leetcode

Solution to some Leetcode problems written in C++
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Leetcode Solutions

DimitrijeD's LeetCode stats

Motivation

In this repo I want to share with you my solutions to some Leetcode problems written in C++ to practice my Algorithms and Data Structure skills. I will update this list periodically as I do more problems. I hope it will be helpful to some of you if you get stuck on a specific problem. Feel free to contact me if you have any questions.

Templates

I have accumulated a list of most commonly used algorithms to serve as a reference and a base for solving problems.

Problems

Number Difficulty Solution
0001 Easy Two Sum
0002 Medium Add Two Numbers
0003 Medium Longest Substring Without Repeating Characters
0004 Hard Median of Two Sorted Arrays
0005 Medium Longest Palindromic Substring
0006 Medium Zigzag Conversion
0007 Medium Reverse Integer
0008 Medium String to Integer (atoi)
0009 Easy Palindrome Number
0011 Medium Container With Most Water
0012 Medium Integer to Roman
0013 Easy Roman to Integer
0014 Easy Longest Common Prefix
0015 Medium 3Sum
0016 Medium 3Sum Closest
0017 Medium Letter Combinations of a Phone Number
0018 Medium 4Sum
0019 Medium Remove Nth Node From the End of List
0020 Easy Valid Parentheses
0021 Easy Merge Two Sorted Lists
0022 Medium Generate Parentheses
0023 Hard Merge k Sorted Lists
0024 Medium Swap Nodes in Pairs
0025 Hard Reverse Nodes in k-Group
0026 Easy Remove Duplicates from Sorted Array
0027 Easy Remove Element
0028 Medium Find the Index of the First Occurrence in a String
0029 Medium Divide Two Integers
0030 Hard Substring with Concatenation of All Words
0031 Medium Next Permutation
0032 Hard Longest Valid Parentheses
0033 Medium Search in Rotated Sorted Array
0034 Medium Find First and Last Position of Element in Sorted Array
0035 Easy Search Insert Position
0036 Medium Valid Sudoku
0037 Hard Sudoku Solver
0038 Medium Count and Say
0039 Medium Combination Sum
0040 Medium Combination Sum II
0041 Hard First Missing Positive
0042 Medium Trapping Rain Water
0043 Medium Multiply Strings
0044 Hard Wildcard Matching
0045 Medium Jump Game II
0046 Medium Permutations
0047 Medium Permutations II
0048 Medium Rotate Image
0049 Medium Group Anagrams
0050 Medium Pow(x, n)
0051 Hard N-Queens
0052 Hard N-Queens II
0053 Medium Maximum Subarray
0054 Medium Spiral Matrix
0055 Medium Jump Game
0056 Medium Merge Intervals
0057 Medium Insert Interval
0058 Easy Length of Last Word
0059 Medium Spiral Matrix II
0060 Hard Permutation Sequence
0061 Medium Rotate List
0062 Medium Unique Paths
0063 Medium Unique Paths II
0064 Medium Minimum Path Sum
0065 Hard Valid Number
0066 Easy Plus One
0067 Easy Add Binary
0068 Hard Text Justification
0069 Easy Sqrt(x)
0070 Easy Climbing Stairs
0071 Medium Simplify Path
0072 Hard Edit Distance
0073 Medium Set Matrix Zeroes
0074 Medium Search a 2D Matrix
0075 Medium Sort Colors
0076 Hard Minimum Window Substring
0077 Medium Combinations
0078 Medium Subsets
0079 Medium Word Search
0080 Medium Remove Duplicates from Sorted Array II
0081 Medium Search in Rotated Sorted Array II
0082 Medium Remove Duplicates from Sorted List II
0083 Easy Remove Duplicates from Sorted List
0084 Hard Largest Rectangle in Histogram
0085 Hard Maximal Rectangle
0086 Medium Partition List
0087 Hard Scramble String
0088 Easy Merge Sorted Array
0089 Medium Gray Code
0090 Medium Subsets II
0091 Medium Decode Ways
0092 Medium Reverse Linked List II
0093 Medium Restore IP Addresses
0094 Easy Binary Tree Inorder Traversal
0095 Medium Unique Binary Search Trees II
0096 Medium Unique Binary Search Trees
0097 Medium Interleaving String
0098 Medium Validate Binary Search Tree
0099 Medium Recover Binary Search Tree
0100 Easy Same Tree
0101 Easy Symmetric Tree
0102 Medium Binary Tree Level Order Traversal
