LeetCode

Schedule

题目解法分类

2833

275

3108

27.14%

769/2833

18.85%

534/2833

ID

Topics

• 1 - 100
• 101 - 200
• 201 - 300
• 301 - 400
• 401 - 500
• 501 - 600
• 601 - 700
• 701 - 800
• 801 - 900
• 901 - 1000
• 1001 - 1100
• 1101 - 1200
• 1201 - 1300
• 1301 - 1400
• 1401 - 1500
• 1501 - 1600
• 1601 - 1700
• 1701 - 1800
• 1801 - 1900
• 1901 - 2000
• 2001 - 2100
• 2101 - 2200
• 2201 - 2300
• 2301 - 2400
• 2401 - 2500
• 2501 - 2600
• 2601 - 2700
• 2701 - 2800
• 2801 - 2900
• 2901 - 3000
• 3001 - 3100
• 3101 - 3108

• All
• Array
• Backtracking
• Biconnected Component
• Binary Indexed Tree
• Binary Search
• Binary Search Tree
• Binary Tree
• Bit Manipulation
• Bitmask
• Brainteaser
• Breadth-First Search
• Bucket Sort
• Combinatorics
• Concurrency
• Counting
• Counting Sort
• Data Stream
• Database
• Depth-First Search
• Design
• Divide and Conquer
• Doubly-Linked List
• Dynamic Programming
• Enumeration
• Eulerian Circuit
• Game Theory
• Geometry
• Graph
• Greedy
• Hash Function
• Hash Table
• Heap (Priority Queue)
• Interactive
• Iterator
• Line Sweep
• Linked List
• Math
• Matrix
• Memoization
• Merge Sort
• Minimum Spanning Tree
• Monotonic Queue
• Monotonic Stack
• Number Theory
• Ordered Set
• Prefix Sum
• Probability and Statistics
• Queue
• Quickselect
• Radix Sort
• Randomized
• Recursion
• Rejection Sampling
• Reservoir Sampling
• Rolling Hash
• Segment Tree
• Shell
• Shortest Path
• Simulation
• Sliding Window
• Sorting
• Stack
• String
• String Matching
• Strongly Connected Component
• Suffix Array
• Topological Sort
• Tree
• Trie
• Two Pointers
• Union Find

• Two Sum Easy
• Add Two Numbers Medium
• Longest Substring Without Repeating Characters Medium
• Median of Two Sorted Arrays Hard
• Longest Palindromic Substring Medium
• Zigzag Conversion Medium
• Reverse Integer Medium
• String to Integer (atoi) Medium
• Palindrome Number Easy
• Regular Expression Matching Hard
• Container With Most Water Medium
• Integer to Roman Medium
• Roman to Integer Easy
• Longest Common Prefix Easy
• 3Sum Medium
• 3Sum Closest Medium
• Letter Combinations of a Phone Number Medium
• 4Sum Medium
• Remove Nth Node From End of List Medium
• Valid Parentheses Easy
• Merge Two Sorted Lists Easy
• Generate Parentheses Medium
• Merge k Sorted Lists Hard
• Swap Nodes in Pairs Medium
• Reverse Nodes in k-Group Hard
• Remove Duplicates from Sorted Array Easy
• Remove Element Easy
• Find the Index of the First Occurrence in a String Easy
• Divide Two Integers Medium
• Substring with Concatenation of All Words Hard
• Next Permutation Medium
• Longest Valid Parentheses Hard
• Search in Rotated Sorted Array Medium
• Find First and Last Position of Element in Sorted Array Medium
• Search Insert Position Easy
• Valid Sudoku Medium
• Sudoku Solver Hard
• Count and Say Medium
• Combination Sum Medium
• Combination Sum II Medium
• First Missing Positive Hard
• Trapping Rain Water Hard
• Multiply Strings Medium
• Wildcard Matching Hard
• Jump Game II Medium
• Permutations Medium
• Permutations II Medium
• Rotate Image Medium
• Group Anagrams Medium
• Pow(x, n) Medium
• N-Queens Hard
• N-Queens II Hard
• Maximum Subarray Medium
• Spiral Matrix Medium
• Jump Game Medium
• Merge Intervals Medium
• Insert Interval Medium
• Length of Last Word Easy
• Spiral Matrix II Medium
• Permutation Sequence Hard
• Rotate List Medium
• Unique Paths Medium
• Unique Paths II Medium
• Minimum Path Sum Medium
• Valid Number Hard
• Plus One Easy
• Add Binary Easy
• Text Justification Hard
• Sqrt(x) Easy
• Climbing Stairs Easy
• Simplify Path Medium
• Edit Distance Medium
• Set Matrix Zeroes Medium
• Search a 2D Matrix Medium
• Sort Colors Medium
• Minimum Window Substring Hard
• Combinations Medium
• Subsets Medium
• Word Search Medium
• Remove Duplicates from Sorted Array II Medium
• Search in Rotated Sorted Array II Medium
• Remove Duplicates from Sorted List II Medium
• Remove Duplicates from Sorted List Easy
• Largest Rectangle in Histogram Hard
• Maximal Rectangle Hard
• Partition List Medium
• Scramble String Hard
• Merge Sorted Array Easy
• Gray Code Medium
• Subsets II Medium
• Decode Ways Medium
• Reverse Linked List II Medium
• Restore IP Addresses Medium
• Binary Tree Inorder Traversal Easy
• Unique Binary Search Trees II Medium
• Unique Binary Search Trees Medium
• Interleaving String Medium
• Validate Binary Search Tree Medium
• Recover Binary Search Tree Medium
• Same Tree Easy
• Symmetric Tree Easy
• Binary Tree Level Order Traversal Medium
• Binary Tree Zigzag Level Order Traversal Medium
• Maximum Depth of Binary Tree Easy
• Construct Binary Tree from Preorder and Inorder Traversal Medium
• Construct Binary Tree from Inorder and Postorder Traversal Medium
• Binary Tree Level Order Traversal II Medium
• Convert Sorted Array to Binary Search Tree Easy
• Convert Sorted List to Binary Search Tree Medium
• Balanced Binary Tree Easy
• Minimum Depth of Binary Tree Easy
• Path Sum Easy
• Path Sum II Medium
• Flatten Binary Tree to Linked List Medium
• Distinct Subsequences Hard
• Populating Next Right Pointers in Each Node Medium
• Populating Next Right Pointers in Each Node II Medium
• Pascal's Triangle Easy
• Pascal's Triangle II Easy
• Triangle Medium
• Best Time to Buy and Sell Stock Easy
• Best Time to Buy and Sell Stock II Medium
• Best Time to Buy and Sell Stock III Hard
• Binary Tree Maximum Path Sum Hard
• Valid Palindrome Easy
• Word Ladder II Hard
• Word Ladder Hard
• Longest Consecutive Sequence Medium
• Sum Root to Leaf Numbers Medium
• Surrounded Regions Medium
• Palindrome Partitioning Medium
• Palindrome Partitioning II Hard
• Clone Graph Medium
• Gas Station Medium
• Candy Hard
• Single Number Easy
• Single Number II Medium
• Copy List with Random Pointer Medium
• Word Break Medium
• Word Break II Hard
• Linked List Cycle Easy
• Linked List Cycle II Medium
• Reorder List Medium
• Binary Tree Preorder Traversal Easy
• Binary Tree Postorder Traversal Easy
• LRU Cache Medium
• Insertion Sort List Medium
• Sort List Medium
• Max Points on a Line Hard
• Evaluate Reverse Polish Notation Medium
• Reverse Words in a String Medium
• Maximum Product Subarray Medium
• Find Minimum in Rotated Sorted Array Medium
• Find Minimum in Rotated Sorted Array II Hard
• Min Stack Medium
• Binary Tree Upside Down Medium
• Read N Characters Given Read4 Easy
• Read N Characters Given read4 II - Call Multiple Times Hard
• Longest Substring with At Most Two Distinct Characters Medium
• Intersection of Two Linked Lists Easy
• One Edit Distance Medium
• Find Peak Element Medium
• Missing Ranges Easy
• Maximum Gap Hard
• Compare Version Numbers Medium
• Fraction to Recurring Decimal Medium
• Two Sum II - Input Array Is Sorted Medium
• Excel Sheet Column Title Easy
• Majority Element Easy
• Two Sum III - Data structure design Easy
• Excel Sheet Column Number Easy
• Factorial Trailing Zeroes Medium
• Binary Search Tree Iterator Medium
• Dungeon Game Hard
• Combine Two Tables Easy
• Second Highest Salary Medium
• Nth Highest Salary Medium
• Rank Scores Medium
• Largest Number Medium
• Consecutive Numbers Medium
• Employees Earning More Than Their Managers Easy
• Duplicate Emails Easy
• Customers Who Never Order Easy
• Department Highest Salary Medium
• Department Top Three Salaries Hard
• Reverse Words in a String II Medium
• Repeated DNA Sequences Medium
• Best Time to Buy and Sell Stock IV Hard
• Rotate Array Medium
• Reverse Bits Easy
• Number of 1 Bits Easy
• Word Frequency Medium
• Valid Phone Numbers Easy
• Transpose File Medium
• Tenth Line Easy
• Delete Duplicate Emails Easy
• Rising Temperature Easy
• House Robber Medium
• Binary Tree Right Side View Medium
• Number of Islands Medium
• Bitwise AND of Numbers Range Medium
• Happy Number Easy
• Remove Linked List Elements Easy
• Count Primes Medium
• Isomorphic Strings Easy
• Reverse Linked List Easy
• Course Schedule Medium
• Implement Trie (Prefix Tree) Medium
• Minimum Size Subarray Sum Medium
• Course Schedule II Medium
• Design Add and Search Words Data Structure Medium
• Word Search II Hard
• House Robber II Medium
• Shortest Palindrome Hard
• Kth Largest Element in an Array Medium
• Combination Sum III Medium
• Contains Duplicate Easy
• The Skyline Problem Hard
• Contains Duplicate II Easy
• Contains Duplicate III Hard
• Maximal Square Medium
• Count Complete Tree Nodes Medium
• Rectangle Area Medium
• Basic Calculator Hard
• Implement Stack using Queues Easy
• Invert Binary Tree Easy
• Basic Calculator II Medium
• Summary Ranges Easy
• Majority Element II Medium
• Kth Smallest Element in a BST Medium
• Power of Two Easy
• Implement Queue using Stacks Easy
• Number of Digit One Hard
• Palindrome Linked List Easy
• Lowest Common Ancestor of a Binary Search Tree Medium
• Lowest Common Ancestor of a Binary Tree Medium
• Delete Node in a Linked List Medium
• Product of Array Except Self Medium
• Sliding Window Maximum Hard
• Search a 2D Matrix II Medium
• Different Ways to Add Parentheses Medium
• Valid Anagram Easy
• Shortest Word Distance Easy
• Shortest Word Distance II Medium
• Shortest Word Distance III Medium
• Strobogrammatic Number Easy
• Strobogrammatic Number II Medium
• Strobogrammatic Number III Hard
• Group Shifted Strings Medium
• Count Univalue Subtrees Medium
• Flatten 2D Vector Medium
• Meeting Rooms Easy
• Meeting Rooms II Medium
• Factor Combinations Medium
• Verify Preorder Sequence in Binary Search Tree Medium
• Paint House Medium
• Binary Tree Paths Easy
• Add Digits Easy
• 3Sum Smaller Medium
• Single Number III Medium
• Graph Valid Tree Medium
• Trips and Users Hard
• Ugly Number Easy
• Ugly Number II Medium
• Paint House II Hard
• Palindrome Permutation Easy
• Palindrome Permutation II Medium
• Missing Number Easy
• Alien Dictionary Hard
• Closest Binary Search Tree Value Easy
• Encode and Decode Strings Medium
• Closest Binary Search Tree Value II Hard
• Integer to English Words Hard
• H-Index Medium
• H-Index II Medium
• Paint Fence Medium
• Find the Celebrity Medium
• First Bad Version Easy
• Perfect Squares Medium
• Wiggle Sort Medium
• Zigzag Iterator Medium
• Expression Add Operators Hard
• Move Zeroes Easy
• Peeking Iterator Medium
• Inorder Successor in BST Medium
• Walls and Gates Medium
• Find the Duplicate Number Medium
• Unique Word Abbreviation Medium
• Game of Life Medium
• Word Pattern Easy
• Word Pattern II Medium
• Nim Game Easy
• Flip Game Easy
• Flip Game II Medium
• Find Median from Data Stream Hard
• Best Meeting Point Hard
• Serialize and Deserialize Binary Tree Hard
• Binary Tree Longest Consecutive Sequence Medium
• Bulls and Cows Medium
• Longest Increasing Subsequence Medium
• Remove Invalid Parentheses Hard
• Smallest Rectangle Enclosing Black Pixels Hard
• Range Sum Query - Immutable Easy
• Range Sum Query 2D - Immutable Medium
• Number of Islands II Hard
• Additive Number Medium
• Range Sum Query - Mutable Medium
• Range Sum Query 2D - Mutable Hard
• Best Time to Buy and Sell Stock with Cooldown Medium
• Minimum Height Trees Medium
• Sparse Matrix Multiplication Medium
• Burst Balloons Hard
• Super Ugly Number Medium
• Binary Tree Vertical Order Traversal Medium
• Count of Smaller Numbers After Self Hard
• Remove Duplicate Letters Medium
• Shortest Distance from All Buildings Hard
• Maximum Product of Word Lengths Medium
• Bulb Switcher Medium
• Generalized Abbreviation Medium
• Create Maximum Number Hard
• Coin Change Medium
• Number of Connected Components in an Undirected Graph Medium
• Wiggle Sort II Medium
• Maximum Size Subarray Sum Equals k Medium
• Power of Three Easy
• Count of Range Sum Hard
• Odd Even Linked List Medium
• Longest Increasing Path in a Matrix Hard
• Patching Array Hard
• Verify Preorder Serialization of a Binary Tree Medium
• Reconstruct Itinerary Hard
• Largest BST Subtree Medium
• Increasing Triplet Subsequence Medium
• Self Crossing Hard
• Palindrome Pairs Hard
• House Robber III Medium
• Counting Bits Easy
• Nested List Weight Sum Medium
• Longest Substring with At Most K Distinct Characters Medium
• Flatten Nested List Iterator Medium
• Power of Four Easy
• Integer Break Medium
• Reverse String Easy
• Reverse Vowels of a String Easy
• Moving Average from Data Stream Easy
• Top K Frequent Elements Medium
• Design Tic-Tac-Toe Medium
• Intersection of Two Arrays Easy
• Intersection of Two Arrays II Easy
• Android Unlock Patterns Medium
• Data Stream as Disjoint Intervals Hard
• Design Snake Game Medium
• Russian Doll Envelopes Hard
• Design Twitter Medium
• Line Reflection Medium
• Count Numbers with Unique Digits Medium
• Rearrange String k Distance Apart Hard
• Logger Rate Limiter Easy
• Sort Transformed Array Medium
• Bomb Enemy Medium
• Design Hit Counter Medium
• Max Sum of Rectangle No Larger Than K Hard
• Nested List Weight Sum II Medium
• Water and Jug Problem Medium
• Find Leaves of Binary Tree Medium
• Valid Perfect Square Easy
• Largest Divisible Subset Medium
• Plus One Linked List Medium
• Range Addition Medium
• Sum of Two Integers Medium
• Super Pow Medium
• Find K Pairs with Smallest Sums Medium
• Guess Number Higher or Lower Easy
• Guess Number Higher or Lower II Medium
• Wiggle Subsequence Medium
• Combination Sum IV Medium
• Kth Smallest Element in a Sorted Matrix Medium
• Design Phone Directory Medium
• Insert Delete GetRandom O(1) Medium
• Insert Delete GetRandom O(1) - Duplicates allowed Hard
• Linked List Random Node Medium
• Ransom Note Easy
• Shuffle an Array Medium
• Mini Parser Medium
• Lexicographical Numbers Medium
• First Unique Character in a String Easy
• Longest Absolute File Path Medium
• Find the Difference Easy
• Elimination Game Medium
• Perfect Rectangle Hard
• Is Subsequence Easy
• UTF-8 Validation Medium
• Decode String Medium
• Longest Substring with At Least K Repeating Characters Medium
• Rotate Function Medium
• Integer Replacement Medium
• Random Pick Index Medium
• Evaluate Division Medium
• Nth Digit Medium
• Binary Watch Easy
• Remove K Digits Medium
• Frog Jump Hard
• Sum of Left Leaves Easy
• Convert a Number to Hexadecimal Easy
• Queue Reconstruction by Height Medium
• Trapping Rain Water II Hard
• Valid Word Abbreviation Easy
• Longest Palindrome Easy
• Split Array Largest SumHard
• Minimum Unique Word AbbreviationHard
• Fizz Buzz Easy
• Arithmetic Slices Medium
• Third Maximum Number Easy
• Add Strings Easy
• Partition Equal Subset Sum Medium
• Pacific Atlantic Water Flow Medium
• Sentence Screen Fitting Medium
• Battleships in a Board Medium
• Strong Password CheckerHard
• Maximum XOR of Two Numbers in an Array Medium
• Valid Word Square Easy
• Reconstruct Original Digits from English Medium
• Longest Repeating Character Replacement Medium
• Word SquaresHard
• Convert Binary Search Tree to Sorted Doubly Linked List Medium
• Construct Quad Tree Medium
• Serialize and Deserialize N-ary TreeHard
• N-ary Tree Level Order Traversal Medium
• Flatten a Multilevel Doubly Linked List Medium
• Encode N-ary Tree to Binary TreeHard
• All O`one Data StructureHard
• Minimum Genetic Mutation Medium
• Number of Segments in a String Easy
• Non-overlapping Intervals Medium
• Find Right Interval Medium
• Path Sum III Medium
