• 89. Gray Code
• 90. Subsets II
• 93. Restore IP Addresses
• 95. Unique Binary Search Trees II
• 113. Path Sum II
• 126. Word Ladder II
• 131. Palindrome Partitioning
• 140. Word Break II
• 212. Word Search II
• 216. Combination Sum III
• 254. Factor Combinations 🔒
• 257. Binary Tree Paths
• 267. Palindrome Permutation II 🔒
• 282. Expression Add Operators
• 291. Word Pattern II 🔒
• 294. Flip Game II 🔒
• 301. Remove Invalid Parentheses
• 306. Additive Number
• 320. Generalized Abbreviation 🔒
• 351. Android Unlock Patterns 🔒
• 357. Count Numbers with Unique Digits
• 401. Binary Watch
• 411. Minimum Unique Word Abbreviation 🔒
• 425. Word Squares 🔒
• 465. Optimal Account Balancing 🔒
• 473. Matchsticks to Square
• 489. Robot Room Cleaner 🔒
• 491. Non-decreasing Subsequences
• 494. Target Sum
• 526. Beautiful Arrangement
• 638. Shopping Offers
• 679. 24 Game
• 681. Next Closest Time 🔒
• 691. Stickers to Spell Word
• 698. Partition to K Equal Sum Subsets
• 756. Pyramid Transition Matrix
• 773. Sliding Puzzle
• 784. Letter Case Permutation
• 797. All Paths From Source to Target
• 816. Ambiguous Coordinates
• 842. Split Array into Fibonacci Sequence
• 949. Largest Time for Given Digits
• 967. Numbers With Same Consecutive Differences
• 980. Unique Paths III
• 988. Smallest String Starting From Leaf
• 996. Number of Squareful Arrays
• 1066. Campus Bikes II 🔒
• 1079. Letter Tile Possibilities
• 1087. Brace Expansion 🔒
• 1088. Confusing Number II 🔒
• 1096. Brace Expansion II
• 1215. Stepping Numbers 🔒
• 1219. Path with Maximum Gold
• 1238. Circular Permutation in Binary Representation
• 1239. Maximum Length of a Concatenated String with Unique Characters
• 1240. Tiling a Rectangle with the Fewest Squares
• 1255. Maximum Score Words Formed by Letters
• 1258. Synonymous Sentences 🔒
• 1286. Iterator for Combination
• 1307. Verbal Arithmetic Puzzle
• 1415. The k-th Lexicographical String of All Happy Strings of Length n
• 1467. Probability of a Two Boxes Having The Same Number of Distinct Balls
• 1593. Split a String Into the Max Number of Unique Substrings
• 1601. Maximum Number of Achievable Transfer Requests
• 1655. Distribute Repeating Integers
• 1718. Construct the Lexicographically Largest Valid Sequence
• 1723. Find Minimum Time to Finish All Jobs
• 1774. Closest Dessert Cost
• 1799. Maximize Score After N Operations
• 1849. Splitting a String Into Descending Consecutive Values
• 1863. Sum of All Subset XOR Totals
• 1947. Maximum Compatibility Score Sum
• 1980. Find Unique Binary String
• 1986. Minimum Number of Work Sessions to Finish the Tasks
• 2002. Maximum Product of the Length of Two Palindromic Subsequences
• 2014. Longest Subsequence Repeated k Times
• 2044. Count Number of Maximum Bitwise-OR Subsets
• 2048. Next Greater Numerically Balanced Number
• 2056. Number of Valid Move Combinations On Chessboard
• 2065. Maximum Path Quality of a Graph
• 2151. Maximum Good People Based on Statements
• 2152. Minimum Number of Lines to Cover Points 🔒
• 2178. Maximum Split of Positive Even Integers
• 2212. Maximum Points in an Archery Competition
• 2305. Fair Distribution of Cookies
• 2375. Construct Smallest Number From DI String
• 2397. Maximum Rows Covered by Columns
• 2597. The Number of Beautiful Subsets
• 2664. The Knight’s Tour 🔒
• 2698. Find the Punishment Number of an Integer
• 2708. Maximum Strength of a Group
• 2767. Partition String Into Minimum Beautiful Substrings
• 2850. Minimum Moves to Spread Stones Over Grid
• 2992. Number of Self-Divisible Permutations 🔒
• 3211. Generate Binary Strings Without Adjacent Zeros
• 3348. Smallest Divisible Digit Product II
• 3376. Minimum Time to Break Locks I
• 3437. Permutations III 🔒
• 3646. Next Special Palindrome Number
• 3669. Balanced K-Factor Decomposition
• 3799. Word Squares II
• 3955. Valid Binary Strings With Cost Limit

Bellman–Ford

• 399. Evaluate Division
• 1334. Find the City With the Smallest Number of Neighbors at a Threshold Distance

Biconnected Component

• 1192. Critical Connections in a Network

Bidirectional Search

• 126. Word Ladder II
• 127. Word Ladder
• 433. Minimum Genetic Mutation
• 752. Open the Lock
• 773. Sliding Puzzle
• 1036. Escape a Large Maze
• 1197. Minimum Knight Moves 🔒

Binary Indexed Tree

• 218. The Skyline Problem
• 307. Range Sum Query - Mutable
• 308. Range Sum Query 2D - Mutable 🔒
• 315. Count of Smaller Numbers After Self
• 327. Count of Range Sum
• 406. Queue Reconstruction by Height
• 493. Reverse Pairs
• 673. Number of Longest Increasing Subsequence
• 683. K Empty Slots 🔒
• 1157. Online Majority Element In Subarray
• 1395. Count Number of Teams
• 1409. Queries on a Permutation With Key
• 1505. Minimum Possible Integer After at Most K Adjacent Swaps On Digits
• 1649. Create Sorted Array through Instructions
• 1964. Find the Longest Valid Obstacle Course at Each Position
• 2031. Count Subarrays With More Ones Than Zeros 🔒
• 2179. Count Good Triplets in an Array
• 2193. Minimum Number of Moves to Make Palindrome
• 2250. Count Number of Rectangles Containing Each Point
• 2286. Booking Concert Tickets in Groups
• 2407. Longest Increasing Subsequence II
• 2424. Longest Uploaded Prefix
• 2426. Number of Pairs Satisfying Inequality
• 2519. Count the Number of K-Big Indices 🔒
• 2552. Count Increasing Quadruplets
• 2659. Make Array Empty
• 2736. Maximum Sum Queries
• 2907. Maximum Profitable Triplets With Increasing Prices I 🔒
• 2916. Subarrays Distinct Element Sum of Squares II
• 2921. Maximum Profitable Triplets With Increasing Prices II 🔒
• 2926. Maximum Balanced Subsequence Sum
• 2940. Find Building Where Alice and Bob Can Meet
• 3009. Maximum Number of Intersections on the Chart 🔒
• 3072. Distribute Elements Into Two Arrays II
• 3109. Find the Index of Permutation 🔒
• 3161. Block Placement Queries
• 3187. Peaks in Array
• 3245. Alternating Groups III
• 3380. Maximum Area Rectangle With Point Constraints I
• 3382. Maximum Area Rectangle With Point Constraints II
• 3515. Shortest Path in a Weighted Tree
• 3520. Minimum Threshold for Inversion Pairs Count 🔒
• 3624. Number of Integers With Popcount-Depth Equal to K II
• 3671. Sum of Beautiful Subsequences
• 3962. Maximum Subarray Sum After at Most K Swaps
• 4011. Count Subarrays With Even Odd Ratio I
• 4013. Count Subarrays With Even Odd Ratio II

Binary Lifting

• 235. Lowest Common Ancestor of a Binary Search Tree
• 236. Lowest Common Ancestor of a Binary Tree
• 865. Smallest Subtree with all the Deepest Nodes
• 1123. Lowest Common Ancestor of Deepest Leaves
• 1257. Smallest Common Region 🔒
• 1483. Kth Ancestor of a Tree Node
• 1644. Lowest Common Ancestor of a Binary Tree II 🔒
• 1650. Lowest Common Ancestor of a Binary Tree III 🔒
• 1676. Lowest Common Ancestor of a Binary Tree IV 🔒
• 1740. Find Distance in a Binary Tree 🔒
• 2096. Step-By-Step Directions From a Binary Tree Node to Another
• 2509. Cycle Length Queries in a Tree

