LeetCode 06xx
LeetCode problems 600–699
LeetCode 06xx
| # | Problem | Difficulty | Time | Notes |
|---|---|---|---|---|
| 600 | Non-negative Integers without Consecutive Ones | 🔴 Hard | 2m 16s | That is a long-form technical guide request with multiple required … |
| 601 | Human Traffic of Stadium | 🔴 Hard | 1m 42s | The problem asks us to extract all consecutive records from a Stadi… |
| 602 | Friend Requests II: Who Has the Most Friends | 🟡 Medium | 1m 10s | The problem gives us a database table named RequestAccepted, where … |
| 603 | Consecutive Available Seats | 🟢 Easy | 1m 24s | The problem gives us a database table named Cinema with two columns… |
| 604 | Design Compressed String Iterator | 🟢 Easy | 33s | This problem asks us to implement a compressed string iterator. We … |
| 605 | Can Place Flowers | 🟢 Easy | 56s | The problem gives us a binary array called flowerbed, where: - 0 re… |
| 606 | Construct String from Binary Tree | 🟡 Medium | 1m 10s | This problem asks us to convert a binary tree into a string using a… |
| 607 | Sales Person | 🟢 Easy | 48s | This problem asks us to find the names of all salespeople who have … |
| 608 | Tree Node | 🟡 Medium | 1m 44s | This problem gives us a database table named Tree, where each row r… |
| 609 | Find Duplicate File in System | 🟡 Medium | 58s | The problem gives us a list of directory descriptions, where each s… |
| 610 | Triangle Judgement | 🟢 Easy | 36s | The problem is asking us to determine, for each row in a table call… |
| 611 | Valid Triangle Number | 🟡 Medium | 44s | The problem asks us to determine how many triplets from a given int… |
| 612 | Shortest Distance in a Plane | 🟡 Medium | 57s | This problem gives us a database table named Point2D, where every r… |
| 613 | Shortest Distance in a Line | 🟢 Easy | 1m 8s | This problem gives us a database table named Point that contains in… |
| 614 | Second Degree Follower | 🟡 Medium | 34s | This problem asks us to identify second-degree followers from a soc… |
| 615 | Average Salary: Departments VS Company | 🔴 Hard | 1m | This problem asks us to compare the average salary of each departme… |
| 616 | Add Bold Tag in String | 🟡 Medium | 58s | The problem asks us to insert HTML-style bold tags into a string wh… |
| 617 | Merge Two Binary Trees | 🟢 Easy | 1m 13s | This problem asks us to combine two binary trees into a single merg… |
| 618 | Students Report By Geography | 🔴 Hard | 30s | The problem asks us to transform a table of student names and their… |
| 619 | Biggest Single Number | 🟢 Easy | 52s | The problem gives us a database table named MyNumbers that contains… |
| 620 | Not Boring Movies | 🟢 Easy | 36s | The problem is asking us to query a database table called Cinema an… |
| 621 | Task Scheduler | 🟡 Medium | 51s | The Task Scheduler problem asks us to determine the minimum number … |
| 622 | Design Circular Queue | 🟡 Medium | 52s | The problem asks us to implement a circular queue, a fixed-size que… |
| 623 | Add One Row to Tree | 🟡 Medium | 44s | The problem asks us to modify a binary tree by adding a new row of … |
| 624 | Maximum Distance in Arrays | 🟡 Medium | 38s | The problem presents a list of m arrays, each individually sorted i… |
| 625 | Minimum Factorization | 🟡 Medium | 1m 3s | The problem asks us to find the smallest positive integer x such th… |
| 626 | Exchange Seats | 🟡 Medium | 41s | This problem asks us to swap the seat IDs of every two consecutive … |
| 627 | Swap Sex of Employees | 🟢 Easy | 42s | The problem is asking us to swap the sex values of all employees in… |
| 628 | Maximum Product of Three Numbers | 🟢 Easy | 58s | The problem gives an integer array nums and asks us to select exact… |
| 629 | K Inverse Pairs Array | 🔴 Hard | 34s | Here’s a full technical solution guide following your formatting ru… |
| 630 | Course Schedule III | 🔴 Hard | 1m 18s | The problem gives a list of online courses, where each course is re… |
| 631 | Design Excel Sum Formula | 🔴 Hard | 1m 11s | The problem asks us to design a miniature spreadsheet system simila… |