• Find All Anagrams in a String Medium
• Ternary Expression Parser Medium
• K-th Smallest in Lexicographical OrderHard
• Arranging Coins Easy
• Find All Duplicates in an Array Medium
• String Compression Medium
• Sequence Reconstruction Medium
• Add Two Numbers II Medium
• Arithmetic Slices II - SubsequenceHard
• Number of Boomerangs Medium
• Find All Numbers Disappeared in an Array Easy
• Serialize and Deserialize BST Medium
• Delete Node in a BST Medium
• Sort Characters By Frequency Medium
• Minimum Number of Arrows to Burst Balloons Medium
• Minimum Moves to Equal Array Elements Medium
• 4Sum II Medium
• Assign Cookies Easy
• 132 Pattern Medium
• Circular Array Loop Medium
• Poor PigsHard
• Repeated Substring Pattern Easy
• LFU CacheHard
• Hamming Distance Easy
• Minimum Moves to Equal Array Elements II Medium
• Island Perimeter Easy
• Can I Win Medium
• Optimal Account BalancingHard
• Count The RepetitionsHard
• Unique Substrings in Wraparound String Medium
• Validate IP Address Medium
• Convex Polygon Medium
• Implement Rand10() Using Rand7() Medium
• Encode String with Shortest LengthHard
• Concatenated WordsHard
• Matchsticks to Square Medium
• Ones and Zeroes Medium
• Heaters Medium
• Number Complement Easy
• Total Hamming Distance Medium
• Generate Random Point in a Circle Medium
• Largest Palindrome ProductHard
• Sliding Window MedianHard
• Magical String Medium
• License Key Formatting Easy
• Smallest Good BaseHard
• Find Permutation Medium
• Max Consecutive Ones Easy
• Predict the Winner Medium
• Max Consecutive Ones II Medium
• Zuma GameHard
• Robot Room CleanerHard
• The Maze Medium
• Non-decreasing Subsequences Medium
• Construct the Rectangle Easy
• Reverse PairsHard
• Target Sum Medium
• Teemo Attacking Easy
• Next Greater Element I Easy
• Random Point in Non-overlapping Rectangles Medium
• Diagonal Traverse Medium
• The Maze IIIHard
• Keyboard Row Easy
• Find Mode in Binary Search Tree Easy
• IPOHard
• Next Greater Element II Medium
• Base 7 Easy
• The Maze II Medium
• Relative Ranks Easy
• Perfect Number Easy
• Most Frequent Subtree Sum Medium
• Fibonacci Number Easy
• Inorder Successor in BST II Medium
• Game Play Analysis I Easy
• Game Play Analysis II Easy
• Find Bottom Left Tree Value Medium
• Freedom TrailHard
• Find Largest Value in Each Tree Row Medium
• Longest Palindromic Subsequence Medium
• Super Washing MachinesHard
• Coin Change II Medium
• Random Flip Matrix Medium
• Detect Capital Easy
• Longest Uncommon Subsequence I Easy
• Longest Uncommon Subsequence II Medium
• Continuous Subarray Sum Medium
• Longest Word in Dictionary through Deleting Medium
• Contiguous Array Medium
• Beautiful Arrangement Medium
• Word AbbreviationHard
• Random Pick with Weight Medium
• Minesweeper Medium
• Minimum Absolute Difference in BST Easy
• Lonely Pixel I Medium
• K-diff Pairs in an Array Medium
• Lonely Pixel II Medium
• Game Play Analysis III Medium
• Encode and Decode TinyURL Medium
• Construct Binary Tree from String Medium
• Complex Number Multiplication Medium
• Convert BST to Greater Tree Medium
• Minimum Time Difference Medium
• Single Element in a Sorted Array Medium
• Reverse String II Easy
• 01 Matrix Medium
• Diameter of Binary Tree Easy
• Output Contest Matches Medium
• Boundary of Binary Tree Medium
• Remove BoxesHard
• Number of Provinces Medium
• Split Array with Equal SumHard
• Binary Tree Longest Consecutive Sequence II Medium
• Game Play Analysis IVMedium
• Student Attendance Record I Easy
• Student Attendance Record IIHard
• Optimal Division Medium
• Brick Wall Medium
• Split Concatenated Strings Medium
• Next Greater Element III Medium
• Reverse Words in a String III Easy
• Logical OR of Two Binary Grids Represented as Quad-Trees Medium
• Maximum Depth of N-ary Tree Easy
• Subarray Sum Equals K Medium
• Array Partition Easy
• Longest Line of Consecutive One in Matrix Medium
• Binary Tree Tilt Easy
• Find the Closest PalindromeHard
• Array Nesting Medium
• Reshape the Matrix Easy
• Permutation in String Medium
• Maximum Vacation DaysHard
• Median Employee Salary Hard
• Managers with at Least 5 Direct Reports Medium
• Find Median Given Frequency of Numbers Hard
• Subtree of Another Tree Easy
• Squirrel Simulation Medium
• Winning Candidate Medium
• Distribute Candies Easy
• Out of Boundary Paths Medium
• Employee Bonus Easy
• Get Highest Answer Rate Question Medium
• Find Cumulative Salary of an Employee Hard
• Count Student Number in Departments Medium
• Shortest Unsorted Continuous Subarray Medium
• Kill Process Medium
• Delete Operation for Two Strings Medium
• Find Customer Referee Easy
• Investments in 2016 Medium
• Customer Placing the Largest Number of Orders Easy
• Erect the FenceHard
• Design In-Memory File SystemHard
• N-ary Tree Preorder Traversal Easy
• N-ary Tree Postorder Traversal Easy
• Tag ValidatorHard
• Fraction Addition and Subtraction Medium
• Valid Square Medium
• Longest Harmonious Subsequence Easy
• Big Countries Easy
• Classes More Than 5 Students Easy
• Friend Requests I: Overall Acceptance Rate Easy
• Range Addition II Easy
• Minimum Index Sum of Two Lists Easy
• Non-negative Integers without Consecutive OnesHard
• Human Traffic of Stadium Hard
• Friend Requests II: Who Has the Most Friends Medium
• Consecutive Available Seats Easy
• Design Compressed String Iterator Easy
• Can Place Flowers Easy
• Construct String from Binary Tree Easy
• Sales Person Easy
• Tree Node Medium
• Find Duplicate File in System Medium
• Triangle Judgement Easy
• Valid Triangle Number Medium
• Shortest Distance in a Plane Medium
• Shortest Distance in a Line Easy
• Second Degree Follower Medium
• Average Salary: Departments VS Company Hard
• Add Bold Tag in String Medium
• Merge Two Binary Trees Easy
• Students Report By Geography Hard
• Biggest Single Number Easy
• Not Boring Movies Easy
• Task Scheduler Medium
• Design Circular Queue Medium
• Add One Row to Tree Medium
• Maximum Distance in Arrays Medium
• Minimum Factorization Medium
• Exchange Seats Medium
• Swap Salary Easy
• Maximum Product of Three Numbers Easy
• K Inverse Pairs ArrayHard
• Course Schedule IIIHard
• Design Excel Sum FormulaHard
• Smallest Range Covering Elements from K ListsHard
• Sum of Square Numbers Medium
• Find the Derangement of An Array Medium
• Design Log Storage System Medium
• Exclusive Time of Functions Medium
• Average of Levels in Binary Tree Easy
• Shopping Offers Medium
• Decode Ways IIHard
• Solve the Equation Medium
• Design Circular Deque Medium
• Design Search Autocomplete SystemHard
• Maximum Average Subarray I Easy
• Maximum Average Subarray IIHard
• Set Mismatch Easy
• Maximum Length of Pair Chain Medium
• Palindromic Substrings Medium
• Replace Words Medium
• Dota2 Senate Medium
• 2 Keys Keyboard Medium
• 4 Keys Keyboard Medium
• Find Duplicate Subtrees Medium
• Two Sum IV - Input is a BST Easy
• Maximum Binary Tree Medium
• Print Binary Tree Medium
• Coin PathHard
• Robot Return to Origin Easy
• Find K Closest Elements Medium
• Split Array into Consecutive Subsequences Medium
• Remove 9Hard
• Image Smoother Easy
• Maximum Width of Binary Tree Medium
• Equal Tree Partition Medium
• Strange PrinterHard
• Non-decreasing Array Medium
• Path Sum IV Medium
• Beautiful Arrangement II Medium
• Kth Smallest Number in Multiplication TableHard
• Trim a Binary Search Tree Medium
• Maximum Swap Medium
• Second Minimum Node In a Binary Tree Easy
• Bulb Switcher II Medium
• Number of Longest Increasing Subsequence Medium
• Longest Continuous Increasing Subsequence Easy
• Cut Off Trees for Golf EventHard
• Implement Magic Dictionary Medium
• Map Sum Pairs Medium
• Valid Parenthesis String Medium
• 24 GameHard
• Valid Palindrome II Easy
• Next Closest Time Medium
• Baseball Game Easy
• K Empty SlotsHard
• Redundant Connection Medium
• Redundant Connection IIHard
• Repeated String Match Medium
• Longest Univalue Path Medium
• Knight Probability in Chessboard Medium
• Maximum Sum of 3 Non-Overlapping SubarraysHard
• Employee Importance Medium
• Stickers to Spell Word Hard
• Top K Frequent Words Medium
• Binary Number with Alternating Bits Easy
• Number of Distinct Islands Medium
• Max Area of Island Medium
• Count Binary Substrings Easy
• Degree of an Array Easy
• Partition to K Equal Sum Subsets Medium
• Falling Squares Hard
• Search in a Binary Search Tree Easy
• Insert into a Binary Search Tree Medium
• Search in a Sorted Array of Unknown Size Medium
• Kth Largest Element in a Stream Easy
• Binary Search Easy
• Design HashSet Easy
• Design HashMap Easy
• Design Linked List Medium
• Insert into a Sorted Circular Linked List Medium
• To Lower Case Easy
• Random Pick with Blacklist Hard
• Number of Distinct Islands II Hard
• Minimum ASCII Delete Sum for Two Strings Medium
• Subarray Product Less Than K Medium
• Best Time to Buy and Sell Stock with Transaction Fee Medium
• Range Module Hard
• Max Stack Hard
• 1-bit and 2-bit Characters Easy
• Maximum Length of Repeated Subarray Medium
• Find K-th Smallest Pair DistanceHard
• Longest Word in Dictionary Medium
• Accounts Merge Medium
• Remove Comments Medium
• Candy Crush Medium
• Find Pivot Index Easy
• Split Linked List in Parts Medium
• Number of AtomsHard
• Minimum Window SubsequenceHard
• Self Dividing Numbers Easy
• My Calendar I Medium
• Count Different Palindromic SubsequencesHard
• My Calendar II Medium
• My Calendar IIIHard
• Flood Fill Easy
• Sentence Similarity Easy
• Asteroid Collision Medium
• Parse Lisp ExpressionHard
• Sentence Similarity II Medium
• Monotone Increasing Digits Medium
• Daily Temperatures Medium
• Delete and Earn Medium
• Cherry PickupHard
• Closest Leaf in a Binary Tree Medium
• Network Delay Time Medium
• Find Smallest Letter Greater Than Target Easy
• Prefix and Suffix SearchHard
• Min Cost Climbing Stairs Easy
• Largest Number At Least Twice of Others Easy
• Shortest Completing Word Easy
• Contain VirusHard
• Number Of Corner Rectangles Medium
• IP to CIDR Medium
• Open the Lock Medium
• Cracking the SafeHard
• Reach a Number Medium
• Pour Water Medium
• Pyramid Transition Matrix Medium
• Set Intersection Size At Least TwoHard
• Bold Words in String Medium
• Employee Free TimeHard
• Find Anagram Mappings Easy
• Special Binary StringHard
• Prime Number of Set Bits in Binary Representation Easy
• Partition Labels Medium
• Largest Plus Sign Medium
• Couples Holding HandsHard
• Toeplitz Matrix Easy
• Reorganize String Medium
• Max Chunks To Make Sorted IIHard
• Max Chunks To Make Sorted Medium
• Basic Calculator IVHard
• Jewels and Stones Easy
• Basic Calculator IIIHard
• Sliding Puzzle Hard
• Minimize Max Distance to Gas StationHard
• Global and Local Inversions Medium
• Split BST Medium
• Swap Adjacent in LR String Medium
• Swim in Rising WaterHard
• K-th Symbol in Grammar Medium
• Reaching PointsHard
• Rabbits in Forest Medium
• Transform to ChessboardHard
• Minimum Distance Between BST Nodes Easy
• Letter Case Permutation Medium
• Is Graph Bipartite? Medium
• K-th Smallest Prime Fraction Medium
• Cheapest Flights Within K Stops Medium
• Rotated Digits Medium
• Escape The Ghosts Medium
• Domino and Tromino Tiling Medium
• Custom Sort String Medium
• Number of Matching Subsequences Medium
• Preimage Size of Factorial Zeroes FunctionHard
• Valid Tic-Tac-Toe State Medium
• Number of Subarrays with Bounded Maximum Medium
• Rotate String Easy
• All Paths From Source to Target Medium
• Smallest Rotation with Highest ScoreHard
• Champagne Tower Medium
• Similar RGB Color Easy
• Minimum Swaps To Make Sequences Increasing Hard
• Find Eventual Safe StatesMedium
• Bricks Falling When HitHard
• Unique Morse Code WordsEasy
• Split Array With Same AverageHard
• Number of Lines To Write StringEasy
• Max Increase to Keep City SkylineMedium
• Soup ServingsMedium
• Expressive WordsMedium
• Chalkboard XOR GameHard
• Subdomain Visit CountMedium
• Largest Triangle AreaEasy
• Largest Sum of AveragesMedium
• Binary Tree PruningMedium
• Bus RoutesHard
• Ambiguous CoordinatesMedium
• Linked List ComponentsMedium
• Race CarHard
• Most Common Word * Easy
• Short Encoding of WordsMedium
• Shortest Distance to a Character Easy
• Card Flipping GameMedium
• Binary Trees With FactorsMedium
• Goat LatinEasy
• Friends Of Appropriate Ages Medium
• Most Profit Assigning WorkMedium
• Making A Large Island Hard
• Count Unique Characters of All Substrings of a Given StringHard
• Consecutive Numbers SumHard
• Positions of Large GroupsEasy
• Masking Personal InformationMedium
• Flipping an Image Easy
• Find And Replace in String Medium
• Sum of Distances in TreeHard
• Image OverlapMedium
• Rectangle Overlap Easy
• New 21 GameMedium
• Push DominoesMedium
• Similar String GroupsHard
• Magic Squares In GridMedium
• Keys and RoomsMedium
• Split Array into Fibonacci SequenceMedium
• Guess the Word Hard
• Backspace String Compare Easy
• Longest Mountain in Array Medium
• Hand of StraightsMedium
• Shortest Path Visiting All NodesHard
• Shifting LettersMedium
• Maximize Distance to Closest Person Medium
• Rectangle Area IIHard
• Loud and RichMedium
• Peak Index in a Mountain Array Medium
• Car Fleet Medium
• K-Similar StringsHard
• Exam Room Medium
• Score of Parentheses * Medium
• Minimum Cost to Hire K WorkersHard
• Mirror ReflectionMedium
• Buddy StringsEasy
• Lemonade ChangeEasy
• Score After Flipping MatrixMedium
• Shortest Subarray with Sum at Least K Hard
• All Nodes Distance K in Binary Tree ** Medium
• Shortest Path to Get All KeysHard
• Smallest Subtree with all the Deepest NodesMedium
• Prime PalindromeMedium
• Transpose Matrix Easy
• Binary GapEasy
• Reordered Power of 2Medium
• Advantage ShuffleMedium
• Minimum Number of Refueling StopsHard
• Leaf-Similar Trees Easy
• Length of Longest Fibonacci SubsequenceMedium
• Walking Robot SimulationMedium
• Koko Eating BananasMedium
• Middle of the Linked List Easy
• Stone GameMedium
• Nth Magical NumberHard
• Profitable SchemesHard
• Decoded String at IndexMedium
• Boats to Save People Medium
• Reachable Nodes In Subdivided GraphHard
• Projection Area of 3D ShapesEasy
• Uncommon Words from Two SentencesEasy
• Spiral Matrix III Medium
• Possible Bipartition Medium
• Super Egg DropHard
• Fair Candy Swap Easy
• Construct Binary Tree from Preorder and Postorder TraversalMedium
• Find and Replace Pattern Medium
• Sum of Subsequence WidthsHard
• Surface Area of 3D ShapesEasy
• Groups of Special-Equivalent StringsMedium
• All Possible Full Binary TreesMedium
• Maximum Frequency StackHard
• Monotonic ArrayEasy
• Increasing Order Search TreeEasy
• Bitwise ORs of SubarraysMedium
• Orderly QueueHard
• RLE IteratorMedium
• Online Stock Span Medium
• Numbers At Most N Given Digit SetHard
• Valid Permutations for DI SequenceHard
• Fruit Into BasketsMedium
• Sort Array By ParityEasy
• Super PalindromesHard
• Sum of Subarray MinimumsMedium
• Smallest Range IEasy
• Snakes and LaddersMedium
• Smallest Range IIMedium
• Online ElectionMedium
• Sort an ArrayMedium
• Cat and MouseHard
• X of a Kind in a Deck of CardsEasy
• Partition Array into Disjoint IntervalsMedium
• Word SubsetsMedium
• Reverse Only LettersEasy
• Maximum Sum Circular SubarrayMedium
• Complete Binary Tree InserterMedium