Binary Search

• 4. Median of Two Sorted Arrays
• 33. Search in Rotated Sorted Array
• 34. Find First and Last Position of Element in Sorted Array
• 35. Search Insert Position
• 69. Sqrt(x)
• 74. Search a 2D Matrix
• 81. Search in Rotated Sorted Array II
• 153. Find Minimum in Rotated Sorted Array
• 154. Find Minimum in Rotated Sorted Array II
• 162. Find Peak Element
• 167. Two Sum II - Input Array Is Sorted
• 209. Minimum Size Subarray Sum
• 222. Count Complete Tree Nodes
• 240. Search a 2D Matrix II
• 259. 3Sum Smaller 🔒
• 268. Missing Number
• 270. Closest Binary Search Tree Value 🔒
• 275. H-Index II
• 278. First Bad Version
• 287. Find the Duplicate Number
• 300. Longest Increasing Subsequence
• 302. Smallest Rectangle Enclosing Black Pixels 🔒
• 315. Count of Smaller Numbers After Self
• 327. Count of Range Sum
• 349. Intersection of Two Arrays
• 350. Intersection of Two Arrays II
• 352. Data Stream as Disjoint Intervals
• 354. Russian Doll Envelopes
• 362. Design Hit Counter 🔒
• 363. Max Sum of Rectangle No Larger Than K
• 367. Valid Perfect Square
• 374. Guess Number Higher or Lower
• 378. Kth Smallest Element in a Sorted Matrix
• 400. Nth Digit
• 410. Split Array Largest Sum
• 436. Find Right Interval
• 441. Arranging Coins
• 456. 132 Pattern
• 475. Heaters
• 483. Smallest Good Base
• 493. Reverse Pairs
• 497. Random Point in Non-overlapping Rectangles
• 528. Random Pick with Weight
• 532. K-diff Pairs in an Array
• 540. Single Element in a Sorted Array
• 611. Valid Triangle Number
• 633. Sum of Square Numbers
• 644. Maximum Average Subarray II 🔒
• 658. Find K Closest Elements
• 668. Kth Smallest Number in Multiplication Table
• 702. Search in a Sorted Array of Unknown Size 🔒
• 704. Binary Search
• 710. Random Pick with Blacklist
• 713. Subarray Product Less Than K
• 718. Maximum Length of Repeated Subarray
• 719. Find K-th Smallest Pair Distance
• 729. My Calendar I
• 731. My Calendar II
• 732. My Calendar III
• 744. Find Smallest Letter Greater Than Target
• 754. Reach a Number
• 774. Minimize Max Distance to Gas Station 🔒
• 778. Swim in Rising Water
• 786. K-th Smallest Prime Fraction
• 792. Number of Matching Subsequences
• 793. Preimage Size of Factorial Zeroes Function
• 825. Friends Of Appropriate Ages
• 826. Most Profit Assigning Work
• 852. Peak Index in a Mountain Array
• 862. Shortest Subarray with Sum at Least K
• 875. Koko Eating Bananas
• 878. Nth Magical Number
• 887. Super Egg Drop
• 888. Fair Candy Swap
• 902. Numbers At Most N Given Digit Set
• 911. Online Election
• 981. Time Based Key-Value Store
• 1004. Max Consecutive Ones III
• 1011. Capacity To Ship Packages Within D Days
• 1027. Longest Arithmetic Subsequence
• 1044. Longest Duplicate Substring
• 1055. Shortest Way to Form String 🔒
• 1060. Missing Element in Sorted Array 🔒
• 1062. Longest Repeating Substring 🔒
• 1064. Fixed Point 🔒
• 1095. Find in Mountain Array
• 1099. Two Sum Less Than K 🔒
• 1102. Path With Maximum Minimum Value 🔒
• 1146. Snapshot Array
• 1150. Check If a Number Is Majority Element in a Sorted Array 🔒
• 1157. Online Majority Element In Subarray
• 1170. Compare Strings by Frequency of the Smallest Character
• 1182. Shortest Distance to Target Color 🔒
• 1187. Make Array Strictly Increasing
• 1198. Find Smallest Common Element in All Rows 🔒
• 1201. Ugly Number III
• 1208. Get Equal Substrings Within Budget
• 1213. Intersection of Three Sorted Arrays 🔒
• 1214. Two Sum BSTs 🔒
• 1231. Divide Chocolate 🔒
• 1235. Maximum Profit in Job Scheduling
• 1237. Find Positive Integer Solution for a Given Equation
• 1268. Search Suggestions System
• 1283. Find the Smallest Divisor Given a Threshold
• 1292. Maximum Side Length of a Square with Sum Less than or Equal to Threshold
• 1300. Sum of Mutated Array Closest to Target
• 1337. The K Weakest Rows in a Matrix
• 1346. Check If N and Its Double Exist
• 1348. Tweet Counts Per Frequency
• 1351. Count Negative Numbers in a Sorted Matrix
• 1385. Find the Distance Value Between Two Arrays
• 1428. Leftmost Column with at Least a One 🔒
• 1439. Find the Kth Smallest Sum of a Matrix With Sorted Rows
• 1477. Find Two Non-overlapping Sub-arrays Each With Target Sum
• 1482. Minimum Number of Days to Make m Bouquets
• 1483. Kth Ancestor of a Tree Node
• 1488. Avoid Flood in The City
• 1498. Number of Subsequences That Satisfy the Given Sum Condition
• 1508. Range Sum of Sorted Subarray Sums
• 1521. Find a Value of a Mysterious Function Closest to Target
• 1533. Find the Index of the Large Integer 🔒
• 1539. Kth Missing Positive Number
• 1552. Magnetic Force Between Two Balls
• 1562. Find Latest Group of Size M
• 1574. Shortest Subarray to be Removed to Make Array Sorted
• 1608. Special Array With X Elements Greater Than or Equal X
• 1618. Maximum Font to Fit a Sentence in a Screen 🔒
• 1631. Path With Minimum Effort
• 1648. Sell Diminishing-Valued Colored Balls
• 1649. Create Sorted Array through Instructions
• 1658. Minimum Operations to Reduce X to Zero
• 1671. Minimum Number of Removals to Make Mountain Array
• 1712. Ways to Split Array Into Three Subarrays
• 1713. Minimum Operations to Make a Subsequence
• 1739. Building Boxes
• 1751. Maximum Number of Events That Can Be Attended II
• 1760. Minimum Limit of Balls in a Bag
• 1782. Count Pairs Of Nodes
• 1793. Maximum Score of a Good Subarray
• 1802. Maximum Value at a Given Index in a Bounded Array
• 1818. Minimum Absolute Sum Difference
• 1838. Frequency of the Most Frequent Element
• 1847. Closest Room
• 1851. Minimum Interval to Include Each Query
• 1855. Maximum Distance Between a Pair of Values
• 1862. Sum of Floored Pairs
• 1870. Minimum Speed to Arrive on Time
• 1885. Count Pairs in Two Arrays 🔒
• 1889. Minimum Space Wasted From Packaging
• 1891. Cutting Ribbons 🔒
• 1894. Find the Student that Will Replace the Chalk
• 1898. Maximum Number of Removable Characters
• 1901. Find a Peak Element II
• 1918. Kth Smallest Subarray Sum 🔒
• 1923. Longest Common Subpath
• 1954. Minimum Garden Perimeter to Collect Enough Apples
• 1956. Minimum Time For K Virus Variants to Spread 🔒
• 1964. Find the Longest Valid Obstacle Course at Each Position
• 1966. Binary Searchable Numbers in an Unsorted Array 🔒
• 1970. Last Day Where You Can Still Cross
• 2008. Maximum Earnings From Taxi
• 2009. Minimum Number of Operations to Make Array Continuous
• 2024. Maximize the Confusion of an Exam
• 2031. Count Subarrays With More Ones Than Zeros 🔒
• 2035. Partition Array Into Two Arrays to Minimize Sum Difference
• 2040. Kth Smallest Product of Two Sorted Arrays
• 2054. Two Best Non-Overlapping Events
• 2055. Plates Between Candles
• 2064. Minimized Maximum of Products Distributed to Any Store
• 2070. Most Beautiful Item for Each Query
• 2071. Maximum Number of Tasks You Can Assign
• 2080. Range Frequency Queries
• 2089. Find Target Indices After Sorting Array
• 2106. Maximum Fruits Harvested After at Most K Steps
• 2111. Minimum Operations to Make the Array K-Increasing
• 2137. Pour Water Between Buckets to Make Water Levels Equal 🔒
• 2141. Maximum Running Time of N Computers
• 2179. Count Good Triplets in an Array
• 2187. Minimum Time to Complete Trips
• 2223. Sum of Scores of Built Strings
• 2226. Maximum Candies Allocated to K Children
• 2234. Maximum Total Beauty of the Gardens
• 2250. Count Number of Rectangles Containing Each Point
• 2251. Number of Flowers in Full Bloom
• 2258. Escape the Spreading Fire
• 2271. Maximum White Tiles Covered by a Carpet
• 2286. Booking Concert Tickets in Groups
• 2300. Successful Pairs of Spells and Potions
• 2302. Count Subarrays With Score Less Than K
• 2332. The Latest Time to Catch a Bus
• 2333. Minimum Sum of Squared Difference
• 2354. Number of Excellent Pairs
• 2358. Maximum Number of Groups Entering a Competition
• 2387. Median of a Row Wise Sorted Matrix 🔒
• 2389. Longest Subsequence With Limited Sum
• 2398. Maximum Number of Robots Within Budget
• 2411. Smallest Subarrays With Maximum Bitwise OR
• 2424. Longest Uploaded Prefix
• 2426. Number of Pairs Satisfying Inequality
• 2439. Minimize Maximum of Array
• 2448. Minimum Cost to Make Array Equal
• 2454. Next Greater Element IV
• 2476. Closest Nodes Queries in a Binary Search Tree
• 2498. Frog Jump II
• 2501. Longest Square Streak in an Array
• 2513. Minimize the Maximum of Two Arrays
• 2517. Maximum Tastiness of Candy Basket
• 2519. Count the Number of K-Big Indices 🔒
• 2528. Maximize the Minimum Powered City
• 2529. Maximum Count of Positive Integer and Negative Integer
• 2540. Minimum Common Value
• 2554. Maximum Number of Integers to Choose From a Range I
• 2555. Maximize Win From Two Segments
• 2557. Maximum Number of Integers to Choose From a Range II 🔒
• 2560. House Robber IV
• 2563. Count the Number of Fair Pairs
• 2565. Subsequence With the Minimum Score
• 2576. Find the Maximum Number of Marked Indices
• 2589. Minimum Time to Complete All Tasks
• 2594. Minimum Time to Repair Cars
• 2601. Prime Subtraction Operation
• 2602. Minimum Operations to Make All Array Elements Equal
• 2604. Minimum Time to Eat All Grains 🔒
• 2616. Minimize the Maximum Difference of Pairs
• 2659. Make Array Empty
• 2702. Minimum Operations to Make Numbers Non-positive 🔒
• 2713. Maximum Strictly Increasing Cells in a Matrix
• 2736. Maximum Sum Queries
• 2779. Maximum Beauty of an Array After Applying Operation
• 2790. Maximum Number of Groups With Increasing Length
• 2812. Find the Safest Path in a Grid
• 2817. Minimum Absolute Difference Between Elements With Constraint
• 2819. Minimum Relative Loss After Buying Chocolates 🔒
• 2824. Count Pairs Whose Sum is Less than Target
• 2826. Sorting Three Groups
• 2830. Maximize the Profit as the Salesman
• 2831. Find the Longest Equal Subarray
• 2838. Maximum Coins Heroes Can Collect 🔒
• 2856. Minimum Array Length After Pair Removals
• 2861. Maximum Number of Alloys
• 2926. Maximum Balanced Subsequence Sum
• 2936. Number of Equal Numbers Blocks 🔒
• 2940. Find Building Where Alice and Bob Can Meet
• 2941. Maximum GCD-Sum of a Subarray 🔒
• 2945. Find Maximum Non-decreasing Array Length
• 2967. Minimum Cost to Make Array Equalindromic
• 2968. Apply Operations to Maximize Frequency Score
• 2970. Count the Number of Incremovable Subarrays I
• 2972. Count the Number of Incremovable Subarrays II
• 2981. Find Longest Special Substring That Occurs Thrice I
• 2982. Find Longest Special Substring That Occurs Thrice II
• 3006. Find Beautiful Indices in the Given Array I
• 3007. Maximum Number That Sum of the Prices Is Less Than or Equal to K
• 3008. Find Beautiful Indices in the Given Array II
• 3048. Earliest Second to Mark Indices I
• 3049. Earliest Second to Mark Indices II
• 3109. Find the Index of Permutation 🔒
• 3113. Find the Number of Subarrays Where Boundary Elements Are Maximum
• 3116. Kth Smallest Amount With Single Denomination Combination
• 3117. Minimum Sum of Values by Dividing Array
• 3134. Find the Median of the Uniqueness Array
• 3135. Equalize Strings by Adding or Removing Characters at Ends 🔒
• 3143. Maximum Points Inside the Square
• 3145. Find Products of Elements of Big Array
• 3152. Special Array II
• 3155. Maximum Number of Upgradable Servers 🔒
• 3161. Block Placement Queries
• 3171. Find Subarray With Bitwise OR Closest to K
• 3186. Maximum Total Damage With Spell Casting
• 3209. Number of Subarrays With AND Value of K
• 3231. Minimum Number of Increasing Subsequence to Be Removed 🔒
• 3261. Count Substrings That Satisfy K-Constraint II
• 3281. Maximize Score of Numbers in Ranges
• 3288. Length of the Longest Increasing Path
• 3291. Minimum Number of Valid Strings to Form Target I
• 3292. Minimum Number of Valid Strings to Form Target II
• 3296. Minimum Number of Seconds to Make Mountain Height Zero
• 3312. Sorted GCD Pair Queries
• 3323. Minimize Connected Groups by Inserting Interval 🔒
• 3344. Maximum Sized Array 🔒
• 3346. Maximum Frequency of an Element After Performing Operations I
• 3347. Maximum Frequency of an Element After Performing Operations II
• 3350. Adjacent Increasing Subarrays Detection II
• 3356. Zero Array Transformation II
• 3357. Minimize the Maximum Adjacent Element Difference
• 3369. Design an Array Statistics Tracker 🔒
• 3398. Smallest Substring With Identical Characters I
• 3399. Smallest Substring With Identical Characters II
• 3413. Maximum Coins From K Consecutive Bags
• 3414. Maximum Score of Non-overlapping Intervals
• 3419. Minimize the Maximum Edge Weight of Graph
• 3449. Maximize the Minimum Game Score
• 3453. Separate Squares I
• 3454. Separate Squares II
• 3455. Shortest Matching Substring
• 3464. Maximize the Distance Between Points on a Square
• 3477. Fruits Into Baskets II
• 3479. Fruits Into Baskets III
• 3488. Closest Equal Element Queries
• 3501. Maximize Active Section with Trade II
• 3508. Implement Router
• 3520. Minimum Threshold for Inversion Pairs Count 🔒
• 3532. Path Existence Queries in a Graph I
• 3534. Path Existence Queries in a Graph II
• 3585. Find Weighted Median Node in Tree
• 3600. Maximize Spanning Tree Stability with Upgrades
• 3605. Minimum Stability Factor of Array
• 3608. Minimum Time for K Connected Components
• 3613. Minimize Maximum Component Cost
• 3620. Network Recovery Pathways
• 3633. Earliest Finish Time for Land and Water Rides I
• 3634. Minimum Removals to Balance Array
• 3635. Earliest Finish Time for Land and Water Rides II
• 3636. Threshold Majority Queries
• 3639. Minimum Time to Activate String
• 3656. Determine if a Simple Graph Exists 🔒
• 3661. Maximum Walls Destroyed by Robots
• 3709. Design Exam Scores Tracker
• 3710. Maximum Partition Factor
• 3722. Lexicographically Smallest String After Reverse
• 3733. Minimum Time to Complete All Deliveries
• 3735. Lexicographically Smallest String After Reverse II 🔒
• 3748. Count Stable Subarrays
• 3759. Count Elements With at Least K Greater Values
• 3762. Minimum Operations to Equalize Subarrays
• 3766. Minimum Operations to Make Binary Palindrome
• 3771. Total Score of Dungeon Runs
• 3801. Minimum Cost to Merge Sorted Lists
• 3807. Minimum Cost to Repair Edges to Traverse a Graph 🔒
• 3814. Maximum Capacity Within Budget
• 3824. Minimum K to Reduce Array Within Limit
• 3896. Minimum Operations to Transform Array into Alternating Prime
• 3929. Minimum Partition Score II 🔒
• 3932. Count K-th Roots in a Range
• 3934. Smallest Unique Subarray
• 3956. Maximum Sum of M Non-Overlapping Subarrays I
• 3957. Maximum Sum of M Non-Overlapping Subarrays II
• 3971. Maximum Total Value
• 3985. Palindromic Subarray Sum
• 4008. Minimum Initial Strength to Defeat All Monsters
• 4012. Count of Unfinished Tasks After Each Shift
• 4016. Maximum Area of Two Non-Overlapping Square Submatrices
• 4022. K-th Digit in Infinite String

