LeetCode 05xx
LeetCode problems 500–599
LeetCode 05xx
| # | Problem | Difficulty | Time | Notes |
|---|---|---|---|---|
| 500 | Keyboard Row | 🟢 Easy | 1m | This problem asks us to determine which words in a given list can b… |
| 501 | Find Mode in Binary Search Tree | 🟢 Easy | 55s | This problem asks us to find the mode(s) in a Binary Search Tree (B… |
| 502 | IPO | 🔴 Hard | 1m 16s | The problem describes a scenario where we have a limited number of … |
| 503 | Next Greater Element II | 🟡 Medium | 1m 20s | The problem gives us a circular array nums, and for every element, … |
| 504 | Base 7 | 🟢 Easy | 38s | The problem asks us to convert a given integer num into its represe… |
| 505 | The Maze II | 🟡 Medium | 35s | This problem presents a maze represented as a 2D grid of size m x n… |
| 506 | Relative Ranks | 🟢 Easy | 1m 2s | The problem gives us an array named score, where each element repre… |
| 507 | Perfect Number | 🟢 Easy | 52s | This problem asks us to determine whether a given positive integer … |
| 508 | Most Frequent Subtree Sum | 🟡 Medium | 1m 7s | The problem asks us to compute the subtree sum for every node in a … |
| 509 | Fibonacci Number | 🟢 Easy | 56s | This problem asks us to compute the nth Fibonacci number. The Fibon… |
| 510 | Inorder Successor in BST II | 🟡 Medium | 1m 14s | This problem asks us to find the in-order successor of a given node… |
| 511 | Game Play Analysis I | 🟢 Easy | 1m 6s | This problem asks us to determine the first day each player logged … |
| 512 | Game Play Analysis II | 🟢 Easy | 3m 3s | The problem provides a database table named Activity. Each row repr… |
| 513 | Find Bottom Left Tree Value | 🟡 Medium | 49s | The problem asks us to find the leftmost value in the last row of a… |
| 514 | Freedom Trail | 🔴 Hard | 1m 22s | The problem models a circular dial, represented by the string ring,… |
| 515 | Find Largest Value in Each Tree Row | 🟡 Medium | 44s | The problem asks us to find the largest value in each row of a bina… |
| 516 | Longest Palindromic Subsequence | 🟡 Medium | 42s | The problem asks us to determine the length of the longest palindro… |
| 517 | Super Washing Machines | 🔴 Hard | 1m 56s | The problem gives us a line of washing machines, where each machine… |
| 518 | Coin Change II | 🟡 Medium | 1m 19s | This problem asks us to compute the number of distinct combinations… |
| 519 | Random Flip Matrix | 🟡 Medium | 3m 39s | The problem gives us an m x n matrix where every cell initially con… |
| 520 | Detect Capital | 🟢 Easy | 1m 21s | only conditions are satisfied. |
| 521 | Longest Uncommon Subsequence I | 🟢 Easy | 51s | The problem asks us to find the length of the longest uncommon subs… |
| 522 | Longest Uncommon Subsequence II | 🟡 Medium | 53s | The problem asks us to find the length of the longest string in the… |
| 523 | Continuous Subarray Sum | 🟡 Medium | 1m 7s | The problem asks us to determine whether an array contains a contin… |
| 524 | Longest Word in Dictionary through Deleting | 🟡 Medium | 57s | The problem gives us a source string s and a list of candidate word… |
| 525 | Contiguous Array | 🟡 Medium | 1m 24s | This problem asks us to find the maximum length of a contiguous sub… |
| 526 | Beautiful Arrangement | 🟡 Medium | 1m 9s | The problem asks us to count how many permutations of the integers … |
| 527 | Word Abbreviation | 🔴 Hard | 19m 21s | The problem asks us to compute minimal unique abbreviations for an … |
| 528 | Random Pick with Weight | 🟡 Medium | 52s | The problem asks us to design a data structure that supports weight… |
| 529 | Minesweeper | 🟡 Medium | 1m 9s | This problem asks us to simulate one move in the classic Minesweepe… |
| 530 | Minimum Absolute Difference in BST | 🟢 Easy | 1m 47s | This problem gives us the root node of a Binary Search Tree, abbrev… |
| 531 | Lonely Pixel I | 🟡 Medium | 1m 7s | The problem gives us a 2D grid called picture, where each cell cont… |
| 532 | K-diff Pairs in an Array | 🟡 Medium | 54s | The problem asks us to count how many unique pairs of integers in t… |
| 533 | Lonely Pixel II | 🟡 Medium | 2m 6s | The problem gives us a matrix called picture, where each cell conta… |