• Number of Music PlaylistsHard
• Minimum Add to Make Parentheses Valid Medium
• Sort Array By Parity IIEasy
• 3Sum With MultiplicityMedium
• Minimize Malware SpreadHard
• Long Pressed NameEasy
• Flip String to Monotone IncreasingMedium
• Three Equal PartsHard
• Minimize Malware Spread IIHard
• Unique Email AddressesEasy
• Binary Subarrays With SumMedium
• Minimum Falling Path SumMedium
• Beautiful ArrayMedium
• Number of Recent CallsEasy
• Shortest BridgeMedium
• Knight DialerMedium
• Stamping The SequenceHard
• Reorder Data in Log FilesMedium
• Range Sum of BST Easy
• Minimum Area RectangleMedium
• Distinct Subsequences IIHard
• Valid Mountain ArrayEasy
• DI String MatchEasy
• Find the Shortest SuperstringHard
• Delete Columns to Make SortedEasy
• Minimum Increment to Make Array UniqueMedium
• Validate Stack SequencesMedium
• Most Stones Removed with Same Row or ColumnMedium
• Bag of TokensMedium
• Largest Time for Given DigitsMedium
• Reveal Cards In Increasing OrderMedium
• Flip Equivalent Binary TreesMedium
• Largest Component Size by Common FactorHard
• Verifying an Alien Dictionary Easy
• Array of Doubled PairsMedium
• Delete Columns to Make Sorted IIMedium
• Tallest BillboardHard
• Prison Cells After N DaysMedium
• Check Completeness of a Binary TreeMedium
• Regions Cut By SlashesMedium
• Delete Columns to Make Sorted IIIHard
• N-Repeated Element in Size 2N ArrayEasy
• Maximum Width RampMedium
• Minimum Area Rectangle IIMedium
• Least Operators to Express NumberHard
• Univalued Binary TreeEasy
• Vowel SpellcheckerMedium
• Numbers With Same Consecutive DifferencesMedium
• Binary Tree CamerasHard
• Pancake SortingMedium
• Powerful IntegersMedium
• Flip Binary Tree To Match Preorder TraversalMedium
• Equal Rational NumbersHard
• K Closest Points to Origin Medium
• Subarray Sums Divisible by K Medium
• Odd Even JumpHard
• Largest Perimeter TriangleEasy
• Squares of a Sorted ArrayEasy
• Longest Turbulent SubarrayMedium
• Distribute Coins in Binary TreeMedium
• Unique Paths IIIHard
• Time Based Key-Value StoreMedium
• Triples with Bitwise AND Equal To ZeroHard
• Minimum Cost For TicketsMedium
• String Without AAA or BBBMedium
• Sum of Even Numbers After QueriesMedium
• Interval List Intersections Medium
• Vertical Order Traversal of a Binary Tree Hard
• Smallest String Starting From LeafMedium
• Add to Array-Form of IntegerEasy
• Satisfiability of Equality EquationsMedium
• Broken CalculatorMedium
• Subarrays with K Different IntegersHard
• Cousins in Binary Tree Easy
• Rotting OrangesMedium
• Minimum Number of K Consecutive Bit FlipsHard
• Number of Squareful ArraysHard
• Find the Town JudgeEasy
• Maximum Binary Tree IIMedium
• Available Captures for RookEasy
• Minimum Cost to Merge StonesHard
• Grid Illumination Hard
• Find Common Characters Easy
• Check If Word Is Valid After SubstitutionsMedium
• Max Consecutive Ones III * Medium
• Maximize Sum Of Array After K NegationsEasy
• Clumsy Factorial Medium
• Minimum Domino Rotations For Equal RowMedium
• Construct Binary Search Tree from Preorder Traversal Medium
• Complement of Base 10 Integer Easy
• Pairs of Songs With Total Durations Divisible by 60Medium
• Capacity To Ship Packages Within D DaysMedium
• Numbers With Repeated DigitsHard
• Partition Array Into Three Parts With Equal Sum Easy
• Best Sightseeing PairMedium
• Smallest Integer Divisible by KMedium
• Binary String With Substrings Representing 1 To NMedium
• Convert to Base -2Medium
• Binary Prefix Divisible By 5Easy
• Next Greater Node In Linked List Medium
• Number of Enclaves Medium
• Remove Outermost ParenthesesEasy
• Sum of Root To Leaf Binary NumbersEasy
• Camelcase MatchingMedium
• Video StitchingMedium
• Divisor GameEasy
• Maximum Difference Between Node and AncestorMedium
• Longest Arithmetic Subsequence Medium
• Recover a Tree From Preorder TraversalHard
• Two City SchedulingMedium
• Matrix Cells in Distance OrderEasy
• Maximum Sum of Two Non-Overlapping Subarrays Medium
• Stream of CharactersHard
• Moving Stones Until ConsecutiveMedium
• Coloring A BorderMedium
• Uncrossed LinesMedium
• Escape a Large MazeHard
• Valid BoomerangEasy
• Binary Search Tree to Greater Sum Tree Medium
• Minimum Score Triangulation of PolygonMedium
• Moving Stones Until Consecutive IIMedium
• Robot Bounded In CircleMedium
• Flower Planting With No AdjacentMedium
• Partition Array for Maximum SumMedium
• Longest Duplicate SubstringHard
• Customers Who Bought All Products Medium
• Last Stone WeightEasy
• Remove All Adjacent Duplicates In String Easy
• Longest String ChainMedium
• Last Stone Weight IIMedium
• Actors and Directors Who Cooperated At Least Three Times Easy
• Height CheckerEasy
• Grumpy Bookstore OwnerMedium
• Previous Permutation With One Swap Medium
• Distant BarcodesMedium
• Shortest Way to Form StringMedium
• Confusing NumberEasy
• Campus BikesMedium
• Minimize Rounding Error to Meet TargetMedium
• All Paths from Source Lead to DestinationMedium
• Missing Element in Sorted ArrayMedium
• Lexicographically Smallest Equivalent StringMedium
• Longest Repeating SubstringMedium
• Number of Valid SubarraysHard
• Fixed PointEasy
• Index Pairs of a StringEasy
• Campus Bikes IIMedium
• Digit Count in RangeHard
• Product Sales Analysis I Easy
• Product Sales Analysis II Easy
• Product Sales Analysis III Medium
• Greatest Common Divisor of StringsEasy
• Flip Columns For Maximum Number of Equal RowsMedium
• Adding Two Negabinary NumbersMedium
• Number of Submatrices That Sum to TargetHard
• Project Employees I Easy
• Project Employees II Easy
• Project Employees III Medium
• Occurrences After BigramEasy
• Letter Tile PossibilitiesMedium
• Insufficient Nodes in Root to Leaf PathsMedium
• Smallest Subsequence of Distinct Characters Medium
• Sales Analysis I Easy
• Sales Analysis II Easy
• Sales Analysis III Easy
• Sum of Digits in the Minimum NumberEasy
• High FiveEasy
• Brace ExpansionMedium
• Confusing Number IIHard
• Duplicate Zeros Easy
• Largest Values From LabelsMedium
• Shortest Path in Binary Matrix Medium
• Shortest Common Supersequence Hard
• Statistics from a Large SampleMedium
• Car PoolingMedium
• Find in Mountain ArrayHard
• Brace Expansion IIHard
• Game Play Analysis V Hard
• Unpopular Books Medium
• Two Sum Less Than KEasy
• Find K-Length Substrings With No Repeated CharactersMedium
• The Earliest Moment When Everyone Become Friends Medium
• Path With Maximum Minimum ValueMedium
• Distribute Candies to PeopleEasy
• Path In Zigzag Labelled Binary TreeMedium
• Filling Bookcase ShelvesMedium
• Parsing A Boolean ExpressionHard
• New Users Daily Count Medium
• Defanging an IP AddressEasy
• Corporate Flight BookingsMedium
• Delete Nodes And Return Forest Medium
• Maximum Nesting Depth of Two Valid Parentheses StringsMedium
• Highest Grade For Each Student Medium
• Reported Posts Easy
• Print in Order Easy
• Print FooBar Alternately Medium
• Print Zero Even Odd Medium
• Building H2O Medium
• Number of Days in a MonthEasy
• Remove Vowels from a StringEasy
• Maximum Average SubtreeMedium
• Divide Array Into Increasing SequencesHard
• Relative Sort ArrayEasy
• Lowest Common Ancestor of Deepest LeavesMedium
• Longest Well-Performing IntervalMedium
• Smallest Sufficient TeamHard
• Active Businesses Medium
• User Purchase Platform Hard
• Number of Equivalent Domino PairsEasy
• Shortest Path with Alternating ColorsMedium
• Minimum Cost Tree From Leaf ValuesMedium
• Maximum of Absolute Value ExpressionMedium
• Reported Posts II Medium
• Largest Unique NumberEasy
• Armstrong NumberEasy
• Connecting Cities With Minimum CostMedium
• Parallel Courses Medium
• N-th Tribonacci NumberEasy
• Alphabet Board PathMedium
• Largest 1-Bordered SquareMedium
• Stone Game IIMedium
• User Activity for the Past 30 Days I Easy
• User Activity for the Past 30 Days II Easy
• Longest Common Subsequence Medium
• Decrease Elements To Make Array ZigzagMedium
• Binary Tree Coloring GameMedium
• Snapshot ArrayMedium
• Longest Chunked Palindrome DecompositionHard
• Article Views I Easy
• Article Views II Medium
• Check If a Number Is Majority Element in a Sorted ArrayEasy
• Minimum Swaps to Group All 1's TogetherMedium
• Analyze User Website Visit PatternMedium
• String Transforms Into Another StringHard
• Day of the YearEasy
• Number of Dice Rolls With Target SumMedium
• Swap For Longest Repeated Character SubstringMedium
• Online Majority Element In SubarrayHard
• Market Analysis I Medium
• Market Analysis II Hard
• Find Words That Can Be Formed by CharactersEasy
• Maximum Level Sum of a Binary TreeMedium
• As Far from Land as PossibleMedium
• Last Substring in Lexicographical OrderHard
• Product Price at a Given Date Medium
• Single-Row KeyboardEasy
• Design File SystemMedium
• Minimum Cost to Connect SticksMedium
• Optimize Water Distribution in a VillageHard
• Invalid TransactionsMedium
• Compare Strings by Frequency of the Smallest CharacterMedium
• Remove Zero Sum Consecutive Nodes from Linked ListMedium
• Dinner Plate StacksHard
• Immediate Food Delivery I Easy
• Immediate Food Delivery II Medium
• Prime ArrangementsEasy
• Diet Plan PerformanceEasy
• Can Make Palindrome from SubstringMedium
• Number of Valid Words for Each PuzzleHard
• Reformat Department Table Easy
• Count Substrings with Only One Distinct LetterEasy
• Before and After PuzzleMedium
• Shortest Distance to Target ColorMedium
• Maximum Number of OnesHard
• Distance Between Bus StopsEasy
• Day of the WeekEasy
• Maximum Subarray Sum with One DeletionMedium
• Make Array Strictly IncreasingHard
• Design Bounded Blocking Queue Medium
• Maximum Number of BalloonsEasy
• Reverse Substrings Between Each Pair of ParenthesesMedium
• K-Concatenation Maximum SumMedium
• Critical Connections in a NetworkHard
• Monthly Transactions I Medium
• Tournament Winners Hard
• Fizz Buzz Multithreaded Medium
• How Many Apples Can You Put into the BasketEasy
• Minimum Knight MovesMedium
• Find Smallest Common Element in All RowsMedium
• Minimum Time to Build BlocksHard
• Minimum Absolute DifferenceEasy
• Ugly Number III Medium
• Smallest String With Swaps Medium
• Sort Items by Groups Respecting DependenciesHard
• Last Person to Fit in the Bus Medium
• Monthly Transactions II Medium
• Design Skiplist Medium
• Unique Number of OccurrencesEasy
• Get Equal Substrings Within BudgetMedium
• Remove All Adjacent Duplicates in String IIMedium
• Minimum Moves to Reach Target with RotationsHard
• Queries Quality and Percentage Easy
• Team Scores in Football Tournament Medium
• Intersection of Three Sorted ArraysEasy
• Two Sum BSTsMedium
• Stepping NumbersMedium
• Valid Palindrome III Hard
• Minimum Cost to Move Chips to The Same PositionEasy
• Longest Arithmetic Subsequence of Given DifferenceMedium
• Path with Maximum GoldMedium
• Count Vowels PermutationHard
• Split a String in Balanced StringsEasy
• Queens That Can Attack the KingMedium
• Dice Roll SimulationHard
• Maximum Equal FrequencyHard
• Report Contiguous Dates Hard
• The Dining Philosophers Medium
• Airplane Seat Assignment ProbabilityMedium
• Missing Number In Arithmetic ProgressionEasy
• Meeting SchedulerMedium
• Toss Strange CoinsMedium
• Divide ChocolateHard
• Check If It Is a Straight LineEasy
• Remove Sub-Folders from the FilesystemMedium
• Replace the Substring for Balanced StringMedium
• Maximum Profit in Job SchedulingHard
• Web CrawlerMedium
• Find Positive Integer Solution for a Given EquationMedium
• Circular Permutation in Binary RepresentationMedium
• Maximum Length of a Concatenated String with Unique CharactersMedium
• Tiling a Rectangle with the Fewest SquaresHard
• Number of Comments per Post Easy
• Web Crawler Multithreaded Medium
• Array TransformationEasy
• Design A LeaderboardMedium
• Tree DiameterMedium
• Palindrome RemovalHard
• Minimum Swaps to Make Strings EqualMedium
• Count Number of Nice SubarraysMedium
• Minimum Remove to Make Valid Parentheses Medium
• Check If It Is a Good ArrayHard
• Average Selling Price Easy
• Cells with Odd Values in a MatrixEasy
• Reconstruct a 2-Row Binary MatrixMedium
• Number of Closed Islands Medium
• Maximum Score Words Formed by LettersHard
• Encode NumberMedium
• Smallest Common RegionMedium
• Synonymous SentencesMedium
• Handshakes That Don't CrossHard
• Shift 2D GridEasy
• Find Elements in a Contaminated Binary TreeMedium
• Greatest Sum Divisible by ThreeMedium
• Minimum Moves to Move a Box to Their Target LocationHard
• Page Recommendations Medium
• Print Immutable Linked List in ReverseMedium
• Minimum Time Visiting All PointsEasy
• Count Servers that CommunicateMedium
• Search Suggestions SystemMedium
• Number of Ways to Stay in the Same Place After Some StepsHard
• All People Report to the Given Manager Medium
• HexspeakEasy
• Remove IntervalMedium
• Delete Tree NodesMedium
• Number of Ships in a RectangleHard
• Find Winner on a Tic Tac Toe GameEasy
• Number of Burgers with No Waste of IngredientsMedium
• Count Square Submatrices with All OnesMedium
• Palindrome Partitioning IIIHard
• Traffic Light Controlled Intersection Easy
• Students and Examinations Easy
• Subtract the Product and Sum of Digits of an IntegerEasy
• Group the People Given the Group Size They Belong ToMedium
• Find the Smallest Divisor Given a ThresholdMedium
• Minimum Number of Flips to Convert Binary Matrix to Zero MatrixHard
• Find the Start and End Number of Continuous Ranges Medium
• Iterator for CombinationMedium
• Element Appearing More Than 25% In Sorted ArrayEasy
• Remove Covered IntervalsMedium
• Minimum Falling Path Sum IIHard
• Convert Binary Number in a Linked List to IntegerEasy
• Sequential DigitsMedium
• Maximum Side Length of a Square with Sum Less than or Equal to ThresholdMedium
• Shortest Path in a Grid with Obstacles EliminationHard
• Weather Type in Each Country Easy
• Find Numbers with Even Number of DigitsEasy
• Divide Array in Sets of K Consecutive NumbersMedium
• Maximum Number of Occurrences of a SubstringMedium
• Maximum Candies You Can Get from BoxesHard
• Replace Elements with Greatest Element on Right SideEasy
• Sum of Mutated Array Closest to TargetMedium
• Number of Paths with Max Score Hard
• Deepest Leaves SumMedium
• Find the Team Size Easy
• Find N Unique Integers Sum up to Zero Easy
• All Elements in Two Binary Search TreesMedium
• Jump Game IIIMedium
• Verbal Arithmetic PuzzleHard
• Running Total for Different Genders Medium
• Decrypt String from Alphabet to Integer MappingEasy
• XOR Queries of a SubarrayMedium
• Get Watched Videos by Your FriendsMedium
• Minimum Insertion Steps to Make a String PalindromeHard
• Decompress Run-Length Encoded ListEasy
• Matrix Block SumMedium
• Sum of Nodes with Even-Valued GrandparentMedium
• Distinct Echo SubstringsHard
• Convert Integer to the Sum of Two No-Zero IntegersEasy
• Minimum Flips to Make a OR b Equal to cMedium
• Number of Operations to Make Network ConnectedMedium
• Minimum Distance to Type a Word Using Two FingersHard
• Restaurant Growth Medium
• Ads Performance Easy
• Maximum 69 NumberEasy
• Print Words VerticallyMedium
• Delete Leaves With a Given ValueMedium
• Minimum Number of Taps to Open to Water a GardenHard
• List the Products Ordered in a Period Easy