Binary Search Tree

• 95. Unique Binary Search Trees II
• 96. Unique Binary Search Trees
• 98. Validate Binary Search Tree
• 99. Recover Binary Search Tree
• 108. Convert Sorted Array to Binary Search Tree
• 109. Convert Sorted List to Binary Search Tree
• 173. Binary Search Tree Iterator
• 230. Kth Smallest Element in a BST
• 235. Lowest Common Ancestor of a Binary Search Tree
• 255. Verify Preorder Sequence in Binary Search Tree 🔒
• 270. Closest Binary Search Tree Value 🔒
• 272. Closest Binary Search Tree Value II 🔒
• 285. Inorder Successor in BST 🔒
• 333. Largest BST Subtree 🔒
• 426. Convert Binary Search Tree to Sorted Doubly Linked List 🔒
• 449. Serialize and Deserialize BST
• 450. Delete Node in a BST
• 501. Find Mode in Binary Search Tree
• 510. Inorder Successor in BST II 🔒
• 530. Minimum Absolute Difference in BST
• 538. Convert BST to Greater Tree
• 653. Two Sum IV - Input is a BST
• 669. Trim a Binary Search Tree
• 700. Search in a Binary Search Tree
• 701. Insert into a Binary Search Tree
• 703. Kth Largest Element in a Stream
• 776. Split BST 🔒
• 783. Minimum Distance Between BST Nodes
• 897. Increasing Order Search Tree
• 938. Range Sum of BST
• 1008. Construct Binary Search Tree from Preorder Traversal
• 1038. Binary Search Tree to Greater Sum Tree
• 1214. Two Sum BSTs 🔒
• 1305. All Elements in Two Binary Search Trees
• 1373. Maximum Sum BST in Binary Tree
• 1382. Balance a Binary Search Tree
• 1569. Number of Ways to Reorder Array to Get Same BST
• 1586. Binary Search Tree Iterator II 🔒
• 1902. Depth of BST Given Insertion Order 🔒
• 1932. Merge BSTs to Create Single BST
• 2476. Closest Nodes Queries in a Binary Search Tree
• 3526. Range XOR Queries with Subarray Reversals 🔒
• 3831. Median of a Binary Search Tree Level 🔒