| 632 | Smallest Range Covering Elements from K Lists | 🔴 Hard | 1m 16s | The problem gives us k sorted integer lists, and we must find the s… |
| 633 | Sum of Square Numbers | 🟡 Medium | 1m 2s | The problem gives a non-negative integer c and asks whether it can … |
| 634 | Find the Derangement of An Array | 🟡 Medium | 56s | The problem asks us to count how many permutations of the numbers 1… |
| 635 | Design Log Storage System | 🟡 Medium | 35s | The problem is asking us to design a log storage system that suppor… |
| 636 | Exclusive Time of Functions | 🟡 Medium | 1m 7s | This problem models how functions execute on a single-threaded CPU.… |
| 637 | Average of Levels in Binary Tree | 🟢 Easy | 1m 10s | In this problem, we are given the root node of a binary tree, and w… |
| 638 | Shopping Offers | 🟡 Medium | 34s | This problem asks us to find the minimum cost to buy a set of items… |
| 639 | Decode Ways II | 🔴 Hard | 42s | The problem asks us to determine the number of ways an encoded stri… |
| 640 | Solve the Equation | 🟡 Medium | 41s | The problem is asking us to solve a linear equation containing a si… |
| 641 | Design Circular Deque | 🟡 Medium | 1m 7s | The problem asks us to design a circular double-ended queue, also c… |
| 642 | Design Search Autocomplete System | 🔴 Hard | 1m 18s | The problem asks us to design an autocomplete system that behaves s… |
| 643 | Maximum Average Subarray I | 🟢 Easy | 47s | The problem asks us to find the maximum average value among all con… |
| 644 | Maximum Average Subarray II | 🔴 Hard | 1m 5s | The problem asks us to find the maximum possible average value amon… |
| 645 | Set Mismatch | 🟢 Easy | 59s | The problem describes a corrupted set of integers. Originally, the … |
| 646 | Maximum Length of Pair Chain | 🟡 Medium | 1m 12s | The problem gives us an array of integer pairs, where each pair rep… |
| 647 | Palindromic Substrings | 🟡 Medium | 1m | The problem asks us to count how many palindromic substrings exist … |
| 648 | Replace Words | 🟡 Medium | 56s | The problem asks us to replace words in a sentence using a set of p… |
| 649 | Dota2 Senate | 🟡 Medium | 1m 5s | The problem describes a turn-based voting process between two parti… |
| 650 | 2 Keys Keyboard | 🟡 Medium | 57s | The problem is asking for the minimum number of operations required… |
| 651 | 4 Keys Keyboard | 🟡 Medium | 57s | The problem gives us a keyboard with four operations: - Press A, wh… |
| 652 | Find Duplicate Subtrees | 🟡 Medium | 1m 16s | The problem gives us the root of a binary tree and asks us to ident… |
| 653 | Two Sum IV - Input is a BST | 🟢 Easy | 1m 1s | This problem gives us the root of a Binary Search Tree (BST) and an… |
| 654 | Maximum Binary Tree | 🟡 Medium | 30s | The problem asks us to construct a maximum binary tree from a given… |
| 655 | Print Binary Tree | 🟡 Medium | 1m 5s | The problem asks us to transform a binary tree into a formatted 2D … |
| 656 | Coin Path | 🔴 Hard | 1m 19s | This problem asks us to find the cheapest valid path through an arr… |
| 657 | Robot Return to Origin | 🟢 Easy | 42s | This problem asks us to determine whether a robot, starting at the … |
| 658 | Find K Closest Elements | 🟡 Medium | 55s | The problem gives us a sorted integer array arr, along with two int… |
| 659 | Split Array into Consecutive Subsequences | 🟡 Medium | 1m 19s | The problem gives us a sorted integer array nums, and asks whether … |
| 660 | Remove 9 | 🔴 Hard | 1m 16s | The problem defines a modified sequence of positive integers where … |
| 661 | Image Smoother | 🟢 Easy | 45s | The problem is asking us to implement an image smoother, a filter t… |
| 662 | Maximum Width of Binary Tree | 🟡 Medium | 1m 8s | The problem asks us to compute the maximum width among all levels o… |
| 663 | Equal Tree Partition | 🟡 Medium | 1m 15s | The problem asks whether it is possible to split a binary tree into… |
| 664 | Strange Printer | 🔴 Hard | 55s | The problem describes a "strange printer" that can print sequences … |
| 665 | Non-decreasing Array | 🟡 Medium | 37s | The problem asks whether it is possible to transform a given intege… |
| 666 | Path Sum IV | 🟡 Medium | 1m 10s | This problem encodes a binary tree into a compact array of three-di… |