• Break a PalindromeMedium
• Sort the Matrix DiagonallyMedium
• Reverse Subarray To Maximize Array ValueHard
• Rank Transform of an ArrayEasy
• Remove Palindromic SubsequencesEasy
• Filter Restaurants by Vegan-Friendly, Price and DistanceMedium
• Find the City With the Smallest Number of Neighbors at a Threshold DistanceMedium
• Minimum Difficulty of a Job ScheduleHard
• Number of Transactions per Visit Hard
• The K Weakest Rows in a MatrixEasy
• Reduce Array Size to The HalfMedium
• Maximum Product of Splitted Binary TreeMedium
• Jump Game VHard
• Movie Rating Medium
• Number of Steps to Reduce a Number to ZeroEasy
• Number of Sub-arrays of Size K and Average Greater than or Equal to ThresholdMedium
• Angle Between Hands of a ClockMedium
• Jump Game IVHard
• Check If N and Its Double ExistEasy
• Minimum Number of Steps to Make Two Strings AnagramMedium
• Tweet Counts Per FrequencyMedium
• Maximum Students Taking ExamHard
• Students With Invalid Departments Easy
• Count Negative Numbers in a Sorted MatrixEasy
• Product of the Last K NumbersMedium
• Maximum Number of Events That Can Be AttendedMedium
• Construct Target Array With Multiple SumsHard
• Activity Participants Medium
• Sort Integers by The Number of 1 BitsEasy
• Apply Discount Every n OrdersMedium
• Number of Substrings Containing All Three CharactersMedium
• Count All Valid Pickup and Delivery OptionsHard
• Number of Days Between Two DatesEasy
• Validate Binary Tree NodesMedium
• Closest DivisorsMedium
• Largest Multiple of ThreeHard
• Number of Trusted Contacts of a Customer Medium
• How Many Numbers Are Smaller Than the Current NumberEasy
• Rank Teams by VotesMedium
• Linked List in Binary TreeMedium
• Minimum Cost to Make at Least One Valid Path in a GridHard
• Get the Second Most Recent Activity Hard
• Increasing Decreasing StringEasy
• Find the Longest Substring Containing Vowels in Even CountsMedium
• Longest ZigZag Path in a Binary TreeMedium
• Maximum Sum BST in Binary TreeHard
• Generate a String With Characters That Have Odd CountsEasy
• Number of Times Binary String Is Prefix-AlignedMedium
• Time Needed to Inform All EmployeesMedium
• Frog Position After T SecondsHard
• Replace Employee ID With The Unique Identifier Easy
• Find a Corresponding Node of a Binary Tree in a Clone of That TreeEasy
• Lucky Numbers in a MatrixEasy
• Design a Stack With Increment OperationMedium
• Balance a Binary Search TreeMedium
• Maximum Performance of a TeamHard
• Total Sales Amount by Year Hard
• Find the Distance Value Between Two ArraysEasy
• Cinema Seat AllocationMedium
• Sort Integers by The Power ValueMedium
• Pizza With 3n SlicesHard
• Create Target Array in the Given OrderEasy
• Four DivisorsMedium
• Check if There is a Valid Path in a GridMedium
• Longest Happy PrefixHard
• Capital Gain/Loss Medium
• Find Lucky Integer in an Array Easy
• Count Number of TeamsMedium
• Design Underground SystemMedium
• Find All Good StringsHard
• Customers Who Bought Products A and B but Not C Medium
• Count Largest GroupEasy
• Construct K Palindrome StringsMedium
• Circle and Rectangle Overlapping Medium
• Reducing DishesHard
• Minimum Subsequence in Non-Increasing OrderEasy
• Number of Steps to Reduce a Number in Binary Representation to OneMedium
• Longest Happy StringMedium
• Stone Game IIIHard
• Top Travellers Easy
• String Matching in an ArrayEasy
• Queries on a Permutation With KeyMedium
• HTML Entity ParserMedium
• Number of Ways to Paint N × 3 GridHard
• Find the Quiet Students in All Exams Hard
• Minimum Value to Get Positive Step by Step SumEasy
• Find the Minimum Number of Fibonacci Numbers Whose Sum Is KMedium
• The k-th Lexicographical String of All Happy Strings of Length nMedium
• Restore The ArrayHard
• Reformat The String Easy
• Display Table of Food Orders in a RestaurantMedium
• Minimum Number of Frogs CroakingMedium
• Build Array Where You Can Find The Maximum Exactly K ComparisonsHard
• NPV Queries Easy
• Maximum Score After Splitting a StringEasy
• Maximum Points You Can Obtain from CardsMedium
• Diagonal Traverse II Medium
• Constrained Subsequence SumHard
• Counting ElementsEasy
• Perform String ShiftsEasy
• Leftmost Column with at Least a OneMedium
• First Unique NumberMedium
• Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary TreeMedium
• Kids With the Greatest Number of CandiesEasy
• Max Difference You Can Get From Changing an IntegerMedium
• Check If a String Can Break Another StringMedium
• Number of Ways to Wear Different Hats to Each OtherHard
• Create a Session Bar Chart Easy
• Destination CityEasy
• Check If All 1's Are at Least Length K Places AwayEasy
• Longest Continuous Subarray With Absolute Diff Less Than or Equal to LimitMedium
• Find the Kth Smallest Sum of a Matrix With Sorted RowsHard
• Evaluate Boolean Expression Medium
• Build an Array With Stack OperationsMedium
• Count Triplets That Can Form Two Arrays of Equal XORMedium
• Minimum Time to Collect All Apples in a TreeMedium
• Number of Ways of Cutting a PizzaHard
• Apples & Oranges Medium
• Consecutive CharactersEasy
• Simplified FractionsMedium
• Count Good Nodes in Binary TreeMedium
• Form Largest Integer With Digits That Add up to TargetHard
• Number of Students Doing Homework at a Given TimeEasy
• Rearrange Words in a SentenceMedium
• People Whose List of Favorite Companies Is Not a Subset of Another ListMedium
• Maximum Number of Darts Inside of a Circular DartboardHard
• Active Users Medium
• Check If a Word Occurs As a Prefix of Any Word in a SentenceEasy
• Maximum Number of Vowels in a Substring of Given LengthMedium
• Pseudo-Palindromic Paths in a Binary TreeMedium
• Max Dot Product of Two SubsequencesHard
• Rectangles Area Medium
• Make Two Arrays Equal by Reversing SubarraysEasy
• Check If a String Contains All Binary Codes of Size KMedium
• Course Schedule IVMedium
• Cherry Pickup IIHard
• Maximum Product of Two Elements in an ArrayEasy
• Maximum Area of a Piece of Cake After Horizontal and Vertical CutsMedium
• Reorder Routes to Make All Paths Lead to the City ZeroMedium
• Probability of a Two Boxes Having The Same Number of Distinct BallsHard
• Calculate Salaries Medium
• Find All The Lonely NodesEasy
• Shuffle the ArrayEasy
• The k Strongest Values in an ArrayMedium
• Design Browser HistoryMedium
• Paint House IIIHard
• Delete N Nodes After M Nodes of a Linked ListEasy
• Final Prices With a Special Discount in a ShopEasy
• Subrectangle QueriesMedium
• Find Two Non-overlapping Sub-arrays Each With Target SumMedium
• Allocate MailboxesHard
• Sales by Day of the Week Hard
• Running Sum of 1d ArrayEasy
• Least Number of Unique Integers after K RemovalsMedium
• Minimum Number of Days to Make m BouquetsMedium
• Kth Ancestor of a Tree NodeHard
• Group Sold Products By The Date Easy
• Clone Binary Tree With Random PointerMedium
• XOR Operation in an ArrayEasy
• Making File Names UniqueMedium
• Avoid Flood in The CityMedium
• Find Critical and Pseudo-Critical Edges in Minimum Spanning TreeHard
• Clone N-ary TreeMedium
• Average Salary Excluding the Minimum and Maximum SalaryEasy
• The kth Factor of nMedium
• Longest Subarray of 1's After Deleting One ElementMedium
• Parallel Courses IIHard
• Friendly Movies Streamed Last Month Easy
• Path CrossingEasy
• Check If Array Pairs Are Divisible by kMedium
• Number of Subsequences That Satisfy the Given Sum ConditionMedium
• Max Value of EquationHard
• Design a File Sharing SystemMedium
• Countries You Can Safely Invest In Medium
• Can Make Arithmetic Progression From SequenceEasy
• Last Moment Before All Ants Fall Out of a PlankMedium
• Count Submatrices With All OnesMedium
• Minimum Possible Integer After at Most K Adjacent Swaps On DigitsHard
• Find Root of N-Ary TreeMedium
• Reformat DateEasy
• Range Sum of Sorted Subarray SumsMedium
• Minimum Difference Between Largest and Smallest Value in Three MovesMedium
• Stone Game IVHard
• Customer Order Frequency Easy
• Number of Good PairsEasy
• Number of Substrings With Only 1sMedium
• Path with Maximum ProbabilityMedium
• Best Position for a Service CentreHard
• Move Sub-Tree of N-Ary TreeHard
• Find Users With Valid E-Mails Easy
• Water BottlesEasy
• Number of Nodes in the Sub-Tree With the Same LabelMedium
• Maximum Number of Non-Overlapping SubstringsHard
• Find a Value of a Mysterious Function Closest to TargetHard
• Diameter of N-Ary TreeMedium
• Count Odd Numbers in an Interval RangeEasy
• Number of Sub-arrays With Odd SumMedium
• Number of Good Ways to Split a StringMedium
• Minimum Number of Increments on Subarrays to Form a Target ArrayHard
• Patients With a Condition Easy
• Shuffle StringEasy
• Minimum Suffix FlipsMedium
• Number of Good Leaf Nodes PairsMedium
• String Compression II Hard
• The Most Recent Three Orders Medium
• Find the Index of the Large IntegerMedium
• Count Good TripletsEasy
• Find the Winner of an Array GameMedium
• Minimum Swaps to Arrange a Binary GridMedium
• Get the Maximum ScoreHard
• Guess the Majority in a Hidden ArrayMedium
• Kth Missing Positive Number Easy
• Can Convert String in K MovesMedium
• Minimum Insertions to Balance a Parentheses StringMedium
• Find Longest Awesome SubstringHard
• Fix Product Name Format Easy
• Make The String GreatEasy
• Find Kth Bit in Nth Binary StringMedium
• Maximum Number of Non-Overlapping Subarrays With Sum Equals TargetMedium
• Minimum Cost to Cut a StickHard
• The Most Similar Path in a GraphHard
• The Most Recent Orders for Each Product Medium
• Three Consecutive OddsEasy
• Minimum Operations to Make Array EqualMedium
• Magnetic Force Between Two BallsMedium
• Minimum Number of Days to Eat N OrangesHard
• Strings Differ by One CharacterMedium
• Bank Account Summary Medium
• Thousand SeparatorEasy
• Minimum Number of Vertices to Reach All NodesMedium
• Minimum Numbers of Function Calls to Make Target ArrayMedium
• Detect Cycles in 2D GridMedium
• Most Visited Sector in a Circular TrackEasy
• Maximum Number of Coins You Can GetMedium
• Find Latest Group of Size MMedium
• Stone Game VHard
• Put Boxes Into the Warehouse IMedium
• Unique Orders and Customers Per Month Easy
• Detect Pattern of Length M Repeated K or More TimesEasy
• Maximum Length of Subarray With Positive ProductMedium
• Minimum Number of Days to Disconnect IslandHard
• Number of Ways to Reorder Array to Get Same BSTHard
• Dot Product of Two Sparse Vectors Medium
• Warehouse Manager Easy
• Matrix Diagonal SumEasy
• Number of Ways to Split a StringMedium
• Shortest Subarray to be Removed to Make Array SortedMedium
• Count All Possible RoutesHard
• Replace All ?'s to Avoid Consecutive Repeating CharactersEasy
• Number of Ways Where Square of Number Is Equal to Product of Two NumbersMedium
• Minimum Time to Make Rope ColorfulMedium
• Remove Max Number of Edges to Keep Graph Fully TraversableHard
• Put Boxes Into the Warehouse IIMedium
• Customer Who Visited but Did Not Make Any Transactions Easy
• Special Positions in a Binary MatrixEasy
• Count Unhappy FriendsMedium
• Min Cost to Connect All PointsMedium
• Check If String Is Transformable With Substring Sort OperationsHard
• Binary Search Tree Iterator IIMedium
• Bank Account Summary II Easy
• Sum of All Odd Length SubarraysEasy
• Maximum Sum Obtained of Any PermutationMedium
• Make Sum Divisible by PMedium
• Strange Printer IIHard
• Rearrange Spaces Between WordsEasy
• Split a String Into the Max Number of Unique SubstringsMedium
• Maximum Non Negative Product in a MatrixMedium
• Minimum Cost to Connect Two Groups of PointsHard
• The Most Frequently Ordered Products for Each Customer Medium
• Build Binary Expression Tree From Infix ExpressionHard
• Crawler Log FolderEasy
• Maximum Profit of Operating a Centennial WheelMedium
• Throne InheritanceMedium
• Maximum Number of Achievable Transfer Requests Hard
• Find Nearest Right Node in Binary TreeMedium
• Design Parking SystemEasy
• Alert Using Same Key-Card Three or More Times in a One Hour PeriodMedium
• Find Valid Matrix Given Row and Column SumsMedium
• Find Servers That Handled Most Number of RequestsHard
• Sellers With No Sales Easy
• Special Array With X Elements Greater Than or Equal XEasy
• Even Odd TreeMedium
• Maximum Number of Visible Points Hard
• Minimum One Bit Operations to Make Integers ZeroHard
• Check If Two Expression Trees are EquivalentMedium
• Find the Missing IDs Medium
• Maximum Nesting Depth of the ParenthesesEasy
• Maximal Network RankMedium
• Split Two Strings to Make PalindromeMedium
• Count Subtrees With Max Distance Between CitiesHard
• Maximum Font to Fit a Sentence in a ScreenMedium
• Mean of Array After Removing Some ElementsEasy
• Coordinate With Maximum Network QualityMedium
• Number of Sets of K Non-Overlapping Line SegmentsMedium
• Fancy SequenceHard
• All Valid Triplets That Can Represent a Country Easy
• Largest Substring Between Two Equal CharactersEasy
• Lexicographically Smallest String After Applying OperationsMedium
• Best Team With No ConflictsMedium
• Graph Connectivity With ThresholdHard
• Design an Expression Tree With Evaluate FunctionMedium
• Slowest KeyEasy
• Arithmetic SubarraysMedium
• Path With Minimum EffortMedium
• Rank Transform of a MatrixHard
• Percentage of Users Attended a Contest Easy
• Add Two Polynomials Represented as Linked ListsMedium
• Hopper Company Queries I Hard
• Sort Array by Increasing FrequencyEasy
• Widest Vertical Area Between Two Points Containing No PointsEasy
• Count Substrings That Differ by One CharacterMedium
• Number of Ways to Form a Target String Given a DictionaryHard
• Check Array Formation Through ConcatenationEasy
• Count Sorted Vowel StringsMedium
• Furthest Building You Can ReachMedium
• Kth Smallest InstructionsHard
• Lowest Common Ancestor of a Binary Tree IIMedium
• Hopper Company Queries II Hard
• Get Maximum in Generated ArrayEasy
• Minimum Deletions to Make Character Frequencies UniqueMedium
• Sell Diminishing-Valued Colored BallsMedium
• Create Sorted Array through InstructionsHard
• Lowest Common Ancestor of a Binary Tree III Medium
• Hopper Company Queries III Hard
• Defuse the BombEasy
• Minimum Deletions to Make String BalancedMedium
• Minimum Jumps to Reach HomeMedium
• Distribute Repeating IntegersHard
• Design an Ordered StreamEasy
• Determine if Two Strings Are Close Medium
• Minimum Operations to Reduce X to ZeroMedium
• Maximize Grid HappinessHard
• Correct a Binary TreeMedium
• Average Time of Process per Machine Easy
• Check If Two String Arrays are EquivalentEasy
• Smallest String With A Given Numeric ValueMedium
• Ways to Make a Fair ArrayMedium
• Minimum Initial Energy to Finish TasksHard
• Change the Root of a Binary TreeMedium
• Fix Names in a Table Easy
• Maximum Repeating SubstringEasy
• Merge In Between Linked ListsMedium
• Design Front Middle Back QueueMedium
• Minimum Number of Removals to Make Mountain ArrayHard
• Richest Customer WealthEasy
• Find the Most Competitive SubsequenceMedium
• Minimum Moves to Make Array ComplementaryMedium
• Minimize Deviation in ArrayHard
• Lowest Common Ancestor of a Binary Tree IVMedium
• Product's Worth Over Invoices Easy
• Goal Parser InterpretationEasy
• Max Number of K-Sum PairsMedium
• Concatenation of Consecutive Binary NumbersMedium