Binary Tree

• 94. Binary Tree Inorder Traversal
• 95. Unique Binary Search Trees II
• 96. Unique Binary Search Trees
• 98. Validate Binary Search Tree
• 99. Recover Binary Search Tree
• 100. Same Tree
• 101. Symmetric Tree
• 102. Binary Tree Level Order Traversal
• 103. Binary Tree Zigzag Level Order Traversal
• 104. Maximum Depth of Binary Tree
• 105. Construct Binary Tree from Preorder and Inorder Traversal
• 106. Construct Binary Tree from Inorder and Postorder Traversal
• 107. Binary Tree Level Order Traversal II
• 108. Convert Sorted Array to Binary Search Tree
• 109. Convert Sorted List to Binary Search Tree
• 110. Balanced Binary Tree
• 111. Minimum Depth of Binary Tree
• 112. Path Sum
• 113. Path Sum II
• 114. Flatten Binary Tree to Linked List
• 116. Populating Next Right Pointers in Each Node
• 117. Populating Next Right Pointers in Each Node II
• 124. Binary Tree Maximum Path Sum
• 129. Sum Root to Leaf Numbers
• 144. Binary Tree Preorder Traversal
• 145. Binary Tree Postorder Traversal
• 156. Binary Tree Upside Down 🔒
• 173. Binary Search Tree Iterator
• 199. Binary Tree Right Side View
• 222. Count Complete Tree Nodes
• 226. Invert Binary Tree
• 230. Kth Smallest Element in a BST
• 235. Lowest Common Ancestor of a Binary Search Tree
• 236. Lowest Common Ancestor of a Binary Tree
• 250. Count Univalue Subtrees 🔒
• 255. Verify Preorder Sequence in Binary Search Tree 🔒
• 257. Binary Tree Paths
• 270. Closest Binary Search Tree Value 🔒
• 272. Closest Binary Search Tree Value II 🔒
• 285. Inorder Successor in BST 🔒
• 297. Serialize and Deserialize Binary Tree
• 298. Binary Tree Longest Consecutive Sequence 🔒
• 314. Binary Tree Vertical Order Traversal 🔒
• 331. Verify Preorder Serialization of a Binary Tree
• 333. Largest BST Subtree 🔒
• 337. House Robber III
• 366. Find Leaves of Binary Tree 🔒
• 404. Sum of Left Leaves
• 426. Convert Binary Search Tree to Sorted Doubly Linked List 🔒
• 431. Encode N-ary Tree to Binary Tree 🔒
• 437. Path Sum III
• 449. Serialize and Deserialize BST
• 450. Delete Node in a BST
• 501. Find Mode in Binary Search Tree
• 508. Most Frequent Subtree Sum
• 510. Inorder Successor in BST II 🔒
• 513. Find Bottom Left Tree Value
• 515. Find Largest Value in Each Tree Row
• 530. Minimum Absolute Difference in BST
• 536. Construct Binary Tree from String 🔒
• 538. Convert BST to Greater Tree
• 543. Diameter of Binary Tree
• 545. Boundary of Binary Tree 🔒
• 549. Binary Tree Longest Consecutive Sequence II 🔒
• 563. Binary Tree Tilt
• 572. Subtree of Another Tree
• 606. Construct String from Binary Tree
• 617. Merge Two Binary Trees
• 623. Add One Row to Tree
• 637. Average of Levels in Binary Tree
• 652. Find Duplicate Subtrees
• 653. Two Sum IV - Input is a BST
• 654. Maximum Binary Tree
• 655. Print Binary Tree
• 662. Maximum Width of Binary Tree
• 663. Equal Tree Partition 🔒
• 666. Path Sum IV 🔒
• 669. Trim a Binary Search Tree
• 671. Second Minimum Node In a Binary Tree
• 687. Longest Univalue Path
• 700. Search in a Binary Search Tree
• 701. Insert into a Binary Search Tree
• 703. Kth Largest Element in a Stream
• 742. Closest Leaf in a Binary Tree 🔒
• 776. Split BST 🔒
• 783. Minimum Distance Between BST Nodes
• 814. Binary Tree Pruning
• 863. All Nodes Distance K in Binary Tree
• 865. Smallest Subtree with all the Deepest Nodes
• 872. Leaf-Similar Trees
• 889. Construct Binary Tree from Preorder and Postorder Traversal
• 894. All Possible Full Binary Trees
• 897. Increasing Order Search Tree
• 919. Complete Binary Tree Inserter
• 938. Range Sum of BST
• 951. Flip Equivalent Binary Trees
• 958. Check Completeness of a Binary Tree
• 965. Univalued Binary Tree
• 968. Binary Tree Cameras
• 971. Flip Binary Tree To Match Preorder Traversal
• 979. Distribute Coins in Binary Tree
• 987. Vertical Order Traversal of a Binary Tree
• 988. Smallest String Starting From Leaf
• 993. Cousins in Binary Tree
• 998. Maximum Binary Tree II
• 1008. Construct Binary Search Tree from Preorder Traversal
• 1022. Sum of Root To Leaf Binary Numbers
• 1026. Maximum Difference Between Node and Ancestor
• 1028. Recover a Tree From Preorder Traversal
• 1038. Binary Search Tree to Greater Sum Tree
• 1080. Insufficient Nodes in Root to Leaf Paths
• 1104. Path In Zigzag Labelled Binary Tree
• 1110. Delete Nodes And Return Forest
• 1120. Maximum Average Subtree 🔒
• 1123. Lowest Common Ancestor of Deepest Leaves
• 1145. Binary Tree Coloring Game
• 1161. Maximum Level Sum of a Binary Tree
• 1214. Two Sum BSTs 🔒
• 1261. Find Elements in a Contaminated Binary Tree
• 1302. Deepest Leaves Sum
• 1305. All Elements in Two Binary Search Trees
• 1315. Sum of Nodes with Even-Valued Grandparent
• 1325. Delete Leaves With a Given Value
• 1339. Maximum Product of Splitted Binary Tree
• 1361. Validate Binary Tree Nodes
• 1367. Linked List in Binary Tree
• 1372. Longest ZigZag Path in a Binary Tree
• 1373. Maximum Sum BST in Binary Tree
• 1379. Find a Corresponding Node of a Binary Tree in a Clone of That Tree
• 1382. Balance a Binary Search Tree
• 1430. Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree 🔒
• 1448. Count Good Nodes in Binary Tree
• 1457. Pseudo-Palindromic Paths in a Binary Tree
• 1469. Find All The Lonely Nodes 🔒
• 1485. Clone Binary Tree With Random Pointer 🔒
• 1530. Number of Good Leaf Nodes Pairs
• 1569. Number of Ways to Reorder Array to Get Same BST
• 1586. Binary Search Tree Iterator II 🔒
• 1597. Build Binary Expression Tree From Infix Expression 🔒
• 1602. Find Nearest Right Node in Binary Tree 🔒
• 1609. Even Odd Tree
• 1612. Check If Two Expression Trees are Equivalent 🔒
• 1628. Design an Expression Tree With Evaluate Function 🔒
• 1644. Lowest Common Ancestor of a Binary Tree II 🔒
• 1650. Lowest Common Ancestor of a Binary Tree III 🔒
• 1660. Correct a Binary Tree 🔒
• 1666. Change the Root of a Binary Tree 🔒
• 1676. Lowest Common Ancestor of a Binary Tree IV 🔒
• 1740. Find Distance in a Binary Tree 🔒
• 1902. Depth of BST Given Insertion Order 🔒
• 1932. Merge BSTs to Create Single BST
• 1973. Count Nodes Equal to Sum of Descendants 🔒
• 2005. Subtree Removal Game with Fibonacci Tree 🔒
• 2049. Count Nodes With the Highest Score
• 2096. Step-By-Step Directions From a Binary Tree Node to Another
• 2196. Create Binary Tree From Descriptions
• 2236. Root Equals Sum of Children
• 2265. Count Nodes Equal to Average of Subtree
• 2313. Minimum Flips in Binary Tree to Get Result 🔒
• 2331. Evaluate Boolean Binary Tree
• 2385. Amount of Time for Binary Tree to Be Infected
• 2415. Reverse Odd Levels of Binary Tree
• 2445. Number of Nodes With Value One 🔒
• 2458. Height of Binary Tree After Subtree Removal Queries
• 2471. Minimum Number of Operations to Sort a Binary Tree by Level
• 2476. Closest Nodes Queries in a Binary Search Tree
• 2509. Cycle Length Queries in a Tree
• 2583. Kth Largest Sum in a Binary Tree
• 2641. Cousins in Binary Tree II
• 2673. Make Costs of Paths Equal in a Binary Tree
• 2689. Extract Kth Character From The Rope Tree 🔒
• 2764. Is Array a Preorder of Some ‌Binary Tree 🔒
• 2773. Height of Special Binary Tree 🔒
• 2792. Count Nodes That Are Great Enough 🔒
• 3157. Find the Level of Tree with Minimum Sum 🔒
• 3319. K-th Largest Perfect Subtree Size in Binary Tree
• 3526. Range XOR Queries with Subarray Reversals 🔒
• 3831. Median of a Binary Search Tree Level 🔒
• 3879. Maximum Distinct Path Sum in a Binary Tree 🔒
• 3902. Zigzag Level Sum of Binary Tree 🔒
• 3997. Count Dominant Nodes in a Binary Tree

Bipartite Graph

• 785. Is Graph Bipartite
• 886. Possible Bipartition
• 947. Most Stones Removed with Same Row or Column
• 1066. Campus Bikes II 🔒
• 1349. Maximum Students Taking Exam
• 1434. Number of Ways to Wear Different Hats to Each Other
• 1595. Minimum Cost to Connect Two Groups of Points
• 1820. Maximum Number of Accepted Invitations 🔒
• 1879. Minimum XOR Sum of Two Arrays
• 1947. Maximum Compatibility Score Sum