| 534 | Game Play Analysis III | 🟡 Medium | 33s | The problem is asking us to track cumulative game activity for each… |
| 535 | Encode and Decode TinyURL | 🟡 Medium | 40s | The problem asks us to implement a URL shortening service, similar … |
| 536 | Construct Binary Tree from String | 🟡 Medium | 1m 2s | This problem asks us to reconstruct a binary tree from a specially … |
| 537 | Complex Number Multiplication | 🟡 Medium | 50s | This problem asks us to multiply two complex numbers represented as… |
| 538 | Convert BST to Greater Tree | 🟡 Medium | 1m 6s | This problem asks us to transform a Binary Search Tree, abbreviated… |
| 539 | Minimum Time Difference | 🟡 Medium | 5m 19s | The problem gives a list of time points in 24-hour clock format, wh… |
| 540 | Single Element in a Sorted Array | 🟡 Medium | 2m 19s | The problem gives us a sorted integer array where every value appea… |
| 541 | Reverse String II | 🟢 Easy | 1m 22s | The problem requires us to manipulate a string s in a structured wa… |
| 542 | 01 Matrix | 🟡 Medium | 1m 8s | This problem gives us an m x n binary matrix where every cell conta… |
| 543 | Diameter of Binary Tree | 🟢 Easy | 1m 26s | The problem asks us to compute the diameter of a binary tree. The d… |
| 544 | Output Contest Matches | 🟡 Medium | 1m 5s | The problem asks us to simulate the structure of a playoff tourname… |
| 545 | Boundary of Binary Tree | 🟡 Medium | 1m 9s | This problem asks us to compute the boundary traversal of a binary … |
| 546 | Remove Boxes | 🔴 Hard | 1m 24s | The problem gives us an array called boxes, where each integer repr… |
| 547 | Number of Provinces | 🟡 Medium | 1m 52s | The problem is asking us to determine the number of provinces in a … |
| 548 | Split Array with Equal Sum | 🔴 Hard | 37s | The problem asks us to determine whether an integer array nums can … |
| 549 | Binary Tree Longest Consecutive Sequence II | 🟡 Medium | 1m 21s | This problem asks us to find the length of the longest consecutive … |
| 550 | Game Play Analysis IV | 🟡 Medium | 2m 24s | This problem is asking us to calculate a retention metric from a ta… |
| 551 | Student Attendance Record I | 🟢 Easy | 3m 32s | The problem gives us a string s where each character represents a s… |
| 552 | Student Attendance Record II | 🔴 Hard | 1m 10s | The problem asks us to count how many attendance records of length … |
| 553 | Optimal Division | 🟡 Medium | 1m 46s | The problem gives us an array of positive integers, and the array e… |
| 554 | Brick Wall | 🟡 Medium | 1m 11s | The problem gives us a wall made of multiple rows of bricks. Each r… |
| 555 | Split Concatenated Strings | 🟡 Medium | 1m 21s | The problem gives an array of strings, and we must arrange them int… |
| 556 | Next Greater Element III | 🟡 Medium | 1m 5s | This problem asks us to find the smallest integer that is strictly … |
| 557 | Reverse Words in a String III | 🟢 Easy | 47s | The problem requires reversing the characters of each individual wo… |
| 558 | Logical OR of Two Binary Grids Represented as Quad-Trees | 🟡 Medium | 1m 27s | This problem gives us two Quad-Trees, where each tree represents a … |
| 559 | Maximum Depth of N-ary Tree | 🟢 Easy | 1m 18s | The problem asks us to compute the maximum depth of an n-ary tree. … |
| 560 | Subarray Sum Equals K | 🟡 Medium | 1m 3s | The problem asks us to count how many contiguous, non-empty subarra… |
| 561 | Array Partition | 🟢 Easy | 1m 6s | The problem gives an array nums containing 2n integers. Our task is… |
| 562 | Longest Line of Consecutive One in Matrix | 🟡 Medium | 1m 13s | The problem gives us a binary matrix mat of size m x n, where every… |
| 563 | Binary Tree Tilt | 🟢 Easy | 1m 7s | The problem asks us to compute the total tilt of an entire binary t… |
| 564 | Find the Closest Palindrome | 🔴 Hard | 1m 29s | The problem gives us a string n representing a positive integer, an… |
| 565 | Array Nesting | 🟡 Medium | 2m 41s | The problem gives us an array nums that is guaranteed to be a permu… |
| 566 | Reshape the Matrix | 🟢 Easy | 40s | The problem is asking us to take an existing m x n matrix and "resh… |