• Minimum IncompatibilityHard
• Longest Palindromic Subsequence IIMedium
• Invalid Tweets Easy
• Count the Number of Consistent StringsEasy
• Sum of Absolute Differences in a Sorted ArrayMedium
• Stone Game VIMedium
• Delivering Boxes from Storage to PortsHard
• Count of Matches in TournamentEasy
• Partitioning Into Minimum Number Of Deci-Binary NumbersMedium
• Stone Game VIIMedium
• Maximum Height by Stacking Cuboids Hard
• Count Ways to Distribute CandiesHard
• Daily Leads and Partners Easy
• Reformat Phone NumberEasy
• Maximum Erasure ValueMedium
• Jump Game VIMedium
• Checking Existence of Edge Length Limited PathsHard
• Number of Distinct Substrings in a StringMedium
• Number of Calls Between Two Persons Medium
• Number of Students Unable to Eat LunchEasy
• Average Waiting Time Medium
• Maximum Binary String After ChangeMedium
• Minimum Adjacent Swaps for K Consecutive OnesHard
• Determine if String Halves Are AlikeEasy
• Maximum Number of Eaten ApplesMedium
• Where Will the Ball FallMedium
• Maximum XOR With an Element From ArrayHard
• Largest Subarray Length KEasy
• Biggest Window Between Visits Medium
• Maximum Units on a TruckEasy
• Count Good MealsMedium
• Ways to Split Array Into Three SubarraysMedium
• Minimum Operations to Make a SubsequenceHard
• Sum Of Special Evenly-Spaced Elements In ArrayHard
• Count Apples and Oranges Medium
• Calculate Money in Leetcode BankEasy
• Maximum Score From Removing SubstringsMedium
• Construct the Lexicographically Largest Valid SequenceMedium
• Number Of Ways To Reconstruct A TreeHard
• Decode XORed ArrayEasy
• Swapping Nodes in a Linked List Medium
• Minimize Hamming Distance After Swap OperationsMedium
• Find Minimum Time to Finish All JobsHard
• Checking Existence of Edge Length Limited Paths IIHard
• Number Of Rectangles That Can Form The Largest SquareEasy
• Tuple with Same ProductMedium
• Largest Submatrix With RearrangementsMedium
• Cat and Mouse IIHard
• Find Followers Count Easy
• Shortest Path to Get FoodMedium
• The Number of Employees Which Report to Each Employee Easy
• Find the Highest AltitudeEasy
• Minimum Number of People to TeachMedium
• Decode XORed PermutationMedium
• Count Ways to Make Array With ProductHard
• Latest Time by Replacing Hidden DigitsEasy
• Change Minimum Characters to Satisfy One of Three ConditionsMedium
• Find Kth Largest XOR Coordinate ValueMedium
• Building BoxesHard
• Find Distance in a Binary TreeMedium
• Find Total Time Spent by Each Employee Easy
• Maximum Number of Balls in a BoxEasy
• Restore the Array From Adjacent PairsMedium
• Can You Eat Your Favorite Candy on Your Favorite Day?Medium
• Palindrome Partitioning IVHard
• Maximum Subarray Sum After One OperationMedium
• Leetflex Banned Accounts Medium
• Sum of Unique ElementsEasy
• Maximum Absolute Sum of Any SubarrayMedium
• Minimum Length of String After Deleting Similar EndsMedium
• Maximum Number of Events That Can Be Attended IIHard
• Check if Array Is Sorted and RotatedEasy
• Maximum Score From Removing StonesMedium
• Largest Merge Of Two StringsMedium
• Closest Subsequence SumHard
• Design Most Recently Used QueueMedium
• Recyclable and Low Fat Products Easy
• Minimum Changes To Make Alternating Binary StringEasy
• Count Number of Homogenous SubstringsMedium
• Minimum Limit of Balls in a BagMedium
• Minimum Degree of a Connected Trio in a GraphHard
• Buildings With an Ocean View Medium
• Longest Nice SubstringEasy
• Form Array by Concatenating Subarrays of Another Array Medium
• Map of Highest PeakMedium
• Tree of CoprimesHard
• Find the Subtasks That Did Not Execute Hard
• Merge Strings Alternately Easy
• Minimum Number of Operations to Move All Balls to Each BoxMedium
• Maximum Score from Performing Multiplication OperationsHard
• Maximize Palindrome Length From SubsequencesHard
• Sort Features by PopularityMedium
• Count Items Matching a RuleEasy
• Closest Dessert CostMedium
• Equal Sum Arrays With Minimum Number of OperationsMedium
• Car Fleet II Hard
• Product's Price for Each Store Easy
• Shortest Path in a Hidden GridMedium
• Find Nearest Point That Has the Same X or Y Coordinate Easy
• Check if Number is a Sum of Powers of ThreeMedium
• Sum of Beauty of All SubstringsMedium
• Count Pairs Of NodesHard
• Grand Slam Titles Medium
• Check if Binary String Has at Most One Segment of OnesEasy
• Minimum Elements to Add to Form a Given SumMedium
• Number of Restricted Paths From First to Last NodeMedium
• Make the XOR of All Segments Equal to ZeroHard
• Maximize the Beauty of the GardenHard
• Primary Department for Each Employee Easy
• Check if One String Swap Can Make Strings EqualEasy
• Find Center of Star GraphEasy
• Maximum Average Pass RatioMedium
• Maximum Score of a Good SubarrayHard
• Count Pairs of Equal Substrings With Minimum DifferenceMedium
• Rearrange Products Table Easy
• Second Largest Digit in a StringEasy
• Design Authentication ManagerMedium
• Maximum Number of Consecutive Values You Can MakeMedium
• Maximize Score After N OperationsHard
• Maximum Ascending Subarray SumEasy
• Number of Orders in the Backlog Medium
• Maximum Value at a Given Index in a Bounded ArrayMedium
• Count Pairs With XOR in a RangeHard
• Implement Trie II (Prefix Tree)Medium
• Number of Different Integers in a StringEasy
• Minimum Number of Operations to Reinitialize a PermutationMedium
• Evaluate the Bracket Pairs of a StringMedium
• Maximize Number of Nice DivisorsHard
• Ad-Free Sessions Easy
• Minimum Path Cost in a Hidden GridMedium
• Find Interview Candidates Medium
• Determine Color of a Chessboard SquareEasy
• Sentence Similarity IIIMedium
• Count Nice Pairs in an ArrayMedium
• Maximum Number of Groups Getting Fresh DonutsHard
• Truncate SentenceEasy
• Finding the Users Active MinutesMedium
• Minimum Absolute Sum DifferenceMedium
• Number of Different Subsequences GCDsHard
• Maximum Number of Accepted InvitationsMedium
• Find Customers With Positive Revenue this Year Easy
• Sign of the Product of an ArrayEasy
• Find the Winner of the Circular GameMedium
• Minimum Sideway JumpsMedium
• Finding MK AverageHard
• Faulty SensorEasy
• Minimum Operations to Make the Array IncreasingEasy
• Queries on Number of Points Inside a CircleMedium
• Maximum XOR for Each QueryMedium
• Minimum Number of Operations to Make String SortedHard
• Maximum Transaction Each Day Medium
• Check if the Sentence Is PangramEasy
• Maximum Ice Cream BarsMedium
• Single-Threaded CPUMedium
• Find XOR Sum of All Pairs Bitwise ANDHard
• Remove Duplicates From an Unsorted Linked ListMedium
• Sum of Digits in Base KEasy
• Frequency of the Most Frequent ElementMedium
• Longest Substring Of All Vowels in OrderMedium
• Maximum Building HeightHard
• League Statistics Medium
• Next Palindrome Using Same DigitsHard
• Suspicious Bank Accounts Medium
• Replace All Digits with CharactersEasy
• Seat Reservation ManagerMedium
• Maximum Element After Decreasing and RearrangingMedium
• Closest RoomHard
• Minimum Distance to the Target ElementEasy
• Splitting a String Into Descending Consecutive ValuesMedium
• Minimum Adjacent Swaps to Reach the Kth Smallest NumberMedium
• Minimum Interval to Include Each QueryHard
• Distinct Numbers in Each SubarrayMedium
• Convert Date Format Easy
• Maximum Population YearEasy
• Maximum Distance Between a Pair of ValuesMedium
• Maximum Subarray Min-ProductMedium
• Largest Color Value in a Directed Graph Hard
• Longest Word With All PrefixesMedium
• Sorting the SentenceEasy
• Incremental Memory LeakMedium
• Rotating the BoxMedium
• Sum of Floored PairsHard
• Sum of All Subset XOR TotalsEasy
• Minimum Number of Swaps to Make the Binary String AlternatingMedium
• Finding Pairs With a Certain SumMedium
• Number of Ways to Rearrange Sticks With K Sticks VisibleHard
• Orders With Maximum Quantity Above Average Medium
• Product of Two Run-Length Encoded Arrays Medium
• Longer Contiguous Segments of Ones than ZerosEasy
• Minimum Speed to Arrive on TimeMedium
• Jump Game VIIMedium
• Stone Game VIIIHard
• Calculate Special Bonus Easy
• Minimize Product Sum of Two ArraysMedium
• Group Employees of the Same Salary Medium
• Substrings of Size Three with Distinct CharactersEasy
• Minimize Maximum Pair Sum in ArrayMedium
• Get Biggest Three Rhombus Sums in a GridMedium
• Minimum XOR Sum of Two ArraysHard
• Check if Word Equals Summation of Two WordsEasy
• Maximum Value after InsertionMedium
• Process Tasks Using ServersMedium
• Minimum Skips to Arrive at Meeting On TimeHard
• Egg Drop With 2 Eggs and N FloorsMedium
• Count Pairs in Two ArraysMedium
• Determine Whether Matrix Can Be Obtained By RotationEasy
• Reduction Operations to Make the Array Elements EqualMedium
• Minimum Number of Flips to Make the Binary String AlternatingMedium
• Minimum Space Wasted From PackagingHard
• The Latest Login in 2020 Easy
• Cutting RibbonsMedium
• Page Recommendations II Hard
• Check if All the Integers in a Range Are CoveredEasy
• Find the Student that Will Replace the ChalkMedium
• Largest Magic SquareMedium
• Minimum Cost to Change the Final Value of ExpressionHard
• Redistribute Characters to Make All Strings EqualEasy
• Maximum Number of Removable CharactersMedium
• Merge Triplets to Form Target TripletMedium
• The Earliest and Latest Rounds Where Players CompeteHard
• Find a Peak Element II Medium
• Depth of BST Given Insertion OrderMedium
• Largest Odd Number in StringEasy
• The Number of Full Rounds You Have PlayedMedium
• Count Sub IslandsMedium
• Minimum Absolute Difference QueriesMedium
• Count Salary Categories Medium
• Game of NimMedium
• Remove One Element to Make the Array Strictly IncreasingEasy
• Remove All Occurrences of a SubstringMedium
• Maximum Alternating Subsequence SumMedium
• Design Movie Rental SystemHard
• Maximum Product Difference Between Two PairsEasy
• Cyclically Rotating a GridMedium
• Number of Wonderful SubstringsMedium
• Count Ways to Build Rooms in an Ant ColonyHard
• Leetcodify Friends Recommendations Hard
• Kth Smallest Subarray SumMedium
• Leetcodify Similar Friends Hard
• Build Array from PermutationEasy
• Eliminate Maximum Number of MonstersMedium
• Count Good NumbersMedium
• Longest Common SubpathHard
• Erect the Fence IIHard
• Count Square Sum TriplesEasy
• Nearest Exit from Entrance in MazeMedium
• Sum GameMedium
• Minimum Cost to Reach Destination in TimeHard
• Concatenation of ArrayEasy
• Unique Length-3 Palindromic SubsequencesMedium
• Painting a Grid With Three Different ColorsHard
• Merge BSTs to Create Single BSTHard
• Check if String Is Decomposable Into Value-Equal SubstringsEasy
• Confirmation Rate Medium
• Maximum Number of Words You Can TypeEasy
• Add Minimum Number of RungsMedium
• Maximum Number of Points with CostMedium
• Maximum Genetic Difference QueryHard
• Users That Actively Request Confirmation Messages Easy
• Longest Common Subsequence Between Sorted ArraysMedium
• Check if All Characters Have Equal Number of OccurrencesEasy
• The Number of the Smallest Unoccupied ChairMedium
• Describe the PaintingMedium
• Number of Visible People in a QueueHard
• Sum of Digits of String After ConvertEasy
• Largest Number After Mutating SubstringMedium
• Maximum Compatibility Score SumMedium
• Delete Duplicate Folders in SystemHard
• Strong Friendship Medium
• Maximum of Minimum Values in All SubarraysMedium
• All the Pairs With the Maximum Number of Common Followers Medium
• Three DivisorsEasy
• Maximum Number of Weeks for Which You Can WorkMedium
• Minimum Garden Perimeter to Collect Enough ApplesMedium
• Count Number of Special SubsequencesHard
• Minimum Time For K Virus Variants to SpreadHard
• Delete Characters to Make Fancy StringEasy
• Check if Move is LegalMedium
• Minimum Total Space Wasted With K Resizing OperationsMedium
• Maximum Product of the Length of Two Palindromic SubstringsHard
• Check If String Is a Prefix of ArrayEasy
• Remove Stones to Minimize the TotalMedium
• Minimum Number of Swaps to Make the String BalancedMedium
• Find the Longest Valid Obstacle Course at Each PositionHard
• Employees With Missing Information Easy
• Binary Searchable Numbers in an Unsorted ArrayMedium
• Number of Strings That Appear as Substrings in WordEasy
• Array With Elements Not Equal to Average of NeighborsMedium
• Minimum Non-Zero Product of the Array ElementsMedium
• Last Day Where You Can Still CrossHard
• Find if Path Exists in GraphEasy
• First and Last Call On the Same Day Hard
• Count Nodes Equal to Sum of DescendantsMedium
• Minimum Time to Type Word Using Special TypewriterEasy
• Maximum Matrix SumMedium
• Number of Ways to Arrive at DestinationMedium
• Number of Ways to Separate NumbersHard
• Employees Whose Manager Left the Company Easy
• Find Greatest Common Divisor of ArrayEasy
• Find Unique Binary StringMedium
• Minimize the Difference Between Target and Chosen ElementsMedium
• Find Array Given Subset SumsHard
• Widest Pair of Indices With Equal Range SumMedium
• Minimum Difference Between Highest and Lowest of K ScoresEasy
• Find the Kth Largest Integer in the ArrayMedium
• Minimum Number of Work Sessions to Finish the TasksMedium
• Number of Unique Good SubsequencesHard
• Find Cutoff Score for Each School Medium
• Maximum Number of People That Can Be Caught in TagMedium
• Count the Number of Experiments Medium
• Find the Middle Index in ArrayEasy
• Find All Groups of FarmlandMedium
• Operations on TreeMedium
• The Number of Good SubsetsHard
• Count Special QuadrupletsEasy
• The Number of Weak Characters in the GameMedium
• First Day Where You Have Been in All the RoomsMedium
• GCD Sort of an ArrayHard
• Smallest Greater Multiple Made of Two DigitsMedium
• Reverse Prefix of WordEasy
• Number of Pairs of Interchangeable RectanglesMedium
• Maximum Product of the Length of Two Palindromic SubsequencesMedium
• Smallest Missing Genetic Value in Each SubtreeHard
• The Number of Seniors and Juniors to Join the Company Hard
• Subtree Removal Game with Fibonacci TreeHard
• Count Number of Pairs With Absolute Difference KEasy
• Find Original Array From Doubled ArrayMedium
• Maximum Earnings From TaxiMedium
• Minimum Number of Operations to Make Array ContinuousHard
• The Number of Seniors and Juniors to Join the Company II Hard
• Final Value of Variable After Performing OperationsEasy
• Sum of Beauty in the ArrayMedium
• Detect SquaresMedium
• Longest Subsequence Repeated k TimesHard
• Average Height of Buildings in Each SegmentMedium
• Maximum Difference Between Increasing ElementsEasy
• Grid GameMedium
• Check if Word Can Be Placed In CrosswordMedium
• The Score of Students Solving Math ExpressionHard
• Number of Accounts That Did Not Stream Medium
• Brightest Position on StreetMedium
• Convert 1D Array Into 2D ArrayEasy
• Number of Pairs of Strings With Concatenation Equal to TargetMedium
• Maximize the Confusion of an ExamMedium
• Maximum Number of Ways to Partition an ArrayHard
• Low-Quality Problems Easy
• Minimum Moves to Convert StringEasy
• Find Missing ObservationsMedium
• Stone Game IXMedium
• Smallest K-Length Subsequence With Occurrences of a LetterHard
• Count Subarrays With More Ones Than ZerosMedium
• Two Out of ThreeEasy
• Minimum Operations to Make a Uni-Value GridMedium