Bit Manipulation

• 29. Divide Two Integers
• 67. Add Binary
• 78. Subsets
• 89. Gray Code
• 90. Subsets II
• 136. Single Number
• 137. Single Number II
• 187. Repeated DNA Sequences
• 190. Reverse Bits
• 191. Number of 1 Bits
• 201. Bitwise AND of Numbers Range
• 222. Count Complete Tree Nodes
• 231. Power of Two
• 260. Single Number III
• 266. Palindrome Permutation 🔒
• 268. Missing Number
• 287. Find the Duplicate Number
• 318. Maximum Product of Word Lengths
• 320. Generalized Abbreviation 🔒
• 338. Counting Bits
• 342. Power of Four
• 351. Android Unlock Patterns 🔒
• 371. Sum of Two Integers
• 389. Find the Difference
• 393. UTF-8 Validation
• 397. Integer Replacement
• 401. Binary Watch
• 405. Convert a Number to Hexadecimal
• 411. Minimum Unique Word Abbreviation 🔒
• 421. Maximum XOR of Two Numbers in an Array
• 461. Hamming Distance
• 464. Can I Win
• 465. Optimal Account Balancing 🔒
• 473. Matchsticks to Square
• 476. Number Complement
• 477. Total Hamming Distance
• 491. Non-decreasing Subsequences
• 526. Beautiful Arrangement
• 638. Shopping Offers
• 645. Set Mismatch
• 672. Bulb Switcher II
• 691. Stickers to Spell Word
• 693. Binary Number with Alternating Bits
• 698. Partition to K Equal Sum Subsets
• 751. IP to CIDR 🔒
• 756. Pyramid Transition Matrix
• 762. Prime Number of Set Bits in Binary Representation
• 779. K-th Symbol in Grammar
• 782. Transform to Chessboard
• 784. Letter Case Permutation
• 805. Split Array With Same Average
• 810. Chalkboard XOR Game
• 832. Flipping an Image
• 847. Shortest Path Visiting All Nodes
• 861. Score After Flipping Matrix
• 864. Shortest Path to Get All Keys
• 868. Binary Gap
• 898. Bitwise ORs of Subarrays
• 943. Find the Shortest Superstring
• 957. Prison Cells After N Days
• 980. Unique Paths III
• 982. Triples with Bitwise AND Equal To Zero
• 995. Minimum Number of K Consecutive Bit Flips
• 996. Number of Squareful Arrays
• 1009. Complement of Base 10 Integer
• 1016. Binary String With Substrings Representing 1 To N
• 1018. Binary Prefix Divisible By 5
• 1066. Campus Bikes II 🔒
• 1125. Smallest Sufficient Team
• 1177. Can Make Palindrome from Substring
• 1178. Number of Valid Words for Each Puzzle
• 1238. Circular Permutation in Binary Representation
• 1239. Maximum Length of a Concatenated String with Unique Characters
• 1255. Maximum Score Words Formed by Letters
• 1256. Encode Number 🔒
• 1284. Minimum Number of Flips to Convert Binary Matrix to Zero Matrix
• 1310. XOR Queries of a Subarray
• 1318. Minimum Flips to Make a OR b Equal to c
• 1342. Number of Steps to Reduce a Number to Zero
• 1349. Maximum Students Taking Exam
• 1356. Sort Integers by The Number of 1 Bits
• 1371. Find the Longest Substring Containing Vowels in Even Counts
• 1386. Cinema Seat Allocation
• 1404. Number of Steps to Reduce a Number in Binary Representation to One
• 1434. Number of Ways to Wear Different Hats to Each Other
• 1442. Count Triplets That Can Form Two Arrays of Equal XOR
• 1457. Pseudo-Palindromic Paths in a Binary Tree
• 1461. Check If a String Contains All Binary Codes of Size K
• 1483. Kth Ancestor of a Tree Node
• 1486. XOR Operation in an Array
• 1494. Parallel Courses II
• 1506. Find Root of N-Ary Tree 🔒
• 1521. Find a Value of a Mysterious Function Closest to Target
• 1525. Number of Good Ways to Split a String
• 1542. Find Longest Awesome Substring
• 1558. Minimum Numbers of Function Calls to Make Target Array
• 1595. Minimum Cost to Connect Two Groups of Points
• 1601. Maximum Number of Achievable Transfer Requests
• 1611. Minimum One Bit Operations to Make Integers Zero
• 1617. Count Subtrees With Max Distance Between Cities
• 1655. Distribute Repeating Integers
• 1659. Maximize Grid Happiness
• 1680. Concatenation of Consecutive Binary Numbers
• 1681. Minimum Incompatibility
• 1684. Count the Number of Consistent Strings
• 1707. Maximum XOR With an Element From Array
• 1720. Decode XORed Array
• 1723. Find Minimum Time to Finish All Jobs
• 1734. Decode XORed Permutation
• 1738. Find Kth Largest XOR Coordinate Value
• 1755. Closest Subsequence Sum
• 1763. Longest Nice Substring
• 1787. Make the XOR of All Segments Equal to Zero
• 1799. Maximize Score After N Operations
• 1803. Count Pairs With XOR in a Range
• 1815. Maximum Number of Groups Getting Fresh Donuts
• 1829. Maximum XOR for Each Query
• 1835. Find XOR Sum of All Pairs Bitwise AND
• 1863. Sum of All Subset XOR Totals
• 1879. Minimum XOR Sum of Two Arrays
• 1908. Game of Nim 🔒
• 1915. Number of Wonderful Substrings
• 1930. Unique Length-3 Palindromic Subsequences
• 1938. Maximum Genetic Difference Query
• 1947. Maximum Compatibility Score Sum
• 1986. Minimum Number of Work Sessions to Finish the Tasks
• 1994. The Number of Good Subsets
• 2002. Maximum Product of the Length of Two Palindromic Subsequences
• 2032. Two Out of Three
• 2035. Partition Array Into Two Arrays to Minimize Sum Difference
• 2044. Count Number of Maximum Bitwise-OR Subsets
• 2128. Remove All Ones With Row and Column Flips 🔒
• 2135. Count Words Obtained After Adding a Letter
• 2151. Maximum Good People Based on Statements
• 2152. Minimum Number of Lines to Cover Points 🔒
• 2157. Groups of Strings
• 2172. Maximum AND Sum of Array
• 2174. Remove All Ones With Row and Column Flips II 🔒
• 2184. Number of Ways to Build Sturdy Brick Wall 🔒
• 2206. Divide Array Into Equal Pairs
• 2212. Maximum Points in an Archery Competition
• 2220. Minimum Bit Flips to Convert Number
• 2247. Maximum Cost of Trip With K Highways 🔒
• 2275. Largest Combination With Bitwise AND Greater Than Zero
• 2305. Fair Distribution of Cookies
• 2306. Naming a Company
• 2317. Maximum XOR After Operations
• 2322. Minimum Score After Removals on a Tree
• 2351. First Letter to Appear Twice
• 2354. Number of Excellent Pairs
• 2397. Maximum Rows Covered by Columns
• 2401. Longest Nice Subarray
• 2403. Minimum Time to Kill All Monsters 🔒
• 2411. Smallest Subarrays With Maximum Bitwise OR
• 2419. Longest Subarray With Maximum Bitwise AND
• 2425. Bitwise XOR of All Pairings
• 2429. Minimize XOR
• 2433. Find The Original Array of Prefix Xor
• 2438. Range Product Queries of Powers
• 2505. Bitwise OR of All Subsequence Sums 🔒
• 2506. Count Pairs Of Similar Strings
• 2527. Find Xor-Beauty of Array
• 2546. Apply Bitwise Operations to Make Strings Equal
• 2564. Substring XOR Queries
• 2568. Minimum Impossible OR
• 2571. Minimum Operations to Reduce an Integer to 0
• 2572. Count the Number of Square-Free Subsets
• 2588. Count the Number of Beautiful Subarrays
• 2595. Number of Even and Odd Bits
• 2657. Find the Prefix Common Array of Two Arrays
• 2680. Maximum OR
• 2683. Neighboring Bitwise XOR
• 2708. Maximum Strength of a Group
• 2732. Find a Good Subset of the Matrix
• 2741. Special Permutations
• 2749. Minimum Operations to Make the Integer Zero
• 2791. Count Paths That Can Form a Palindrome in a Tree
• 2802. Find The K-th Lucky Number 🔒
• 2835. Minimum Operations to Form Subsequence With Target Sum
• 2836. Maximize Value of Function in a Ball Passing Game
• 2846. Minimum Edge Weight Equilibrium Queries in a Tree
• 2850. Minimum Moves to Spread Stones Over Grid
• 2857. Count Pairs of Points With Distance k
• 2859. Sum of Values at Indices With K Set Bits
• 2869. Minimum Operations to Collect Elements
• 2871. Split Array Into Maximum Number of Subarrays
• 2897. Apply Operations on Array to Maximize Sum of Squares
• 2917. Find the K-or of an Array
• 2920. Maximum Points After Collecting Coins From All Nodes
• 2932. Maximum Strong Pair XOR I
• 2935. Maximum Strong Pair XOR II
• 2939. Maximum Xor Product
• 2959. Number of Possible Sets of Closing Branches
• 2980. Check if Bitwise OR Has Trailing Zeros
• 2992. Number of Self-Divisible Permutations 🔒
• 2997. Minimum Number of Operations to Make Array XOR Equal to K
• 3003. Maximize the Number of Partitions After Operations
• 3007. Maximum Number That Sum of the Prices Is Less Than or Equal to K
• 3011. Find if Array Can Be Sorted
• 3022. Minimize OR of Remaining Elements Using Operations
• 3064. Guess the Number Using Bitwise Questions I 🔒
• 3068. Find the Maximum Sum of Node Values
• 3094. Guess the Number Using Bitwise Questions II 🔒
• 3095. Shortest Subarray With OR at Least K I
• 3097. Shortest Subarray With OR at Least K II
• 3108. Minimum Cost Walk in Weighted Graph
• 3116. Kth Smallest Amount With Single Denomination Combination
• 3117. Minimum Sum of Values by Dividing Array
• 3133. Minimum Array End
• 3141. Maximum Hamming Distances 🔒
• 3145. Find Products of Elements of Big Array
• 3149. Find the Minimum Cost Array Permutation
• 3154. Find Number of Ways to Reach the K-th Stair
• 3158. Find the XOR of Numbers Which Appear Twice
• 3171. Find Subarray With Bitwise OR Closest to K
• 3173. Bitwise OR of Adjacent Elements 🔒
• 3180. Maximum Total Reward Using Operations I
• 3181. Maximum Total Reward Using Operations II
• 3191. Minimum Operations to Make Binary Array Elements Equal to One I
• 3199. Count Triplets with Even XOR Set Bits I 🔒
• 3209. Number of Subarrays With AND Value of K
• 3211. Generate Binary Strings Without Adjacent Zeros
• 3215. Count Triplets with Even XOR Set Bits II 🔒
• 3226. Number of Bit Changes to Make Two Integers Equal
• 3276. Select Cells in Grid With Maximum Score
• 3283. Maximum Number of Moves to Kill All Pawns
• 3287. Find the Maximum Sequence Value of Array
• 3304. Find the K-th Character in String Game I
• 3307. Find the K-th Character in String Game II
• 3309. Maximum Possible Number by Binary Concatenation
• 3314. Construct the Minimum Bitwise Array I
• 3315. Construct the Minimum Bitwise Array II
• 3344. Maximum Sized Array 🔒
• 3370. Smallest Number With All Set Bits
• 3376. Minimum Time to Break Locks I
• 3393. Count Paths With the Given XOR Value
• 3435. Frequencies of Shortest Supersequences
• 3444. Minimum Increments for Target Multiples in an Array
• 3495. Minimum Operations to Make Array Elements Zero
• 3513. Number of Unique XOR Triplets I
• 3514. Number of Unique XOR Triplets II
• 3530. Maximum Profit from Valid Topological Order in DAG
• 3533. Concatenated Divisibility
• 3534. Path Existence Queries in a Graph II
• 3539. Find Sum of Array Product of Magical Sequences
• 3553. Minimum Weighted Subgraph With the Required Paths II
• 3559. Number of Ways to Assign Edge Weights II
• 3566. Partition Array into Two Equal Product Subsets
• 3568. Minimum Moves to Clean the Classroom
• 3575. Maximum Good Subtree Score
• 3585. Find Weighted Median Node in Tree
• 3594. Minimum Time to Transport All Individuals
• 3595. Once Twice 🔒
• 3599. Partition Array to Minimize XOR
• 3615. Longest Palindromic Path in Graph
• 3621. Number of Integers With Popcount-Depth Equal to K I
• 3630. Partition Array for Maximum XOR and AND
• 3632. Subarrays with XOR at Least K 🔒
• 3644. Maximum K to Sort a Permutation
• 3646. Next Special Palindrome Number
• 3670. Maximum Product of Two Integers With No Common Bits
• 3674. Minimum Operations to Equalize Array
• 3677. Count Binary Palindromic Numbers
• 3681. Maximum XOR of Subsequences
• 3688. Bitwise OR of Even Numbers in an Array
• 3702. Longest Subsequence With Non-Zero Bitwise XOR
• 3750. Minimum Number of Flips to Reverse Binary String
• 3755. Find Maximum Balanced XOR Subarray Length
• 3757. Number of Effective Subsequences
• 3766. Minimum Operations to Make Binary Palindrome
• 3801. Minimum Cost to Merge Sorted Lists
• 3806. Maximum Bitwise AND After Increment Operations
• 3811. Number of Alternating XOR Partitions
• 3821. Find Nth Smallest Integer With K One Bits
• 3827. Count Monobit Integers
• 3841. Palindromic Path Queries in a Tree
• 3845. Maximum Subarray XOR with Bounded Range
• 3849. Maximum Bitwise XOR After Rearrangement
• 3877. Minimum Removals to Achieve Target XOR
• 3878. Count Good Subarrays
• 3882. Minimum XOR Path in a Grid
• 3910. Count Connected Subgraphs with Even Node Sum
• 3950. Exactly One Consecutive Set Bits Pair
• 3954. Sum of Compatible Numbers in Range I
• 3955. Valid Binary Strings With Cost Limit
• 3973. Distinct Gate Paths to LCA 🔒
• 3990. Create Grid With Exactly K Paths II 🔒
• 4027. Elevator Requests III