| 667 | Beautiful Arrangement II | 🟡 Medium | 1m 12s | The problem asks us to construct a permutation of the integers from… |
| 668 | Kth Smallest Number in Multiplication Table | 🔴 Hard | 1m 12s | The problem gives us an m x n multiplication table where each cell … |
| 669 | Trim a Binary Search Tree | 🟡 Medium | 1m 8s | LeetCode 669, Trim a Binary Search Tree, asks us to modify a binary… |
| 670 | Maximum Swap | 🟡 Medium | 38s | The problem asks us to take an integer num and find the maximum num… |
| 671 | Second Minimum Node In a Binary Tree | 🟢 Easy | 38s | The problem provides a special binary tree where each node either h… |
| 672 | Bulb Switcher II | 🟡 Medium | 1m 14s | The problem describes a room containing n light bulbs, where every … |
| 673 | Number of Longest Increasing Subsequence | 🟡 Medium | 1m 4s | The problem asks us to determine how many longest strictly increasi… |
| 674 | Longest Continuous Increasing Subsequence | 🟢 Easy | 1m 2s | The problem asks us to find the length of the longest strictly incr… |
| 675 | Cut Off Trees for Golf Event | 🔴 Hard | 1m 23s | The problem gives us a two dimensional grid representing a forest. … |
| 676 | Implement Magic Dictionary | 🟡 Medium | 1m 11s | The problem asks us to design a dictionary-like data structure that… |
| 677 | Map Sum Pairs | 🟡 Medium | 1m 7s | The problem asks us to design a custom data structure that behaves … |
| 678 | Valid Parenthesis String | 🟡 Medium | 32s | This problem is asking whether a string containing the characters '… |
| 679 | 24 Game | 🔴 Hard | 40s | The problem is asking us to determine whether it is possible to use… |
| 680 | Valid Palindrome II | 🟢 Easy | 59s | The problem asks whether a given string s can become a palindrome a… |
| 681 | Next Closest Time | 🟡 Medium | 1m 14s | The problem gives us a valid time string in the format "HH:MM" and … |
| 682 | Baseball Game | 🟢 Easy | 58s | This problem asks us to simulate a baseball scoring system with a s… |
| 683 | K Empty Slots | 🔴 Hard | 33s | Let's go through a complete, detailed technical solution guide for … |
| 684 | Redundant Connection | 🟡 Medium | 32s | The problem is asking us to identify a redundant edge in a graph th… |
| 685 | Redundant Connection II | 🔴 Hard | 38s | The problem asks us to identify a redundant edge in a directed grap… |
| 686 | Repeated String Match | 🟡 Medium | 34s | The problem asks us to determine the minimum number of times a stri… |
| 687 | Longest Univalue Path | 🟡 Medium | 1m 1s | This problem asks us to find the longest path in a binary tree wher… |
| 688 | Knight Probability in Chessboard | 🟡 Medium | 1m 23s | The problem asks us to compute the probability that a chess knight … |
| 689 | Maximum Sum of 3 Non-Overlapping Subarrays | 🔴 Hard | 1m 21s | The problem asks us to select exactly three non-overlapping subarra… |
| 690 | Employee Importance | 🟡 Medium | 1m 15s | The problem provides a collection of employees where each employee … |
| 691 | Stickers to Spell Word | 🔴 Hard | 34s | Let's dive deep into a detailed technical solution guide for LeetCo… |
| 692 | Top K Frequent Words | 🟡 Medium | 1m 16s | The problem gives us an array of strings called words and an intege… |
| 693 | Binary Number with Alternating Bits | 🟢 Easy | 41s | The problem asks us to determine whether the binary representation … |
| 694 | Number of Distinct Islands | 🟡 Medium | 1m 20s | The problem gives us a binary matrix called grid, where each cell c… |
| 695 | Max Area of Island | 🟡 Medium | 31s | The problem is asking us to find the largest connected area of land… |
| 696 | Count Binary Substrings | 🟢 Easy | 1m | The problem gives us a binary string, meaning the string contains o… |
| 697 | Degree of an Array | 🟢 Easy | 46s | The problem asks us to find the shortest contiguous subarray of an … |
| 698 | Partition to K Equal Sum Subsets | 🟡 Medium | 44s | The problem is asking whether an array of integers nums can be divi… |
| 699 | Falling Squares | 🔴 Hard | 1m 15s | The problem describes a simulation of squares falling onto the X-ax… |