• Stock Price Fluctuation Medium
• Partition Array Into Two Arrays to Minimize Sum DifferenceHard
• Maximum Alternating Subarray SumMedium
• Minimum Number of Moves to Seat EveryoneEasy
• Remove Colored Pieces if Both Neighbors are the Same ColorMedium
• The Time When the Network Becomes IdleMedium
• Kth Smallest Product of Two Sorted ArraysHard
• Accepted Candidates From the Interviews Medium
• Check if Numbers Are Ascending in a SentenceEasy
• Simple Bank SystemMedium
• Count Number of Maximum Bitwise-OR SubsetsMedium
• Second Minimum Time to Reach DestinationHard
• Sort Linked List Already Sorted Using Absolute ValuesMedium
• Number of Valid Words in a SentenceEasy
• Next Greater Numerically Balanced NumberMedium
• Count Nodes With the Highest ScoreMedium
• Parallel Courses IIIHard
• The Category of Each Member in the Store Medium
• Minimum Cost to Separate Sentence Into RowsMedium
• Kth Distinct String in an ArrayEasy
• Two Best Non-Overlapping EventsMedium
• Plates Between CandlesMedium
• Number of Valid Move Combinations On ChessboardHard
• Smallest Index With Equal ValueEasy
• Find the Minimum and Maximum Number of Nodes Between Critical PointsMedium
• Minimum Operations to Convert NumberMedium
• Check if an Original String Exists Given Two Encoded StringsHard
• Number of Spaces Cleaning Robot CleanedMedium
• Count Vowel Substrings of a StringEasy
• Vowels of All SubstringsMedium
• Minimized Maximum of Products Distributed to Any StoreMedium
• Maximum Path Quality of a GraphHard
• Account Balance Medium
• Number of Equal Count SubstringsMedium
• Check Whether Two Strings are Almost EquivalentEasy
• Walking Robot Simulation IIMedium
• Most Beautiful Item for Each QueryMedium
• Maximum Number of Tasks You Can AssignHard
• The Winner University Easy
• Time Needed to Buy TicketsEasy
• Reverse Nodes in Even Length GroupsMedium
• Decode the Slanted CiphertextMedium
• Process Restricted Friend RequestsHard
• Paths in Maze That Lead to Same RoomMedium
• Two Furthest Houses With Different ColorsEasy
• Watering PlantsMedium
• Range Frequency QueriesMedium
• Sum of k-Mirror NumbersHard
• The Number of Rich Customers Easy
• Substrings That Begin and End With the Same LetterMedium
• Drop Type 1 Orders for Customers With Type 0 Orders Medium
• Count Common Words With One OccurrenceEasy
• Minimum Number of Food Buckets to Feed the HamstersMedium
• Minimum Cost Homecoming of a Robot in a GridMedium
• Count Fertile Pyramids in a LandHard
• Find Target Indices After Sorting ArrayEasy
• K Radius Subarray AveragesMedium
• Removing Minimum and Maximum From ArrayMedium
• Find All People With SecretHard
• Minimum Cost to Reach City With DiscountsMedium
• Finding 3-Digit Even NumbersEasy
• Delete the Middle Node of a Linked ListMedium
• Step-By-Step Directions From a Binary Tree Node to AnotherMedium
• Valid Arrangement of PairsHard
• Subsequence of Size K With the Largest Even SumMedium
• Find Subsequence of Length K With the Largest SumEasy
• Find Good Days to Rob the BankMedium
• Detonate the Maximum Bombs Medium
• Sequentially Ordinal Rank TrackerHard
• Rings and RodsEasy
• Sum of Subarray RangesMedium
• Watering Plants IIMedium
• Maximum Fruits Harvested After at Most K StepsHard
• Number of Unique Flavors After Sharing K CandiesMedium
• Find First Palindromic String in the ArrayEasy
• Adding Spaces to a StringMedium
• Number of Smooth Descent Periods of a StockMedium
• Minimum Operations to Make the Array K-IncreasingHard
• The Airport With the Most Traffic Medium
• Elements in Array After Removing and Replacing ElementsMedium
• Maximum Number of Words Found in SentencesEasy
• Find All Possible Recipes from Given SuppliesMedium
• Check if a Parentheses String Can Be ValidMedium
• Abbreviating the Product of a RangeHard
• Build the Equation Hard
• A Number After a Double ReversalEasy
• Execution of All Suffix Instructions Staying in a GridMedium
• Intervals Between Identical ElementsMedium
• Recover the Original ArrayHard
• Minimum Operations to Remove Adjacent Ones in MatrixHard
• Check if All A's Appears Before All B'sEasy
• Number of Laser Beams in a BankMedium
• Destroying AsteroidsMedium
• Maximum Employees to Be Invited to a MeetingHard
• Remove All Ones With Row and Column FlipsMedium
• Capitalize the TitleEasy
• Maximum Twin Sum of a Linked ListMedium
• Longest Palindrome by Concatenating Two Letter WordsMedium
• Stamping the GridHard
• Check if Every Row and Column Contains All NumbersEasy
• Minimum Swaps to Group All 1's Together IIMedium
• Count Words Obtained After Adding a LetterMedium
• Earliest Possible Day of Full BloomHard
• Pour Water Between Buckets to Make Water Levels EqualMedium
• Divide a String Into Groups of Size kEasy
• Minimum Moves to Reach Target ScoreMedium
• Solving Questions With BrainpowerMedium
• Maximum Running Time of N ComputersHard
• The Number of Passengers in Each Bus I Medium
• Choose Numbers From Two Arrays in RangeHard
• Minimum Cost of Buying Candies With DiscountEasy
• Count the Hidden SequencesMedium
• K Highest Ranked Items Within a Price RangeMedium
• Number of Ways to Divide a Long CorridorHard
• Count Elements With Strictly Smaller and Greater Elements Easy
• Rearrange Array Elements by SignMedium
• Find All Lonely Numbers in the ArrayMedium
• Maximum Good People Based on StatementsHard
• Minimum Number of Lines to Cover PointsMedium
• The Number of Passengers in Each Bus II Hard
• Keep Multiplying Found Values by TwoEasy
• All Divisions With the Highest Score of a Binary ArrayMedium
• Find Substring With Given Hash ValueHard
• Groups of StringsHard
• Amount of New Area Painted Each DayHard
• Order Two Columns Independently Medium
• Minimum Sum of Four Digit Number After Splitting DigitsEasy
• Partition Array According to Given PivotMedium
• Minimum Cost to Set Cooking TimeMedium
• Minimum Difference in Sums After Removal of ElementsHard
• Sort Even and Odd Indices IndependentlyEasy
• Smallest Value of the Rearranged NumberMedium
• Design BitsetMedium
• Minimum Time to Remove All Cars Containing Illegal GoodsHard
• Unique Substrings With Equal Digit FrequencyMedium
• Count Operations to Obtain ZeroEasy
• Minimum Operations to Make the Array AlternatingMedium
• Removing Minimum Number of Magic BeansMedium
• Maximum AND Sum of ArrayHard
• Longest Winning Streak Hard
• Remove All Ones With Row and Column Flips IIMedium
• The Change in Global Rankings Medium
• Count Equal and Divisible Pairs in an ArrayEasy
• Find Three Consecutive Integers That Sum to a Given NumberMedium
• Maximum Split of Positive Even IntegersMedium
• Count Good Triplets in an ArrayHard
• Count Integers With Even Digit SumEasy
• Merge Nodes in Between ZerosMedium
• Construct String With Repeat LimitMedium
• Count Array Pairs Divisible by KHard
• Number of Ways to Build Sturdy Brick WallMedium
• Counting Words With a Given PrefixEasy
• Minimum Number of Steps to Make Two Strings Anagram IIMedium
• Minimum Time to Complete TripsMedium
• Minimum Time to Finish the RaceHard
• Number of Ways to Build House of CardsMedium
• Most Frequent Number Following Key In an ArrayEasy
• Sort the Jumbled NumbersMedium
• All Ancestors of a Node in a Directed Acyclic GraphMedium
• Minimum Number of Moves to Make PalindromeHard
• Cells in a Range on an Excel SheetEasy
• Append K Integers With Minimal SumMedium
• Create Binary Tree From DescriptionsMedium
• Replace Non-Coprime Numbers in ArrayHard
• Number of Single Divisor TripletsMedium
• Finding the Topic of Each Post Hard
• Find All K-Distant Indices in an ArrayEasy
• Count Artifacts That Can Be ExtractedMedium
• Maximize the Topmost Element After K MovesMedium
• Minimum Weighted Subgraph With the Required PathsHard
• Distance to a Cycle in Undirected GraphHard
• The Number of Users That Are Eligible for Discount Easy
• Divide Array Into Equal PairsEasy
• Maximize Number of Subsequences in a StringMedium
• Minimum Operations to Halve Array SumMedium
• Minimum White Tiles After Covering With CarpetsHard
• Count Hills and Valleys in an ArrayEasy
• Count Collisions on a RoadMedium
• Maximum Points in an Archery CompetitionMedium
• Longest Substring of One Repeating CharacterHard
• Minimum Health to Beat GameMedium
• Find the Difference of Two ArraysEasy
• Minimum Deletions to Make Array BeautifulMedium
• Find Palindrome With Fixed LengthMedium
• Maximum Value of K Coins From PilesHard
• Maximum Sum Score of ArrayMedium
• Minimum Bit Flips to Convert NumberEasy
• Find Triangular Sum of an ArrayMedium
• Number of Ways to Select BuildingsMedium
• Sum of Scores of Built StringsHard
• Minimum Number of Operations to Convert TimeEasy
• Find Players With Zero or One LossesMedium
• Maximum Candies Allocated to K ChildrenMedium
• Encrypt and Decrypt StringsHard
• Users With Two Purchases Within Seven Days Medium
• Check if an Array Is ConsecutiveEasy
• The Users That Are Eligible for Discount Easy
• Largest Number After Digit Swaps by ParityEasy
• Minimize Result by Adding Parentheses to ExpressionMedium
• Maximum Product After K IncrementsMedium
• Maximum Total Beauty of the GardensHard
• Add Two Integers Easy
• Root Equals Sum of ChildrenEasy
• Count Positions on Street With Required BrightnessMedium
• Number of Times a Driver Was a Passenger Medium
• Find Closest Number to ZeroEasy
• Number of Ways to Buy Pens and PencilsMedium
• Design an ATM MachineMedium
• Maximum Score of a Node SequenceHard
• Calculate Digit Sum of a StringEasy
• Minimum Rounds to Complete All TasksMedium
• Maximum Trailing Zeros in a Cornered PathMedium
• Longest Path With Different Adjacent CharactersHard
• Maximum Cost of Trip With K HighwaysHard
• Intersection of Multiple ArraysEasy
• Count Lattice Points Inside a CircleMedium
• Count Number of Rectangles Containing Each PointMedium
• Number of Flowers in Full BloomHard
• Dynamic Pivoting of a Table Hard
• Dynamic Unpivoting of a Table Hard
• Design Video Sharing PlatformHard
• Count Prefixes of a Given StringEasy
• Minimum Average DifferenceMedium
• Count Unguarded Cells in the GridMedium
• Escape the Spreading FireHard
• Remove Digit From Number to Maximize ResultEasy
• Minimum Consecutive Cards to Pick UpMedium
• K Divisible Elements SubarraysMedium
• Total Appeal of A StringHard
• Make Array Non-decreasing or Non-increasingHard
• Largest 3-Same-Digit Number in StringEasy
• Count Nodes Equal to Average of SubtreeMedium
• Count Number of TextsMedium
• Check if There Is a Valid Parentheses String PathHard
• Minimum Number of KeypressesMedium
• Find the K-Beauty of a NumberEasy
• Number of Ways to Split ArrayMedium
• Maximum White Tiles Covered by a CarpetMedium
• Substring With Largest VarianceHard
• Find Resultant Array After Removing AnagramsEasy
• Maximum Consecutive Floors Without Special FloorsMedium
• Largest Combination With Bitwise AND Greater Than ZeroMedium
• Count Integers in IntervalsHard
• Closest Node to Path in TreeHard
• Percentage of Letter in StringEasy
• Maximum Bags With Full Capacity of RocksMedium
• Minimum Lines to Represent a Line ChartMedium
• Sum of Total Strength of WizardsHard
• Number of People That Can Be Seen in a GridMedium
• Check if Number Has Equal Digit Count and Digit Value Easy
• Sender With Largest Word CountMedium
• Maximum Total Importance of RoadsMedium
• Booking Concert Tickets in GroupsHard
• Rearrange Characters to Make Target StringEasy
• Apply Discount to PricesMedium
• Steps to Make Array Non-decreasingMedium
• Minimum Obstacle Removal to Reach CornerHard
• Maximum Profit From Trading StocksMedium
• Products With Three or More Orders in Two Consecutive Years Medium
• Min Max GameEasy
• Partition Array Such That Maximum Difference Is KMedium
• Replace Elements in an ArrayMedium
• Design a Text EditorHard
• Jump Game VIIIMedium
• Tasks Count in the Weekend Medium
• Strong Password Checker IIEasy
• Successful Pairs of Spells and PotionsMedium
• Match Substring After ReplacementHard
• Count Subarrays With Score Less Than KHard
• Calculate Amount Paid in TaxesEasy
• Minimum Path Cost in a GridMedium
• Fair Distribution of CookiesMedium
• Naming a CompanyHard
• Check for Contradictions in EquationsHard
• Arrange Table by Gender Medium
• Greatest English Letter in Upper and Lower CaseEasy
• Sum of Numbers With Units Digit KMedium
• Longest Binary Subsequence Less Than or Equal to KMedium
• Selling Pieces of WoodHard
• Minimum Flips in Binary Tree to Get ResultHard
• The First Day of the Maximum Recorded Degree in Each City Medium
• Count AsterisksEasy
• Count Unreachable Pairs of Nodes in an Undirected GraphMedium
• Maximum XOR After Operations Medium
• Number of Distinct Roll SequencesHard
• Check if Matrix Is X-MatrixEasy
• Count Number of Ways to Place HousesMedium
• Maximum Score Of Spliced ArrayHard
• Minimum Score After Removals on a TreeHard
• Find Minimum Time to Finish All Jobs IIMedium
• Product Sales Analysis IV Medium
• Decode the MessageEasy
• Spiral Matrix IVMedium
• Number of People Aware of a SecretMedium
• Number of Increasing Paths in a GridHard
• Product Sales Analysis V Easy
• Valid Palindrome IVMedium
• Evaluate Boolean Binary TreeEasy
• The Latest Time to Catch a Bus Medium
• Minimum Sum of Squared DifferenceMedium
• Subarray With Elements Greater Than Varying ThresholdHard
• Minimum Amount of Time to Fill CupsEasy
• Smallest Number in Infinite SetMedium
• Move Pieces to Obtain a StringMedium
• Count the Number of Ideal ArraysHard
• All the Matches of the League Easy
• Minimum Adjacent Swaps to Make a Valid ArrayMedium
• Maximum Number of Pairs in ArrayEasy
• Max Sum of a Pair With Equal Sum of DigitsMedium
• Query Kth Smallest Trimmed NumberMedium
• Minimum Deletions to Make Array DivisibleHard
• Finding the Number of Visible MountainsMedium
• Compute the Rank as a Percentage Medium
• Best Poker HandEasy
• Number of Zero-Filled SubarraysMedium
• Design a Number Container SystemMedium
• Shortest Impossible Sequence of RollsHard
• First Letter to Appear TwiceEasy
• Equal Row and Column PairsMedium
• Design a Food Rating SystemMedium
• Number of Excellent PairsHard
• Maximum Number of Books You Can TakeHard
• Number of Unique Subjects Taught by Each Teacher Easy
• Make Array Zero by Subtracting Equal AmountsEasy
• Maximum Number of Groups Entering a CompetitionMedium
• Find Closest Node to Given Two NodesMedium
• Longest Cycle in a GraphHard
• Minimum Costs Using the Train LineHard
• Generate the Invoice Hard
• Merge Similar ItemsEasy
• Count Number of Bad PairsMedium
• Task Scheduler II Medium
• Minimum Replacements to Sort the ArrayHard
• Number of Arithmetic TripletsEasy
• Reachable Nodes With RestrictionsMedium
• Check if There is a Valid Partition For The ArrayMedium
• Longest Ideal SubsequenceMedium
• Minimize Maximum Value in a GridHard
• Calculate the Influence of Each Salesperson Medium
• Largest Local Values in a MatrixEasy
• Node With Highest Edge ScoreMedium
• Construct Smallest Number From DI StringMedium
• Count Special IntegersHard
• Sort the Olympic Table Easy
• Choose Edges to Maximize Score in a TreeMedium
• Minimum Recolors to Get K Consecutive Black BlocksEasy
• Time Needed to Rearrange a Binary StringMedium
• Shifting Letters IIMedium