Bitmask

• 351. Android Unlock Patterns 🔒
• 464. Can I Win
• 465. Optimal Account Balancing 🔒
• 473. Matchsticks to Square
• 526. Beautiful Arrangement
• 638. Shopping Offers
• 691. Stickers to Spell Word
• 698. Partition to K Equal Sum Subsets
• 805. Split Array With Same Average
• 847. Shortest Path Visiting All Nodes
• 943. Find the Shortest Superstring
• 996. Number of Squareful Arrays
• 1066. Campus Bikes II 🔒
• 1125. Smallest Sufficient Team
• 1255. Maximum Score Words Formed by Letters
• 1349. Maximum Students Taking Exam
• 1434. Number of Ways to Wear Different Hats to Each Other
• 1494. Parallel Courses II
• 1595. Minimum Cost to Connect Two Groups of Points
• 1617. Count Subtrees With Max Distance Between Cities
• 1655. Distribute Repeating Integers
• 1659. Maximize Grid Happiness
• 1681. Minimum Incompatibility
• 1723. Find Minimum Time to Finish All Jobs
• 1755. Closest Subsequence Sum
• 1799. Maximize Score After N Operations
• 1815. Maximum Number of Groups Getting Fresh Donuts
• 1879. Minimum XOR Sum of Two Arrays
• 1947. Maximum Compatibility Score Sum
• 1986. Minimum Number of Work Sessions to Finish the Tasks
• 1994. The Number of Good Subsets
• 2002. Maximum Product of the Length of Two Palindromic Subsequences
• 2035. Partition Array Into Two Arrays to Minimize Sum Difference
• 2152. Minimum Number of Lines to Cover Points 🔒
• 2172. Maximum AND Sum of Array
• 2184. Number of Ways to Build Sturdy Brick Wall 🔒
• 2247. Maximum Cost of Trip With K Highways 🔒
• 2305. Fair Distribution of Cookies
• 2403. Minimum Time to Kill All Monsters 🔒
• 2572. Count the Number of Square-Free Subsets
• 2741. Special Permutations
• 2850. Minimum Moves to Spread Stones Over Grid
• 2992. Number of Self-Divisible Permutations 🔒
• 3003. Maximize the Number of Partitions After Operations
• 3149. Find the Minimum Cost Array Permutation
• 3276. Select Cells in Grid With Maximum Score
• 3283. Maximum Number of Moves to Kill All Pawns
• 3376. Minimum Time to Break Locks I
• 3444. Minimum Increments for Target Multiples in an Array
• 3530. Maximum Profit from Valid Topological Order in DAG
• 3533. Concatenated Divisibility
• 3539. Find Sum of Array Product of Magical Sequences
• 3575. Maximum Good Subtree Score
• 3594. Minimum Time to Transport All Individuals
• 3615. Longest Palindromic Path in Graph
• 4027. Elevator Requests III

Borůvka

• 1168. Optimize Water Distribution in a Village 🔒
• 1489. Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree
• 1584. Min Cost to Connect All Points

Bounded Knapsack

• 2585. Number of Ways to Earn Points
• 2902. Count of Sub-Multisets With Bounded Sum

Boyer-Moore Voting

• 169. Majority Element
• 229. Majority Element II
• 1157. Online Majority Element In Subarray
• 1538. Guess the Majority in a Hidden Array 🔒

Boyer–Moore

• 28. Find the Index of the First Occurrence in a String
• 187. Repeated DNA Sequences
• 686. Repeated String Match
• 1044. Longest Duplicate Substring
• 3006. Find Beautiful Indices in the Given Array I
• 3008. Find Beautiful Indices in the Given Array II

Brainteaser

• 292. Nim Game
• 319. Bulb Switcher
• 810. Chalkboard XOR Game
• 1025. Divisor Game
• 1033. Moving Stones Until Consecutive
• 1227. Airplane Seat Assignment Probability
• 1503. Last Moment Before All Ants Fall Out of a Plank
• 1908. Game of Nim 🔒
• 2396. Strictly Palindromic Number
• 2419. Longest Subarray With Maximum Bitwise AND
• 2425. Bitwise XOR of All Pairings
• 2505. Bitwise OR of All Subsequence Sums 🔒
• 2568. Minimum Impossible OR
• 2731. Movement of Robots
• 2745. Construct the Longest New String
• 2749. Minimum Operations to Make the Integer Zero
• 3227. Vowels Game in a String
• 3577. Count the Number of Computer Unlocking Permutations
• 3596. Minimum Cost Path with Alternating Directions I 🔒
• 3674. Minimum Operations to Equalize Array
• 3828. Final Element After Subarray Deletions

Breadth-First Search

• 100. Same Tree
• 101. Symmetric Tree
• 102. Binary Tree Level Order Traversal
• 103. Binary Tree Zigzag Level Order Traversal
• 104. Maximum Depth of Binary Tree
• 107. Binary Tree Level Order Traversal II
• 111. Minimum Depth of Binary Tree
• 112. Path Sum
• 116. Populating Next Right Pointers in Each Node
• 117. Populating Next Right Pointers in Each Node II
• 126. Word Ladder II
• 127. Word Ladder
• 130. Surrounded Regions
• 133. Clone Graph
• 199. Binary Tree Right Side View
• 200. Number of Islands
• 207. Course Schedule
• 210. Course Schedule II
• 226. Invert Binary Tree
• 261. Graph Valid Tree 🔒
• 269. Alien Dictionary 🔒
• 279. Perfect Squares
• 286. Walls and Gates 🔒
• 297. Serialize and Deserialize Binary Tree
• 301. Remove Invalid Parentheses
• 302. Smallest Rectangle Enclosing Black Pixels 🔒
• 310. Minimum Height Trees
• 314. Binary Tree Vertical Order Traversal 🔒
• 317. Shortest Distance from All Buildings 🔒
• 322. Coin Change
• 323. Number of Connected Components in an Undirected Graph 🔒
• 329. Longest Increasing Path in a Matrix
• 339. Nested List Weight Sum 🔒
• 364. Nested List Weight Sum II 🔒
• 365. Water and Jug Problem
• 399. Evaluate Division
• 404. Sum of Left Leaves
• 407. Trapping Rain Water II
• 417. Pacific Atlantic Water Flow
• 428. Serialize and Deserialize N-ary Tree 🔒
• 429. N-ary Tree Level Order Traversal
• 431. Encode N-ary Tree to Binary Tree 🔒
• 433. Minimum Genetic Mutation
• 449. Serialize and Deserialize BST
• 463. Island Perimeter
• 488. Zuma Game
• 490. The Maze 🔒
• 499. The Maze III 🔒
• 505. The Maze II 🔒
• 513. Find Bottom Left Tree Value
• 514. Freedom Trail
• 515. Find Largest Value in Each Tree Row
• 529. Minesweeper
• 530. Minimum Absolute Difference in BST
• 542. 1 Matrix
• 547. Number of Provinces
• 559. Maximum Depth of N-ary Tree
• 582. Kill Process 🔒
• 617. Merge Two Binary Trees
• 623. Add One Row to Tree
• 637. Average of Levels in Binary Tree
• 653. Two Sum IV - Input is a BST
• 655. Print Binary Tree
• 662. Maximum Width of Binary Tree
• 672. Bulb Switcher II
• 675. Cut Off Trees for Golf Event
• 684. Redundant Connection
• 685. Redundant Connection II
• 690. Employee Importance
• 694. Number of Distinct Islands 🔒
• 695. Max Area of Island
• 711. Number of Distinct Islands II 🔒
• 721. Accounts Merge
• 733. Flood Fill
• 737. Sentence Similarity II 🔒
• 742. Closest Leaf in a Binary Tree 🔒
• 743. Network Delay Time
• 749. Contain Virus
• 752. Open the Lock
• 765. Couples Holding Hands
• 773. Sliding Puzzle
• 778. Swim in Rising Water
• 783. Minimum Distance Between BST Nodes
• 785. Is Graph Bipartite
• 787. Cheapest Flights Within K Stops
• 797. All Paths From Source to Target
• 802. Find Eventual Safe States
• 815. Bus Routes
• 827. Making A Large Island
• 839. Similar String Groups
• 841. Keys and Rooms
• 847. Shortest Path Visiting All Nodes
• 854. K-Similar Strings
• 863. All Nodes Distance K in Binary Tree
• 864. Shortest Path to Get All Keys
• 865. Smallest Subtree with all the Deepest Nodes
• 886. Possible Bipartition
• 909. Snakes and Ladders
• 919. Complete Binary Tree Inserter
• 924. Minimize Malware Spread
• 928. Minimize Malware Spread II
• 934. Shortest Bridge
• 958. Check Completeness of a Binary Tree
• 959. Regions Cut By Slashes
• 965. Univalued Binary Tree
• 967. Numbers With Same Consecutive Differences
• 987. Vertical Order Traversal of a Binary Tree
• 993. Cousins in Binary Tree
• 994. Rotting Oranges
• 1020. Number of Enclaves
• 1034. Coloring A Border
• 1036. Escape a Large Maze
• 1042. Flower Planting With No Adjacent
• 1087. Brace Expansion 🔒
• 1091. Shortest Path in Binary Matrix
• 1096. Brace Expansion II
• 1102. Path With Maximum Minimum Value 🔒
• 1123. Lowest Common Ancestor of Deepest Leaves
• 1129. Shortest Path with Alternating Colors
• 1161. Maximum Level Sum of a Binary Tree
• 1162. As Far from Land as Possible
• 1197. Minimum Knight Moves 🔒
• 1202. Smallest String With Swaps
• 1203. Sort Items by Groups Respecting Dependencies
• 1210. Minimum Moves to Reach Target with Rotations
• 1215. Stepping Numbers 🔒
• 1236. Web Crawler 🔒
• 1242. Web Crawler Multithreaded 🔒
• 1245. Tree Diameter 🔒
• 1254. Number of Closed Islands
• 1257. Smallest Common Region 🔒
• 1261. Find Elements in a Contaminated Binary Tree
• 1263. Minimum Moves to Move a Box to Their Target Location
• 1267. Count Servers that Communicate
• 1273. Delete Tree Nodes 🔒
• 1284. Minimum Number of Flips to Convert Binary Matrix to Zero Matrix
• 1293. Shortest Path in a Grid with Obstacles Elimination
• 1298. Maximum Candies You Can Get from Boxes
• 1302. Deepest Leaves Sum
• 1306. Jump Game III
• 1311. Get Watched Videos by Your Friends
• 1315. Sum of Nodes with Even-Valued Grandparent
• 1319. Number of Operations to Make Network Connected
• 1345. Jump Game IV
• 1361. Validate Binary Tree Nodes
• 1368. Minimum Cost to Make at Least One Valid Path in a Grid
• 1376. Time Needed to Inform All Employees
• 1377. Frog Position After T Seconds
• 1379. Find a Corresponding Node of a Binary Tree in a Clone of That Tree
• 1391. Check if There is a Valid Path in a Grid
• 1430. Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree 🔒
• 1443. Minimum Time to Collect All Apples in a Tree
• 1448. Count Good Nodes in Binary Tree
• 1457. Pseudo-Palindromic Paths in a Binary Tree
• 1462. Course Schedule IV
• 1466. Reorder Routes to Make All Paths Lead to the City Zero
• 1469. Find All The Lonely Nodes 🔒
• 1483. Kth Ancestor of a Tree Node
• 1485. Clone Binary Tree With Random Pointer 🔒
• 1490. Clone N-ary Tree 🔒
• 1519. Number of Nodes in the Sub-Tree With the Same Label
• 1559. Detect Cycles in 2D Grid
• 1568. Minimum Number of Days to Disconnect Island
• 1602. Find Nearest Right Node in Binary Tree 🔒
• 1609. Even Odd Tree
• 1625. Lexicographically Smallest String After Applying Operations
• 1631. Path With Minimum Effort
• 1654. Minimum Jumps to Reach Home
• 1660. Correct a Binary Tree 🔒
• 1730. Shortest Path to Get Food 🔒
• 1740. Find Distance in a Binary Tree 🔒
• 1765. Map of Highest Peak
• 1778. Shortest Path in a Hidden Grid 🔒
• 1810. Minimum Path Cost in a Hidden Grid 🔒
• 1905. Count Sub Islands
• 1926. Nearest Exit from Entrance in Maze
• 1970. Last Day Where You Can Still Cross
• 1971. Find if Path Exists in Graph
• 1992. Find All Groups of Farmland
• 1993. Operations on Tree
• 2039. The Time When the Network Becomes Idle
• 2045. Second Minimum Time to Reach Destination
• 2059. Minimum Operations to Convert Number
• 2092. Find All People With Secret
• 2101. Detonate the Maximum Bombs
• 2146. K Highest Ranked Items Within a Price Range
• 2174. Remove All Ones With Row and Column Flips II 🔒
• 2192. All Ancestors of a Node in a Directed Acyclic Graph
• 2204. Distance to a Cycle in Undirected Graph 🔒
• 2258. Escape the Spreading Fire
• 2277. Closest Node to Path in Tree 🔒
• 2290. Minimum Obstacle Removal to Reach Corner
• 2316. Count Unreachable Pairs of Nodes in an Undirected Graph
• 2328. Number of Increasing Paths in a Grid
• 2360. Longest Cycle in a Graph
• 2368. Reachable Nodes With Restrictions
• 2385. Amount of Time for Binary Tree to Be Infected
• 2415. Reverse Odd Levels of Binary Tree
• 2445. Number of Nodes With Value One 🔒
• 2458. Height of Binary Tree After Subtree Removal Queries
• 2467. Most Profitable Path in a Tree
• 2471. Minimum Number of Operations to Sort a Binary Tree by Level
• 2477. Minimum Fuel Cost to Report to the Capital
• 2492. Minimum Score of a Path Between Two Cities
• 2493. Divide Nodes Into the Maximum Number of Groups
• 2503. Maximum Number of Points From Grid Queries
• 2556. Disconnect Path in a Binary Matrix by at Most One Flip
• 2577. Minimum Time to Visit a Cell In a Grid
• 2583. Kth Largest Sum in a Binary Tree
• 2596. Check Knight Tour Configuration
• 2608. Shortest Cycle in a Graph
• 2612. Minimum Reverse Operations
• 2617. Minimum Number of Visited Cells in a Grid
• 2641. Cousins in Binary Tree II
• 2658. Maximum Number of Fish in a Grid
• 2685. Count the Number of Complete Components
• 2773. Height of Special Binary Tree 🔒
• 2812. Find the Safest Path in a Grid
• 2814. Minimum Time Takes to Reach Destination Without Drowning 🔒
• 2852. Sum of Remoteness of All Cells 🔒
• 2858. Minimum Edge Reversals So Every Node Is Reachable
• 2998. Minimum Number of Operations to Make X and Y Equal
• 3015. Count the Number of Houses at a Certain Distance I
• 3123. Find Edges in Shortest Paths
• 3141. Maximum Hamming Distances 🔒
• 3157. Find the Level of Tree with Minimum Sum 🔒
• 3203. Find Minimum Diameter After Merging Two Trees
• 3235. Check if the Rectangle Corner Is Reachable
• 3243. Shortest Distance After Road Addition Queries I
• 3283. Maximum Number of Moves to Kill All Pawns
• 3286. Find a Safe Walk Through a Grid
• 3310. Remove Methods From Project
• 3372. Maximize the Number of Target Nodes After Connecting Trees I
• 3373. Maximize the Number of Target Nodes After Connecting Trees II
• 3376. Minimum Time to Break Locks I
• 3383. Minimum Runes to Add to Cast Spell 🔒
• 3385. Minimum Time to Break Locks II 🔒
• 3387. Maximize Amount After Two Days of Conversions
• 3419. Minimize the Maximum Edge Weight of Graph
• 3481. Apply Substitutions 🔒
• 3493. Properties Graph
• 3528. Unit Conversion I
• 3535. Unit Conversion II 🔒
• 3552. Grid Teleportation Traversal
• 3568. Minimum Moves to Clean the Classroom
• 3607. Power Grid Maintenance
• 3619. Count Islands With Total Value Divisible by K
• 3629. Minimum Jumps to Reach End via Prime Teleportation
• 3666. Minimum Operations to Equalize Binary String
• 3710. Maximum Partition Factor
• 3787. Find Diameter Endpoints of a Tree 🔒
• 3807. Minimum Cost to Repair Edges to Traverse a Graph 🔒
• 3820. Pythagorean Distance Nodes in a Tree
• 3831. Median of a Binary Search Tree Level 🔒
• 3902. Zigzag Level Sum of Binary Tree 🔒
• 3905. Multi Source Flood Fill
• 3910. Count Connected Subgraphs with Even Node Sum
• 3991. Sort Array Using Prefix Reversals 🔒

