0400–0499

Problems in this range: 100

• 400. Nth Digit
• 401. Binary Watch
• 402. Remove K Digits
• 403. Frog Jump
• 404. Sum of Left Leaves
• 405. Convert a Number to Hexadecimal
• 406. Queue Reconstruction by Height
• 407. Trapping Rain Water II
• 408. Valid Word Abbreviation 🔒
• 409. Longest Palindrome
• 410. Split Array Largest Sum
• 411. Minimum Unique Word Abbreviation 🔒
• 412. Fizz Buzz
• 413. Arithmetic Slices
• 414. Third Maximum Number
• 415. Add Strings
• 416. Partition Equal Subset Sum
• 417. Pacific Atlantic Water Flow
• 418. Sentence Screen Fitting 🔒
• 419. Battleships in a Board
• 420. Strong Password Checker
• 421. Maximum XOR of Two Numbers in an Array
• 422. Valid Word Square 🔒
• 423. Reconstruct Original Digits from English
• 424. Longest Repeating Character Replacement
• 425. Word Squares 🔒
• 426. Convert Binary Search Tree to Sorted Doubly Linked List 🔒
• 427. Construct Quad Tree
• 428. Serialize and Deserialize N-ary Tree 🔒
• 429. N-ary Tree Level Order Traversal
• 430. Flatten a Multilevel Doubly Linked List
• 431. Encode N-ary Tree to Binary Tree 🔒
• 432. All O`one Data Structure
• 433. Minimum Genetic Mutation
• 434. Number of Segments in a String
• 435. Non-overlapping Intervals
• 436. Find Right Interval
• 437. Path Sum III
• 438. Find All Anagrams in a String
• 439. Ternary Expression Parser 🔒
• 440. K-th Smallest in Lexicographical Order
• 441. Arranging Coins
• 442. Find All Duplicates in an Array
• 443. String Compression
• 444. Sequence Reconstruction 🔒
• 445. Add Two Numbers II
• 446. Arithmetic Slices II - Subsequence
• 447. Number of Boomerangs
• 448. Find All Numbers Disappeared in an Array
• 449. Serialize and Deserialize BST
• 450. Delete Node in a BST
• 451. Sort Characters By Frequency
• 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
• 458. Poor Pigs
• 459. Repeated Substring Pattern
• 460. LFU Cache
• 461. Hamming Distance
• 462. Minimum Moves to Equal Array Elements II
• 463. Island Perimeter
• 464. Can I Win
• 465. Optimal Account Balancing 🔒
• 466. Count The Repetitions
• 467. Unique Substrings in Wraparound String
• 468. Validate IP Address
• 469. Convex Polygon 🔒
• 470. Implement Rand10() Using Rand7()
• 471. Encode String with Shortest Length 🔒
• 472. Concatenated Words
• 473. Matchsticks to Square
• 474. Ones and Zeroes
• 475. Heaters
• 476. Number Complement
• 477. Total Hamming Distance
• 478. Generate Random Point in a Circle
• 479. Largest Palindrome Product
• 480. Sliding Window Median
• 481. Magical String
• 482. License Key Formatting
• 483. Smallest Good Base
• 484. Find Permutation 🔒
• 485. Max Consecutive Ones
• 486. Predict the Winner
• 487. Max Consecutive Ones II 🔒
• 488. Zuma Game
• 489. Robot Room Cleaner 🔒
• 490. The Maze 🔒
• 491. Non-decreasing Subsequences
• 492. Construct the Rectangle
• 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 🔒