• Maximum Segment Sum After RemovalsHard
• Minimum Hours of Training to Win a CompetitionEasy
• Largest Palindromic NumberMedium
• Amount of Time for Binary Tree to Be InfectedMedium
• Find the K-Sum of an ArrayHard
• Median of a Row Wise Sorted MatrixMedium
• Change Null Values in a Table to the Previous Value Medium
• Longest Subsequence With Limited SumEasy
• Removing Stars From a StringMedium
• Minimum Amount of Time to Collect GarbageMedium
• Build a Matrix With ConditionsHard
• Count Strictly Increasing SubarraysMedium
• Employees With Deductions Medium
• Find Subarrays With Equal SumEasy
• Strictly Palindromic NumberMedium
• Maximum Rows Covered by ColumnsMedium
• Maximum Number of Robots Within BudgetHard
• Check Distances Between Same LettersEasy
• Number of Ways to Reach a Position After Exactly k StepsMedium
• Longest Nice SubarrayMedium
• Meeting Rooms III Hard
• Minimum Time to Kill All MonstersHard
• Most Frequent Even ElementEasy
• Optimal Partition of StringMedium
• Divide Intervals Into Minimum Number of GroupsMedium
• Longest Increasing Subsequence IIHard
• Design SQLMedium
• Count Days Spent TogetherEasy
• Maximum Matching of Players With TrainersMedium
• Smallest Subarrays With Maximum Bitwise ORMedium
• Minimum Money Required Before TransactionsHard
• Smallest Even MultipleEasy
• Length of the Longest Alphabetical Continuous SubstringMedium
• Reverse Odd Levels of Binary TreeMedium
• Sum of Prefix Scores of StringsHard
• Closest Fair IntegerMedium
• Sort the PeopleEasy
• Longest Subarray With Maximum Bitwise ANDMedium
• Find All Good IndicesMedium
• Number of Good PathsHard
• Merge Operations to Turn Array Into a PalindromeMedium
• Remove Letter To Equalize FrequencyEasy
• Longest Uploaded PrefixMedium
• Bitwise XOR of All PairingsMedium
• Number of Pairs Satisfying InequalityHard
• Number of Common FactorsEasy
• Maximum Sum of an HourglassMedium
• Minimize XORMedium
• Maximum Deletions on a StringHard
• Maximize Total Tastiness of Purchased FruitsMedium
• The Employee That Worked on the Longest TaskEasy
• Find The Original Array of Prefix XorMedium
• Using a Robot to Print the Lexicographically Smallest StringMedium
• Paths in Matrix Whose Sum Is Divisible by KHard
• Minimum Split Into Subarrays With GCD Greater Than OneMedium
• Number of Valid Clock TimesEasy
• Range Product Queries of PowersMedium
• Minimize Maximum of ArrayMedium
• Create Components With Same ValueHard
• Largest Positive Integer That Exists With Its NegativeEasy
• Count Number of Distinct Integers After Reverse OperationsMedium
• Sum of Number and Its ReverseMedium
• Count Subarrays With Fixed BoundsHard
• Number of Nodes With Value OneMedium
• Determine if Two Events Have ConflictEasy
• Number of Subarrays With GCD Equal to KMedium
• Minimum Cost to Make Array EqualHard
• Minimum Number of Operations to Make Arrays SimilarHard
• Number of Distinct Binary Strings After Applying OperationsMedium
• Odd String DifferenceEasy
• Words Within Two Edits of DictionaryMedium
• Destroy Sequential TargetsMedium
• Next Greater Element IVHard
• Average Value of Even Numbers That Are Divisible by ThreeEasy
• Most Popular Video CreatorMedium
• Minimum Addition to Make Integer BeautifulMedium
• Height of Binary Tree After Subtree Removal Queries Hard
• Sort Array by Moving Items to Empty SpaceHard
• Apply Operations to an ArrayEasy
• Maximum Sum of Distinct Subarrays With Length KMedium
• Total Cost to Hire K WorkersMedium
• Minimum Total Distance TraveledHard
• Minimum Subarrays in a Valid SplitMedium
• Number of Distinct AveragesEasy
• Count Ways To Build Good StringsMedium
• Most Profitable Path in a TreeMedium
• Split Message Based on LimitHard
• Convert the TemperatureEasy
• Number of Subarrays With LCM Equal to KMedium
• Minimum Number of Operations to Sort a Binary Tree by LevelMedium
• Maximum Number of Non-overlapping Palindrome SubstringsHard
• Minimum Cost to Buy ApplesMedium
• Customers With Strictly Increasing PurchasesHard
• Number of Unequal Triplets in ArrayEasy
• Closest Nodes Queries in a Binary Search TreeMedium
• Minimum Fuel Cost to Report to the CapitalMedium
• Number of Beautiful PartitionsHard
• Maximum XOR of Two Non-Overlapping SubtreesHard
• Form a Chemical BondEasy
• Minimum Cuts to Divide a CircleEasy
• Difference Between Ones and Zeros in Row and ColumnMedium
• Minimum Penalty for a ShopMedium
• Count Palindromic SubsequencesHard
• Find the Pivot IntegerEasy
• Append Characters to String to Make SubsequenceMedium
• Remove Nodes From Linked ListMedium
• Count Subarrays With Median KHard
• Number of Substrings With Fixed RatioMedium
• Circular SentenceEasy
• Divide Players Into Teams of Equal SkillMedium
• Minimum Score of a Path Between Two CitiesMedium
• Divide Nodes Into the Maximum Number of GroupsHard
• Merge Overlapping Events in the Same HallHard
• Number of Subarrays Having Even ProductMedium
• Maximum Value of a String in an ArrayEasy
• Maximum Star Sum of a GraphMedium
• Frog Jump IIMedium
• Minimum Total Cost to Make Arrays UnequalHard
• Delete Greatest Value in Each RowEasy
• Longest Square Streak in an ArrayMedium
• Design Memory AllocatorMedium
• Maximum Number of Points From Grid QueriesHard
• Concatenate the Name and the ProfessionEasy
• Bitwise OR of All Subsequence SumsMedium
• Count Pairs Of Similar StringsEasy
• Smallest Value After Replacing With Sum of Prime FactorsMedium
• Add Edges to Make Degrees of All Nodes EvenHard
• Cycle Length Queries in a TreeHard
• Check if There is a Path With Equal Number of 0's And 1'sMedium
• Maximum Enemy Forts That Can Be CapturedEasy
• Reward Top K StudentsMedium
• Minimize the Maximum of Two ArraysMedium
• Count AnagramsHard
• Shortest Distance to Target String in a Circular ArrayEasy
• Take K of Each Character From Left and RightMedium
• Maximum Tastiness of Candy BasketMedium
• Number of Great PartitionsHard
• Count the Number of K-Big IndicesHard
• Count the Digits That Divide a NumberEasy
• Distinct Prime Factors of Product of ArrayMedium
• Partition String Into Substrings With Values at Most KMedium
• Closest Prime Numbers in RangeMedium
• Maximum Frequency Score of a SubarrayHard
• Categorize Box According to CriteriaEasy
• Find Consecutive Integers from a Data StreamMedium
• Find Xor-Beauty of ArrayMedium
• Maximize the Minimum Powered CityHard
• Maximum Count of Positive Integer and Negative IntegerEasy
• Maximal Score After Applying K OperationsMedium
• Make Number of Distinct Characters EqualMedium
• Time to Cross a BridgeHard
• Number of Good Binary StringsMedium
• Time Taken to Cross the DoorHard
• Difference Between Element Sum and Digit Sum of an ArrayEasy
• Increment Submatrices by OneMedium
• Count the Number of Good SubarraysMedium
• Difference Between Maximum and Minimum Price SumHard
• Count the Number of Good SubsequencesMedium
• Minimum Common ValueEasy
• Minimum Operations to Make Array Equal IIMedium
• Maximum Subsequence ScoreMedium
• Check if Point Is ReachableHard
• Alternating Digit SumEasy
• Sort the Students by Their Kth ScoreMedium
• Apply Bitwise Operations to Make Strings EqualMedium
• Minimum Cost to Split an ArrayHard
• Maximum Price to Fill a BagMedium
• Count Distinct Numbers on BoardEasy
• Count Collisions of Monkeys on a PolygonMedium
• Put Marbles in BagsHard
• Count Increasing QuadrupletsHard
• Separate the Digits in an ArrayEasy
• Maximum Number of Integers to Choose From a Range IMedium
• Maximize Win From Two SegmentsMedium
• Disconnect Path in a Binary Matrix by at Most One FlipMedium
• Maximum Number of Integers to Choose From a Range IIMedium
• Take Gifts From the Richest PileEasy
• Count Vowel Strings in RangesMedium
• House Robber IVMedium
• Rearranging FruitsHard
• Find the Array Concatenation ValueEasy
• Count the Number of Fair PairsMedium
• Substring XOR QueriesMedium
• Subsequence With the Minimum ScoreHard
• Maximum Difference by Remapping a DigitEasy
• Minimum Score by Changing Two ElementsMedium
• Minimum Impossible ORMedium
• Handling Sum Queries After UpdateHard
• Merge Two 2D Arrays by Summing ValuesEasy
• Minimum Operations to Reduce an Integer to 0Medium
• Count the Number of Square-Free SubsetsMedium
• Find the String with LCPHard
• Left and Right Sum DifferencesEasy
• Find the Divisibility Array of a StringMedium
• Find the Maximum Number of Marked IndicesMedium
• Minimum Time to Visit a Cell In a GridHard
• Split With Minimum SumEasy
• Count Total Number of Colored CellsMedium
• Count Ways to Group Overlapping RangesMedium
• Count Number of Possible Root NodesHard
• Pass the PillowEasy
• Kth Largest Sum in a Binary TreeMedium
• Split the Array to Make Coprime ProductsHard
• Number of Ways to Earn PointsHard
• Count the Number of Vowel Strings in RangeEasy
• Rearrange Array to Maximize Prefix ScoreMedium
• Count the Number of Beautiful SubarraysMedium
• Minimum Time to Complete All TasksHard
• Design a Todo ListMedium
• Distribute Money to Maximum ChildrenEasy
• Maximize Greatness of an ArrayMedium
• Find Score of an Array After Marking All ElementsMedium
• Minimum Time to Repair CarsMedium
• Number of Even and Odd BitsEasy
• Check Knight Tour ConfigurationMedium
• The Number of Beautiful SubsetsMedium
• Smallest Missing Non-negative Integer After OperationsMedium
• Make the Prefix Sum Non-negativeMedium
• K Items With the Maximum SumEasy
• Prime Subtraction OperationMedium
• Minimum Operations to Make All Array Elements EqualMedium
• Collect Coins in a TreeHard
• Minimum Time to Eat All GrainsHard
• Form Smallest Number From Two Digit ArraysEasy
• Find the Substring With Maximum CostMedium
• Make K-Subarray Sums EqualMedium
• Shortest Cycle in a GraphHard
• Find the Longest Balanced Substring of a Binary StringEasy
• Convert an Array Into a 2D Array With ConditionsMedium
• Mice and CheeseMedium
• Minimum Reverse OperationsHard
• Beautiful PairsHard
• Prime In DiagonalEasy
• Sum of DistancesMedium
• Minimize the Maximum Difference of PairsMedium
• Minimum Number of Visited Cells in a GridHard
• Check if Object Instance of ClassMedium
• Array Prototype LastEasy
• CounterEasy
• SleepEasy
• Cache With Time LimitMedium
• MemoizeMedium
• Snail TraversalMedium
• Flatten Deeply Nested ArrayMedium
• Array Reduce TransformationEasy
• DebounceMedium
• JSON Deep EqualMedium
• Function CompositionEasy
• Memoize IIHard
• Group ByMedium
• CurryMedium
• Convert Object to JSON StringMedium
• Filter Elements from ArrayEasy
• Apply Transform Over Each Element in ArrayEasy
• Promise PoolMedium
• Promise Time LimitMedium
• Count the Number of K-Free SubsetsMedium
• Find the Width of Columns of a GridEasy
• Find the Score of All Prefixes of an ArrayMedium
• Cousins in Binary Tree IIMedium
• Design Graph With Shortest Path CalculatorHard
• Row With Maximum OnesEasy
• Find the Maximum Divisibility ScoreEasy
• Minimum Additions to Make Valid StringMedium
• Minimize the Total Price of the TripsHard
• Color the Triangle RedHard
• Generate Fibonacci SequenceEasy
• Nested Array GeneratorMedium
• Design Cancellable FunctionHard
• Calculate Delayed Arrival TimeEasy
• Sum MultiplesEasy
• Sliding Subarray BeautyMedium
• Minimum Number of Operations to Make All Array Elements Equal to 1Medium
• Find Maximal Uncovered RangesMedium
• Maximum Sum With Exactly K Elements Easy
• Find the Prefix Common Array of Two ArraysMedium
• Maximum Number of Fish in a GridMedium
• Make Array EmptyHard
• Determine the Winner of a Bowling GameEasy
• First Completely Painted Row or ColumnMedium
• Minimum Cost of a Path With Special RoadsMedium
• Lexicographically Smallest Beautiful StringHard
• The Knight’s TourMedium
• Counter IIEasy
• Allow One Function CallEasy
• Create Hello World FunctionEasy
• Find Latest SalariesEasy
• Count Artist Occurrences On Spotify Ranking ListEasy
• Find the Distinct Difference ArrayEasy
• Frequency TrackerMedium
• Number of Adjacent Elements With the Same ColorMedium
• Make Costs of Paths Equal in a Binary TreeMedium
• Split a Circular Linked ListMedium
• Array of Objects to MatrixHard
• ThrottleMedium
• Chunk ArrayEasy
• Number of Senior CitizensEasy
• Sum in a MatrixMedium
• Maximum ORMedium
• Power of HeroesHard
• Find the Losers of the Circular GameEasy
• Neighboring Bitwise XORMedium
• Maximum Number of Moves in a GridMedium
• Count the Number of Complete ComponentsMedium
• Immediate Food Delivery IIIMedium
• Bikes Last Time Used Easy
• Find Active UsersMedium
• Extract Kth Character From The Rope TreeEasy
• Infinite Method ObjectEasy
• Immutability HelperHard
• Make Object ImmutableMedium
• Call Function with Custom ContextMedium
• Event EmitterMedium
• Array WrapperEasy
• Minimum String Length After Removing SubstringsEasy
• Lexicographically Smallest PalindromeEasy
• Find the Punishment Number of an IntegerMedium
• Modify Graph Edge WeightsHard
• Differences Between Two ObjectsMedium
• Consecutive Transactions with Increasing AmountsHard
• Minimum Operations to Make Numbers Non-positiveHard
• Return Length of Arguments PassedEasy
• To Be Or Not To BeEasy
• Compact ObjectMedium
• Buy Two ChocolatesEasy
• Extra Characters in a StringMedium
• Maximum Strength of a GroupMedium
• Greatest Common Divisor TraversalHard
• Remove Trailing Zeros From a StringEasy
• Difference of Number of Distinct Values on DiagonalsMedium
• Minimum Cost to Make All Characters EqualMedium
• Maximum Strictly Increasing Cells in a MatrixHard
• Find Shortest Path with K HopsHard
• Timeout CancellationEasy
• Minimize String LengthEasy
• Semi-Ordered PermutationEasy
• Sum of Matrix After QueriesMedium
• Count of IntegersHard
• Popularity PercentageHard
• Execute Asynchronous Functions in ParallelMedium
• Join Two Arrays by IDMedium
• Add Two PromisesEasy
• Sort ByEasy
• Interval CancellationEasy
• Calculator with Method ChainingEasy
• Is Object EmptyEasy
• Count Houses in a Circular StreetEasy
• Check if The Number is FascinatingEasy
• Find the Longest Semi-Repetitive SubstringMedium
• Movement of RobotsMedium
• Find a Good Subset of the MatrixHard
• Neither Minimum nor MaximumEasy
• Lexicographically Smallest String After Substring OperationMedium
• Collecting ChocolatesMedium
• Maximum Sum QueriesHard
• Find the Closest Marked NodeMedium
• Count Occurrences in TextMedium
• Total Distance TraveledEasy
• Find the Value of the PartitionMedium
• Special PermutationsMedium
• Painting the WallsHard
• Count Substrings Without Repeating CharacterMedium
• Find Maximum Number of String PairsEasy
• Construct the Longest New StringMedium
• Decremental String ConcatenationMedium
• Count Zero Request ServersMedium
• Number of Beautiful PairsEasy
• Minimum Operations to Make the Integer ZeroMedium
• Ways to Split Array Into Good SubarraysMedium
• Robot CollisionsHard
• Customers with Maximum Number of Transactions on Consecutive DaysHard
• Count Houses in a Circular Street IIHard
• Bind Function to ContextMedium
• Deep Merge of Two ObjectsMedium
• Query BatchingHard
• Generate Circular Array ValuesMedium
• Next DayEasy
• Convert JSON String to ObjectHard
• Longest Even Odd Subarray With ThresholdEasy
• Prime Pairs With Target SumMedium
• Continuous SubarraysMedium
• Sum of Imbalance Numbers of All SubarraysHard