Bridge

• 1192. Critical Connections in a Network

Brute-Force Search

• 139. Word Break
• 995. Minimum Number of K Consecutive Bit Flips

Bubble Sort

• 75. Sort Colors
• 1051. Height Checker
• 1122. Relative Sort Array
• 1859. Sorting the Sentence

Bucket Sort

• 164. Maximum Gap
• 220. Contains Duplicate III
• 347. Top K Frequent Elements
• 451. Sort Characters By Frequency
• 692. Top K Frequent Words
• 912. Sort an Array

Bézout's Identity

• 365. Water and Jug Problem
• 1250. Check If It Is a Good Array

Cartesian Tree

• 654. Maximum Binary Tree
• 1130. Minimum Cost Tree From Leaf Values
• 1793. Maximum Score of a Good Subarray
• 1856. Maximum Subarray Min-Product
• 1950. Maximum of Minimum Values in All Subarrays 🔒

Closest Pair of Points

• 612. Shortest Distance in a Plane 🔒
• 613. Shortest Distance in a Line 🔒

Combinatorics

• 62. Unique Paths
• 458. Poor Pigs
• 634. Find the Derangement of An Array 🔒
• 920. Number of Music Playlists
• 1201. Ugly Number III
• 1359. Count All Valid Pickup and Delivery Options
• 1467. Probability of a Two Boxes Having The Same Number of Distinct Balls
• 1569. Number of Ways to Reorder Array to Get Same BST
• 1621. Number of Sets of K Non-Overlapping Line Segments
• 1641. Count Sorted Vowel Strings
• 1643. Kth Smallest Instructions
• 1735. Count Ways to Make Array With Product
• 1830. Minimum Number of Operations to Make String Sorted
• 1863. Sum of All Subset XOR Totals
• 1866. Number of Ways to Rearrange Sticks With K Sticks Visible
• 1916. Count Ways to Build Rooms in an Ant Colony
• 2063. Vowels of All Substrings
• 2221. Find Triangular Sum of an Array
• 2338. Count the Number of Ideal Arrays
• 2400. Number of Ways to Reach a Position After Exactly k Steps
• 2514. Count Anagrams
• 2539. Count the Number of Good Subsequences 🔒
• 2597. The Number of Beautiful Subsets
• 2638. Count the Number of K-Free Subsets 🔒
• 2842. Count K-Subsequences of a String With Maximum Beauty
• 2912. Number of Ways to Reach Destination in the Grid 🔒
• 2927. Distribute Candies Among Children III 🔒
• 2928. Distribute Candies Among Children I
• 2929. Distribute Candies Among Children II
• 2930. Number of Strings Which Can Be Rearranged to Contain Substring
• 2954. Count the Number of Infection Sequences
• 2963. Count the Number of Good Partitions
• 3116. Kth Smallest Amount With Single Denomination Combination
• 3128. Right Triangles
• 3154. Find Number of Ways to Reach the K-th Stair
• 3179. Find the N-th Value After K Seconds
• 3247. Number of Subsequences with Odd Sum 🔒
• 3250. Find the Count of Monotonic Pairs I
• 3251. Find the Count of Monotonic Pairs II
• 3272. Find the Count of Good Integers
• 3312. Sorted GCD Pair Queries
• 3317. Find the Number of Possible Ways for an Event
• 3343. Count Number of Balanced Permutations
• 3352. Count K-Reducible Numbers Less Than N
• 3395. Subsequences with a Unique Middle Mode I
• 3405. Count the Number of Arrays with K Matching Adjacent Elements
• 3416. Subsequences with a Unique Middle Mode II 🔒
• 3426. Manhattan Distances of All Arrangements of Pieces
• 3428. Maximum and Minimum Sums of at Most Size K Subsequences
• 3461. Check If Digits Are Equal in String After Operations I
• 3463. Check If Digits Are Equal in String After Operations II
• 3470. Permutations IV
• 3518. Smallest Palindromic Rearrangement II
• 3539. Find Sum of Array Product of Magical Sequences
• 3577. Count the Number of Computer Unlocking Permutations
• 3621. Number of Integers With Popcount-Depth Equal to K I
• 3725. Count Ways to Choose Coprime Integers from Rows
• 3757. Number of Effective Subsequences
• 3821. Find Nth Smallest Integer With K One Bits
• 3855. Sum of K-Digit Numbers in a Range
• 3881. Direction Assignments with Exactly K Visible People
• 3953. Maximum Score with Co-Prime Element
• 3988. Create Grid With Exactly K Paths I
• 3990. Create Grid With Exactly K Paths II 🔒
• 4002. Count Valid Sequences

Concurrency

• 1114. Print in Order
• 1115. Print FooBar Alternately
• 1116. Print Zero Even Odd
• 1117. Building H2O
• 1188. Design Bounded Blocking Queue 🔒
• 1195. Fizz Buzz Multithreaded
• 1226. The Dining Philosophers
• 1242. Web Crawler Multithreaded 🔒
• 1279. Traffic Light Controlled Intersection 🔒

