0500–0599

Problems in this range: 100

• 500. Keyboard Row
• 501. Find Mode in Binary Search Tree
• 502. IPO
• 503. Next Greater Element II
• 504. Base 7
• 505. The Maze II 🔒
• 506. Relative Ranks
• 507. Perfect Number
• 508. Most Frequent Subtree Sum
• 509. Fibonacci Number
• 510. Inorder Successor in BST II 🔒
• 511. Game Play Analysis I
• 512. Game Play Analysis II 🔒
• 513. Find Bottom Left Tree Value
• 514. Freedom Trail
• 515. Find Largest Value in Each Tree Row
• 516. Longest Palindromic Subsequence
• 517. Super Washing Machines
• 518. Coin Change II
• 519. Random Flip Matrix
• 520. Detect Capital
• 521. Longest Uncommon Subsequence I
• 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
• 530. Minimum Absolute Difference in BST
• 531. Lonely Pixel I 🔒
• 532. K-diff Pairs in an Array
• 533. Lonely Pixel II 🔒
• 534. Game Play Analysis III 🔒
• 535. Encode and Decode TinyURL
• 536. Construct Binary Tree from String 🔒
• 537. Complex Number Multiplication
• 538. Convert BST to Greater Tree
• 539. Minimum Time Difference
• 540. Single Element in a Sorted Array
• 541. Reverse String II
• 542. 1 Matrix
• 543. Diameter of Binary Tree
• 544. Output Contest Matches 🔒
• 545. Boundary of Binary Tree 🔒
• 546. Remove Boxes
• 547. Number of Provinces
• 548. Split Array with Equal Sum 🔒
• 549. Binary Tree Longest Consecutive Sequence II 🔒
• 550. Game Play Analysis IV
• 551. Student Attendance Record I
• 552. Student Attendance Record II
• 553. Optimal Division
• 554. Brick Wall
• 555. Split Concatenated Strings 🔒
• 556. Next Greater Element III
• 557. Reverse Words in a String III
• 558. Logical OR of Two Binary Grids Represented as Quad-Trees
• 559. Maximum Depth of N-ary Tree
• 560. Subarray Sum Equals K
• 561. Array Partition
• 562. Longest Line of Consecutive One in Matrix 🔒
• 563. Binary Tree Tilt
• 564. Find the Closest Palindrome
• 565. Array Nesting
• 566. Reshape the Matrix
• 567. Permutation in String
• 568. Maximum Vacation Days 🔒
• 569. Median Employee Salary 🔒
• 570. Managers with at Least 5 Direct Reports
• 571. Find Median Given Frequency of Numbers 🔒
• 572. Subtree of Another Tree
• 573. Squirrel Simulation 🔒
• 574. Winning Candidate 🔒
• 575. Distribute Candies
• 576. Out of Boundary Paths
• 577. Employee Bonus
• 578. Get Highest Answer Rate Question 🔒
• 579. Find Cumulative Salary of an Employee 🔒
• 580. Count Student Number in Departments 🔒
• 581. Shortest Unsorted Continuous Subarray
• 582. Kill Process 🔒
• 583. Delete Operation for Two Strings
• 584. Find Customer Referee
• 585. Investments in 2016
• 586. Customer Placing the Largest Number of Orders
• 587. Erect the Fence
• 588. Design In-Memory File System 🔒
• 589. N-ary Tree Preorder Traversal
• 590. N-ary Tree Postorder Traversal
• 591. Tag Validator
• 592. Fraction Addition and Subtraction
• 593. Valid Square
• 594. Longest Harmonious Subsequence
• 595. Big Countries
• 596. Classes With at Least 5 Students
• 597. Friend Requests I Overall Acceptance Rate 🔒
• 598. Range Addition II
• 599. Minimum Index Sum of Two Lists