| 567 | Permutation in String | 🟡 Medium | 3m 37s | This problem asks us to determine whether any permutation of s1 app… |
| 568 | Maximum Vacation Days | 🔴 Hard | 1m 11s | This problem asks us to maximize the total number of vacation days … |
| 569 | Median Employee Salary | 🔴 Hard | 1m 12s | The problem gives us an Employee table containing three columns: |
| 570 | Managers with at Least 5 Direct Reports | 🟡 Medium | 1m 8s | The Employee table represents a company hierarchy. Every row corres… |
| 571 | Find Median Given Frequency of Numbers | 🔴 Hard | 2m 31s | This problem provides a compressed representation of a dataset inst… |
| 572 | Subtree of Another Tree | 🟢 Easy | 1m 12s | This problem asks us to determine whether one binary tree appears a… |
| 573 | Squirrel Simulation | 🟡 Medium | 1m 6s | This problem models a squirrel collecting nuts in a 2D garden grid.… |
| 574 | Winning Candidate | 🟡 Medium | 1m 12s | This problem provides two database tables, Candidate and Vote, and … |
| 575 | Distribute Candies | 🟢 Easy | 1m 46s | This problem asks us to maximize the number of distinct candy types… |
| 576 | Out of Boundary Paths | 🟡 Medium | 1m 10s | This problem asks us to count how many different ways a ball can le… |
| 577 | Employee Bonus | 🟢 Easy | 55s | In this problem, we are given two database tables, Employee and Bon… |
| 578 | Get Highest Answer Rate Question | 🟡 Medium | 1m 16s | This problem asks us to analyze user interaction data stored in the… |
| 579 | Find Cumulative Salary of an Employee | 🔴 Hard | 41s | This problem asks us to compute a cumulative salary summary for eac… |
| 580 | Count Student Number in Departments | 🟡 Medium | 29s | This problem asks us to determine how many students are enrolled in… |
| 581 | Shortest Unsorted Continuous Subarray | 🟡 Medium | 1m 9s | The problem gives an integer array nums and asks for the length of … |
| 582 | Kill Process | 🟡 Medium | 1m 27s | This problem models processes in an operating system as a tree stru… |
| 583 | Delete Operation for Two Strings | 🟡 Medium | 40s | The problem asks us to determine the minimum number of deletion ste… |
| 584 | Find Customer Referee | 🟢 Easy | 40s | The problem provides a Customer table with three columns: id, name,… |
| 585 | Investments in 2016 | 🟡 Medium | 32s | Here’s a full, detailed technical solution guide for LeetCode 585 f… |
| 586 | Customer Placing the Largest Number of Orders | 🟢 Easy | 59s | The problem gives us a database table named Orders with two columns… |
| 587 | Erect the Fence | 🔴 Hard | 42s | This problem is asking us to find the convex hull of a set of point… |
| 588 | Design In-Memory File System | 🔴 Hard | 44s | The problem asks us to design an in-memory file system that simulat… |
| 589 | N-ary Tree Preorder Traversal | 🟢 Easy | 43s | The problem asks for a preorder traversal of an n-ary tree. In a pr… |
| 590 | N-ary Tree Postorder Traversal | 🟢 Easy | 1m 14s | This problem asks us to perform a postorder traversal on an n-ary t… |
| 591 | Tag Validator | 🔴 Hard | 1m 31s | This problem asks us to validate whether a given string represents … |
| 592 | Fraction Addition and Subtraction | 🟡 Medium | 43s | The problem requires computing the result of a mathematical express… |
| 593 | Valid Square | 🟡 Medium | 1m 11s | The problem gives four points in a 2D coordinate system and asks wh… |
| 594 | Longest Harmonious Subsequence | 🟢 Easy | 38s | The problem asks us to find the length of the longest harmonious su… |
| 595 | Big Countries | 🟢 Easy | 1m 6s | This problem asks us to query a database table named World and retu… |
| 596 | Classes With at Least 5 Students | 🟢 Easy | 39s | This problem is asking us to find classes in a school database that… |
| 597 | Friend Requests I: Overall Acceptance Rate | 🟢 Easy | 1m 16s | This problem asks us to compute the overall acceptance rate of frie… |
| 598 | Range Addition II | 🟢 Easy | 34s | The problem presents an m x n matrix M initialized with all zeros. … |
| 599 | Minimum Index Sum of Two Lists | 🟢 Easy | 33s | This problem is asking us to find the common elements between two l… |