• Is Array a Preorder of Some ‌Binary TreeMedium
• Longest Alternating SubarrayEasy
• Relocate MarblesMedium
• Partition String Into Minimum Beautiful SubstringsMedium
• Number of Black BlocksMedium
• Find the Maximum Achievable NumberEasy
• Maximum Number of Jumps to Reach the Last IndexMedium
• Longest Non-decreasing Subarray From Two ArraysMedium
• Apply Operations to Make All Array Elements Equal to ZeroMedium
• Height of Special Binary TreeMedium
• Array Upper BoundEasy
• Undefined to NullMedium
• Convert Callback Based Function to Promise Based FunctionMedium
• Date Range GeneratorMedium
• Sum of Squares of Special Elements Easy
• Maximum Beauty of an Array After Applying OperationMedium
• Minimum Index of a Valid SplitMedium
• Length of the Longest Valid SubstringHard
• Number of Unique CategoriesMedium
• Flight Occupancy and Waitlist AnalysisMedium
• Check if Array is GoodEasy
• Sort Vowels in a StringMedium
• Visit Array Positions to Maximize ScoreMedium
• Ways to Express an Integer as Sum of PowersMedium
• Split Strings by SeparatorEasy
• Largest Element in an Array after Merge OperationsMedium
• Maximum Number of Groups With Increasing LengthHard
• Count Paths That Can Form a Palindrome in a TreeHard
• Count Nodes That Are Great EnoughHard
• Status of Flight TicketsHard
• Create Object from Two ArraysEasy
• Parallel Execution of Promises for Individual Results RetrievalMedium
• Repeat StringEasy
• Partial Function with PlaceholdersEasy
• Number of Employees Who Met the TargetEasy
• Count Complete Subarrays in an ArrayMedium
• Shortest String That Contains Three StringsMedium
• Count Stepping Numbers in RangeHard
• Find The K-th Lucky NumberMedium
• Factorial GeneratorEasy
• Array Prototype ForEachEasy
• Custom IntervalMedium
• Account Balance After Rounded PurchaseEasy
• Insert Greatest Common Divisors in Linked ListMedium
• Minimum Seconds to Equalize a Circular ArrayMedium
• Minimum Time to Make Array Sum At Most xHard
• Faulty KeyboardEasy
• Check if it is Possible to Split ArrayMedium
• Find the Safest Path in a GridMedium
• Maximum Elegance of a K-Length SubsequenceHard
• Minimum Time Takes to Reach Destination Without DrowningHard
• Max Pair Sum in an ArrayEasy
• Double a Number Represented as a Linked ListMedium
• Minimum Absolute Difference Between Elements With ConstraintMedium
• Apply Operations to Maximize ScoreHard
• Minimum Relative Loss After Buying ChocolatesHard
• Election ResultsMedium
• Delay the Resolution of Each PromiseEasy
• Inversion of ObjectEasy
• Deep Object FilterMedium
• Count Pairs Whose Sum is Less than TargetEasy
• Make String a Subsequence Using Cyclic IncrementsMedium
• Sorting Three GroupsMedium
• Number of Beautiful Integers in the RangeHard
• Check if a String Is an Acronym of WordsEasy
• Determine the Minimum Sum of a k-avoiding ArrayMedium
• Maximize the Profit as the SalesmanMedium
• Find the Longest Equal SubarrayMedium
• Maximal Range That Each Element Is Maximum in ItMedium
• Furthest Point From OriginEasy
• Find the Minimum Possible Sum of a Beautiful ArrayMedium
• Minimum Operations to Form Subsequence With Target SumHard
• Maximize Value of Function in a Ball Passing GameHard
• Total Traveled DistanceEasy
• Maximum Coins Heroes Can CollectMedium
• Check if Strings Can be Made Equal With Operations IEasy
• Check if Strings Can be Made Equal With Operations IIMedium
• Maximum Sum of Almost Unique SubarrayMedium
• Count K-Subsequences of a String With Maximum BeautyHard
• Count Symmetric IntegersEasy
• Minimum Operations to Make a Special NumberMedium
• Count of Interesting SubarraysMedium
• Minimum Edge Weight Equilibrium Queries in a TreeHard
• Smallest Number With Given Digit ProductMedium
• Points That Intersect With CarsEasy
• Determine if a Cell Is Reachable at a Given TimeMedium
• Minimum Moves to Spread Stones Over GridMedium
• String TransformationHard
• Sum of Remoteness of All CellsMedium
• Highest Salaries DifferenceEasy
• Rolling Average StepsMedium
• Minimum Right Shifts to Sort the ArrayEasy
• Minimum Array Length After Pair RemovalsMedium
• Count Pairs of Points With Distance kMedium
• Minimum Edge Reversals So Every Node Is ReachableHard
• Sum of Values at Indices With K Set BitsEasy
• Happy StudentsMedium
• Maximum Number of AlloysMedium
• Maximum Element-Sum of a Complete Subset of IndicesHard
• Maximum Length of Semi-Decreasing SubarraysMedium
• Maximum Odd Binary NumberEasy
• Beautiful Towers IMedium
• Beautiful Towers IIMedium
• Count Valid Paths in a TreeHard
• The Wording GameHard
• Minimum Operations to Collect ElementsEasy
• Minimum Number of Operations to Make Array EmptyMedium
• Split Array Into Maximum Number of SubarraysMedium
• Maximum Number of K-Divisible ComponentsHard
• Maximum Value of an Ordered Triplet IEasy
• Maximum Value of an Ordered Triplet IIMedium
• Minimum Size Subarray in Infinite ArrayMedium
• Count Visited Nodes in a Directed GraphHard
• Create a DataFrame from ListEasy
• Get the Size of a DataFrameEasy
• Display the First Three RowsEasy
• Select DataEasy
• Create a New ColumnEasy
• Drop Duplicate RowsEasy
• Drop Missing DataEasy
• Modify ColumnsEasy
• Rename ColumnsEasy
• Change Data TypeEasy
• Fill Missing DataEasy
• Reshape Data: ConcatenateEasy
• Reshape Data: PivotEasy
• Reshape Data: MeltEasy
• Method ChainingEasy
• Minimizing Array After Replacing Pairs With Their ProductMedium
• Calculate Orders Within Each IntervalMedium
• Divisible and Non-divisible Sums DifferenceEasy
• Minimum Processing TimeMedium
• Apply Operations to Make Two Strings EqualMedium
• Apply Operations on Array to Maximize Sum of SquaresHard
• Maximum Linear Stock ScoreMedium
• Last Visited IntegersEasy
• Longest Unequal Adjacent Groups Subsequence IEasy
• Longest Unequal Adjacent Groups Subsequence IIMedium
• Count of Sub-Multisets With Bounded SumHard
• Find Indices With Index and Value Difference IEasy
• Shortest and Lexicographically Smallest Beautiful StringMedium
• Find Indices With Index and Value Difference IIMedium
• Construct Product MatrixMedium
• Maximum Profitable Triplets With Increasing Prices IMedium
• Minimum Sum of Mountain Triplets IEasy
• Minimum Sum of Mountain Triplets IIMedium
• Minimum Number of Groups to Create a Valid AssignmentMedium
• Minimum Changes to Make K Semi-palindromesHard
• Number of Ways to Reach Destination in the GridHard
• Subarrays Distinct Element Sum of Squares IEasy
• Minimum Number of Changes to Make Binary String BeautifulMedium
• Length of the Longest Subsequence That Sums to TargetMedium
• Subarrays Distinct Element Sum of Squares IIHard
• Find the K-or of an ArrayEasy
• Minimum Equal Sum of Two Arrays After Replacing ZerosMedium
• Minimum Increment Operations to Make Array BeautifulMedium
• Maximum Points After Collecting Coins From All NodesHard
• Maximum Profitable Triplets With Increasing Prices IIHard
• Market Analysis IIIMedium
• Find Champion IEasy
• Find Champion IIMedium
• Maximum Score After Applying Operations on a TreeMedium
• Maximum Balanced Subsequence SumHard
• Distribute Candies Among Children IIIHard
• Distribute Candies Among Children IEasy
• Distribute Candies Among Children IIMedium
• Number of Strings Which Can Be Rearranged to Contain SubstringMedium
• Maximum Spending After Buying ItemsHard
• Maximum Strong Pair XOR IEasy
• High-Access EmployeesMedium
• Minimum Operations to Maximize Last Elements in ArraysMedium
• Maximum Strong Pair XOR IIHard
• Number of Equal Numbers BlocksMedium
• Make Three Strings EqualEasy
• Separate Black and White BallsMedium
• Maximum Xor ProductMedium
• Find Building Where Alice and Bob Can MeetHard
• Maximum GCD-Sum of a SubarrayHard
• Find Words Containing CharacterEasy
• Maximize Area of Square Hole in GridMedium
• Minimum Number of Coins for FruitsMedium
• Find Maximum Non-decreasing Array LengthHard
• Matrix Similarity After Cyclic ShiftsEasy
• Count Beautiful Substrings IMedium
• Make Lexicographically Smallest Array by Swapping ElementsMedium
• Count Beautiful Substrings IIHard
• Number of Divisible SubstringsMedium
• Find the PeaksEasy
• Minimum Number of Coins to be AddedMedium
• Count Complete SubstringsHard
• Count the Number of Infection SequencesHard
• Number of Same-End SubstringsMedium
• Find Common Elements Between Two ArraysEasy
• Remove Adjacent Almost-Equal CharactersMedium
• Length of Longest Subarray With at Most K FrequencyMedium
• Number of Possible Sets of Closing BranchesHard
• Count Tested Devices After Test OperationsEasy
• Double Modular ExponentiationMedium
• Count Subarrays Where Max Element Appears at Least K TimesMedium
• Count the Number of Good PartitionsHard
• Number of Divisible Triplet SumsMedium
• Find Missing and Repeated ValuesEasy
• Divide Array Into Arrays With Max DifferenceMedium
• Minimum Cost to Make Array EqualindromicMedium
• Apply Operations to Maximize Frequency ScoreHard
• Minimum Number of Coins for Fruits IIHard
• Count the Number of Incremovable Subarrays IEasy
• Find Polygon With the Largest PerimeterMedium
• Count the Number of Incremovable Subarrays IIHard
• Find Number of Coins to Place in Tree NodesHard
• Minimum Number GameEasy
• Maximum Square Area by Removing Fences From a FieldMedium
• Minimum Cost to Convert String IMedium
• Minimum Cost to Convert String IIHard
• Symmetric CoordinatesMedium
• Most Expensive Item That Can Not Be BoughtMedium
• Check if Bitwise OR Has Trailing ZerosEasy
• Find Longest Special Substring That Occurs Thrice IMedium
• Find Longest Special Substring That Occurs Thrice IIMedium
• Palindrome Rearrangement QueriesHard
• Find Peak Calling Hours for Each CityMedium
• Calculate Compressed MeanEasy
• Find Third TransactionMedium
• Find Expensive CitiesEasy
• Manager of the Largest DepartmentMedium
• Class PerformanceMedium
• Loan TypesEasy
• Top Three Wineries Hard
• Number of Self-Divisible PermutationsMedium
• Friday Purchases IMedium
• Friday Purchases II Hard
• Viewers Turned StreamersHard
• Smallest Missing Integer Greater Than Sequential Prefix SumEasy
• Minimum Number of Operations to Make Array XOR Equal to KMedium
• Minimum Number of Operations to Make X and Y EqualMedium
• Count the Number of Powerful IntegersHard
• Maximum Area of Longest Diagonal RectangleEasy
• Minimum Moves to Capture The QueenMedium
• Maximum Size of a Set After RemovalsMedium
• Maximize the Number of Partitions After OperationsHard
• Maximum Subtree of the Same ColorMedium
• Count Elements With Maximum FrequencyEasy
• Find Beautiful Indices in the Given Array IMedium
• Maximum Number That Sum of the Prices Is Less Than or Equal to KMedium
• Find Beautiful Indices in the Given Array IIHard
• Maximum Number of Intersections on the ChartHard
• Divide an Array Into Subarrays With Minimum Cost IEasy
• Find if Array Can Be SortedMedium
• Minimize Length of Array Using OperationsMedium
• Divide an Array Into Subarrays With Minimum Cost IIHard
• Minimum Number of Pushes to Type Word IEasy
• Count the Number of Houses at a Certain Distance IMedium
• Minimum Number of Pushes to Type Word IIMedium
• Count the Number of Houses at a Certain Distance IIHard
• Maximum Number of Removal Queries That Can Be Processed IHard
• Number of Changing KeysEasy
• Find the Maximum Number of Elements in SubsetMedium
• Alice and Bob Playing Flower GameMedium
• Minimize OR of Remaining Elements Using OperationsHard
• Find Pattern in Infinite Stream IMedium
• Type of TriangleEasy
• Find the Number of Ways to Place People IMedium
• Maximum Good Subarray SumMedium
• Find the Number of Ways to Place People IIHard
• Ant on the BoundaryEasy
• Minimum Time to Revert Word to Initial State IMedium
• Find the Grid of Region AverageMedium
• Minimum Time to Revert Word to Initial State IIHard
• Count Numbers With Unique Digits IIEasy
• Modify the MatrixEasy
• Number of Subarrays That Match a Pattern IMedium
• Maximum Palindromes After OperationsMedium
• Number of Subarrays That Match a Pattern IIHard
• Find Pattern in Infinite Stream IIHard
• Maximum Number of Operations With the Same Score IEasy
• Apply Operations to Make String EmptyMedium
• Maximum Number of Operations With the Same Score IIMedium
• Maximize Consecutive Elements in an Array After ModificationHard
• Count Prefix and Suffix Pairs IEasy
• Find the Length of the Longest Common PrefixMedium
• Most Frequent PrimeMedium
• Count Prefix and Suffix Pairs IIHard
• Split the ArrayEasy
• Find the Largest Area of Square Inside Two RectanglesMedium
• Earliest Second to Mark Indices IMedium
• Earliest Second to Mark Indices IIHard
• Pizza Toppings Cost AnalysisMedium
• Find Candidates for Data Scientist PositionEasy
• Maximize ItemsHard
• Classifying Triangles by LengthsEasy
• Binary Tree NodesMedium
• Top Percentile FraudMedium
• Snaps AnalysisMedium
• Employees Project AllocationHard
• Friends With No Mutual FriendsMedium
• Find All Unique Email DomainsEasy
• User Activities within Time BoundsHard
• Calculate Trapping Rain WaterHard
• Winner of the Linked List GameEasy
• Linked List FrequencyEasy
• Guess the Number Using Bitwise Questions IMedium
• Minimum Operations to Exceed Threshold Value IEasy
• Minimum Operations to Exceed Threshold Value IIMedium
• Count Pairs of Connectable Servers in a Weighted Tree NetworkMedium
• Find the Maximum Sum of Node ValuesHard
• Distribute Elements Into Two Arrays IEasy
• Count Submatrices with Top-Left Element and Sum Less Than kMedium
• Minimum Operations to Write the Letter Y on a GridMedium
• Distribute Elements Into Two Arrays IIHard
• Maximum Increasing Triplet ValueMedium
• Apple Redistribution into BoxesEasy
• Maximize Happiness of Selected ChildrenMedium
• Shortest Uncommon Substring in an ArrayMedium
• Maximum Strength of K Disjoint SubarraysHard
• Match Alphanumerical Pattern in Matrix IMedium
• Find the Sum of Encrypted IntegersEasy
• Mark Elements on Array by Performing QueriesMedium
• Replace Question Marks in String to Minimize Its ValueMedium
• Find the Sum of the Power of All SubsequencesHard
• Existence of a Substring in a String and Its ReverseEasy
• Count Substrings Starting and Ending with Given CharacterMedium
• Minimum Deletions to Make String K-SpecialMedium
• Minimum Moves to Pick K OnesHard
• Find Trending HashtagsMedium
• Make String Anti-palindromeHard
• Find Bursty BehaviorMedium
• Maximum Length Substring With Two OccurrencesEasy
• Apply Operations to Make Sum of Array Greater Than or Equal to kMedium
• Most Frequent IDsMedium
• Longest Common Suffix QueriesHard
• Guess the Number Using Bitwise Questions IIMedium
• Shortest Subarray With OR at Least K IEasy
• Minimum Levels to Gain More PointsMedium
• Shortest Subarray With OR at Least K IIMedium
• Find the Sum of Subsequence PowersHard
• Harshad NumberEasy
• Water Bottles IIMedium
• Count Alternating SubarraysMedium
• Minimize Manhattan DistancesHard
• Find Trending Hashtags II Hard
• Find Longest Self-Contained SubstringHard
• Longest Strictly Increasing or Strictly Decreasing SubarrayEasy
• Lexicographically Smallest String After Operations With ConstraintMedium
• Minimum Operations to Make Median of Array Equal to KMedium
• Minimum Cost Walk in Weighted GraphHard