Convex Hull

• 587. Erect the Fence

Counting

• 169. Majority Element
• 229. Majority Element II
• 299. Bulls and Cows
• 347. Top K Frequent Elements
• 358. Rearrange String k Distance Apart 🔒
• 383. Ransom Note
• 387. First Unique Character in a String
• 451. Sort Characters By Frequency
• 594. Longest Harmonious Subsequence
• 621. Task Scheduler
• 692. Top K Frequent Words
• 767. Reorganize String
• 811. Subdomain Visit Count
• 819. Most Common Word
• 869. Reordered Power of 2
• 884. Uncommon Words from Two Sentences
• 900. RLE Iterator
• 914. X of a Kind in a Deck of Cards
• 923. 3Sum With Multiplicity
• 945. Minimum Increment to Make Array Unique
• 992. Subarrays with K Different Integers
• 1010. Pairs of Songs With Total Durations Divisible by 60
• 1054. Distant Barcodes
• 1079. Letter Tile Possibilities
• 1090. Largest Values From Labels
• 1121. Divide Array Into Increasing Sequences 🔒
• 1128. Number of Equivalent Domino Pairs
• 1160. Find Words That Can Be Formed by Characters
• 1189. Maximum Number of Balloons
• 1198. Find Smallest Common Element in All Rows 🔒
• 1213. Intersection of Three Sorted Arrays 🔒
• 1221. Split a String in Balanced Strings
• 1255. Maximum Score Words Formed by Letters
• 1267. Count Servers that Communicate
• 1347. Minimum Number of Steps to Make Two Strings Anagram
• 1356. Sort Integers by The Number of 1 Bits
• 1366. Rank Teams by Votes
• 1370. Increasing Decreasing String
• 1394. Find Lucky Integer in an Array
• 1399. Count Largest Group
• 1400. Construct K Palindrome Strings
• 1419. Minimum Number of Frogs Croaking
• 1481. Least Number of Unique Integers after K Removals
• 1497. Check If Array Pairs Are Divisible by k
• 1512. Number of Good Pairs
• 1519. Number of Nodes in the Sub-Tree With the Same Label
• 1603. Design Parking System
• 1612. Check If Two Expression Trees are Equivalent 🔒
• 1655. Distribute Repeating Integers
• 1657. Determine if Two Strings Are Close
• 1684. Count the Number of Consistent Strings
• 1704. Determine if String Halves Are Alike
• 1726. Tuple with Same Product
• 1737. Change Minimum Characters to Satisfy One of Three Conditions
• 1742. Maximum Number of Balls in a Box
• 1748. Sum of Unique Elements
• 1775. Equal Sum Arrays With Minimum Number of Operations
• 1781. Sum of Beauty of All Substrings
• 1782. Count Pairs Of Nodes
• 1787. Make the XOR of All Segments Equal to Zero
• 1790. Check if One String Swap Can Make Strings Equal
• 1814. Count Nice Pairs in an Array
• 1819. Number of Different Subsequences GCDs
• 1830. Minimum Number of Operations to Make String Sorted
• 1854. Maximum Population Year
• 1857. Largest Color Value in a Directed Graph
• 1862. Sum of Floored Pairs
• 1876. Substrings of Size Three with Distinct Characters
• 1897. Redistribute Characters to Make All Strings Equal
• 1940. Longest Common Subsequence Between Sorted Arrays 🔒
• 1941. Check if All Characters Have Equal Number of Occurrences
• 1982. Find Array Given Subset Sums
• 1994. The Number of Good Subsets
• 2001. Number of Pairs of Interchangeable Rectangles
• 2006. Count Number of Pairs With Absolute Difference K
• 2013. Detect Squares
• 2014. Longest Subsequence Repeated k Times
• 2023. Number of Pairs of Strings With Concatenation Equal to Target
• 2025. Maximum Number of Ways to Partition an Array
• 2029. Stone Game IX
• 2048. Next Greater Numerically Balanced Number
• 2053. Kth Distinct String in an Array
• 2067. Number of Equal Count Substrings 🔒
• 2068. Check Whether Two Strings are Almost Equivalent
• 2083. Substrings That Begin and End With the Same Letter 🔒
• 2085. Count Common Words With One Occurrence
• 2131. Longest Palindrome by Concatenating Two Letter Words
• 2148. Count Elements With Strictly Smaller and Greater Elements
• 2150. Find All Lonely Numbers in the Array
• 2168. Unique Substrings With Equal Digit Frequency 🔒
• 2170. Minimum Operations to Make the Array Alternating
• 2182. Construct String With Repeat Limit
• 2183. Count Array Pairs Divisible by K
• 2186. Minimum Number of Steps to Make Two Strings Anagram II
• 2190. Most Frequent Number Following Key In an Array
• 2198. Number of Single Divisor Triplets 🔒
• 2206. Divide Array Into Equal Pairs
• 2225. Find Players With Zero or One Losses
• 2244. Minimum Rounds to Complete All Tasks
• 2248. Intersection of Multiple Arrays
• 2268. Minimum Number of Keypresses 🔒
• 2275. Largest Combination With Bitwise AND Greater Than Zero
• 2283. Check if Number Has Equal Digit Count and Digit Value
• 2284. Sender With Largest Word Count
• 2287. Rearrange Characters to Make Target String
• 2341. Maximum Number of Pairs in Array
• 2347. Best Poker Hand
• 2351. First Letter to Appear Twice
• 2364. Count Number of Bad Pairs
• 2384. Largest Palindromic Number
• 2404. Most Frequent Even Element
• 2416. Sum of Prefix Scores of Strings
• 2423. Remove Letter To Equalize Frequency
• 2442. Count Number of Distinct Integers After Reverse Operations
• 2453. Destroy Sequential Targets
• 2499. Minimum Total Cost to Make Arrays Unequal
• 2506. Count Pairs Of Similar Strings
• 2514. Count Anagrams
• 2526. Find Consecutive Integers from a Data Stream
• 2529. Maximum Count of Positive Integer and Negative Integer
• 2531. Make Number of Distinct Characters Equal
• 2539. Count the Number of Good Subsequences 🔒
• 2547. Minimum Cost to Split an Array
• 2586. Count the Number of Vowel Strings in Range
• 2748. Number of Beautiful Pairs
• 2782. Number of Unique Categories 🔒
• 2833. Furthest Point From Origin
• 2856. Minimum Array Length After Pair Removals
• 2870. Minimum Number of Operations to Make Array Empty
• 2950. Number of Divisible Substrings 🔒
• 2955. Number of Same-End Substrings 🔒
• 2960. Count Tested Devices After Test Operations
• 2981. Find Longest Special Substring That Occurs Thrice I
• 2982. Find Longest Special Substring That Occurs Thrice II
• 3005. Count Elements With Maximum Frequency
• 3016. Minimum Number of Pushes to Type Word II
• 3035. Maximum Palindromes After Operations
• 3039. Apply Operations to Make String Empty
• 3044. Most Frequent Prime
• 3046. Split the Array
• 3063. Linked List Frequency 🔒
• 3071. Minimum Operations to Write the Letter Y on a Grid
• 3081. Replace Question Marks in String to Minimize Its Value
• 3084. Count Substrings Starting and Ending with Given Character
• 3085. Minimum Deletions to Make String K-Special
• 3128. Right Triangles
• 3137. Minimum Number of Operations to Make Word K-Periodic
• 3138. Minimum Length of Anagram Concatenation
• 3144. Minimum Substring Partition of Equal Character Frequency
• 3153. Sum of Digit Differences of All Pairs
• 3167. Better Compression of String 🔒
• 3184. Count Pairs That Form a Complete Day I
• 3185. Count Pairs That Form a Complete Day II
• 3186. Maximum Total Damage With Spell Casting
• 3223. Minimum Length of String After Operations
• 3228. Maximum Number of Operations to Move Ones to the End
• 3238. Find the Number of Winning Players
• 3265. Count Almost Equal Pairs I
• 3267. Count Almost Equal Pairs II
• 3279. Maximum Total Area Occupied by Pistons 🔒
• 3312. Sorted GCD Pair Queries
• 3335. Total Characters in String After Transformations I
• 3337. Total Characters in String After Transformations II
• 3371. Identify the Largest Outlier in an Array
• 3389. Minimum Operations to Make Character Frequencies Equal
• 3438. Find Valid Pair of Adjacent Digits in String
• 3442. Maximum Difference Between Even and Odd Frequency I
• 3443. Maximum Manhattan Distance After K Changes
• 3467. Transform Array by Parity
• 3518. Smallest Palindromic Rearrangement II
• 3527. Find the Most Common Response
• 3541. Find Most Frequent Vowel and Consonant
• 3545. Minimum Deletions for At Most K Distinct Characters
• 3581. Count Odd Letters from Number 🔒
• 3583. Count Special Triplets
• 3591. Check if Any Element Has Prime Frequency
• 3636. Threshold Majority Queries
• 3659. Partition Array Into K-Distinct Groups
• 3662. Filter Characters by Frequency 🔒
• 3663. Find The Least Frequent Digit
• 3664. Two-Letter Card Game
• 3672. Sum of Weighted Modes in Subarrays 🔒
• 3679. Minimum Discards to Balance Inventory
• 3712. Sum of Elements With Frequency Divisible by K
• 3713. Longest Balanced Substring I
• 3715. Sum of Perfect Square Ancestors
• 3720. Lexicographically Smallest Permutation Greater Than Target
• 3737. Count Subarrays With Majority Element I
• 3746. Minimum String Length After Balanced Removals
• 3773. Maximum Number of Equal Length Runs 🔒
• 3785. Minimum Swaps to Avoid Forbidden Values
• 3805. Count Caesar Cipher Pairs
• 3837. Delayed Count of Equal Elements 🔒
• 3839. Number of Prefix Connected Groups
• 3843. First Element with Unique Frequency
• 3848. Check Digitorial Permutation
• 3852. Smallest Pair With Different Frequencies
• 3859. Count Subarrays With K Distinct Integers
• 3866. First Unique Even Element
• 3868. Minimum Cost to Equalize Arrays Using Swaps
• 3889. Mirror Frequency Distance
• 3890. Integers With Multiple Sum of Two Cubes
• 3943. Number of Pairs After Increment
• 3960. Frequency Balance Subarray
• 3968. Maximum Manhattan Distance After All Moves
• 3978. Unique Middle Element
• 4005. Minimum Operations to Make Array Equal III 🔒
• 4006. Count Valid Prefixes
• 4007. Widest Possible Fence