0103 Medium Binary Tree Zigzag Level Order Traversal
0104 Easy Maximum Depth of Binary Tree
0105 Medium Construct Binary Tree from Preorder and Inorder Traversal
0106 Medium Construct Binary Tree from Inorder and Postorder Traversal
0107 Medium Binary Tree Level Order Traversal II
0108 Easy Convert Sorted Array to Binary Search Tree
0109 Medium Convert Sorted List to Binary Search Tree
0110 Easy Balanced Binary Tree
0111 Easy Minimum Depth of Binary Tree
0112 Easy Path Sum
0113 Medium Path Sum II
0114 Medium Flatten Binary Tree to Linked List
0115 Hard Distinct Subsequences
0116 Medium Populating Next Right Pointers in Each Node
0117 Medium Populating Next Right Pointers in Each Node II
0118 Easy Pascal's Triangle
0119 Easy Pascal's Triangle II
0120 Medium Triangle
0121 Easy Best Time to Buy and Sell Stock
0122 Medium Best Time to Buy and Sell Stock II
0123 Hard Best Time to Buy and Sell Stock III
0124 Hard Binary Tree Maximum Path Sum
0125 Easy Valid Palindrome
0126 Hard Word Ladder II
0127 Hard Word Ladder
0128 Medium Longest Consecutive Sequence
0129 Medium Sum Root to Leaf Numbers
0130 Medium Surrounded Regions
0131 Medium Palindrome Partitioning
0132 Hard Palindrome Partitioning II
0133 Medium Clone Graph
0134 Medium Gas Station
0135 Hard Candy
0136 Easy Single Number
0137 Medium Single Number II
0138 Medium Copy List with Random Pointer
0139 Medium Word Break
0140 Hard Word Break II
0141 Easy Linked List Cycle
0142 Medium Linked List Cycle II
0143 Medium Reorder List
0144 Medium Binary Tree Preorder Traversal
0145 Easy Binary Tree Postorder Traversal
0146 Medium LRU Cache
0147 Medium Insertion Sort List
0148 Medium Sort List
0149 Hard Max Points on a Line
0150 Medium Evaluate Reverse Polish Notation
0151 Medium Reverse Words in a String
0152 Medium Maximum Product Subarray
0153 Medium Find Minimum in Rotated Sorted Array
0154 Hard Find Minimum in Rotated Sorted Array II
0155 Medium Min Stack
0160 Easy Intersection of Two Linked Lists
0162 Medium Find Peak Element
0164 Hard Maximum Gap
0165 Medium Compare Version Numbers
0166 Medium Fraction to Recurring Decimal
0167 Medium Two Sum II - Input Array Is Sorted
0168 Easy Excel Sheet Column Title
0169 Easy Majority Element
0171 Easy Excel Sheet Column Number
0172 Medium Factorial Trailing Zeroes
0173 Medium Binary Search Tree Iterator
0174 Hard Dungeon Game
0175 Easy Combine Two Tables
0176 Medium Second Highest Salary
0177 Medium Nth Highest Salary
0178 Medium Rank Scores
0179 Medium Largest Number
0180 Medium Consecutive Numbers
0181 Easy Employees Earning More Than Their Managers
0182 Easy Duplicate Emails
0183 Easy Customers Who Never Order
0184 Medium Department Highest Salary
0185 Hard Department Top Three Salaries
0187 Medium Repeated DNA Sequences
0188 Hard Best Time to Buy and Sell Stock IV
0189 Medium Rotate Array
0190 Easy Reverse Bits
0191 Easy Number of 1 Bits
0192 Medium Word Frequency
0193 Easy Valid Phone Numbers
0194 Medium Transpose File
0195 Easy Tenth Line
0196 Easy Delete Duplicate Emails
0197 Easy Rising Temperature
0198 Medium House Robber
0199 Medium Binary Tree Right Side View
0200 Medium Number of Islands
0201 Medium Bitwise AND of Numbers Range
0202 Easy Happy Number
0203 Easy Remove Linked List Elements
0204 Medium Count Primes
0205 Easy Isomorphic Strings
0206 Easy Reverse Linked List
0207 Medium Course Schedule
0208 Medium Implement Trie (Prefix Tree)
0209 Medium Minimum Size Subarray Sum
0210 Medium Course Schedule II
0211 Medium Design Add and Search Words Data Structure
0212 Hard Word Search II
0213 Medium House Robber II
0214 Hard Shortest Palindrome
0215 Medium Kth Largest Element in an Array
0216 Medium Combination Sum III
0217 Easy Contains Duplicate
0218 Hard The Skyline Problem
0219 Easy Contains Duplicate II
0220 Hard Contains Duplicate III
0221 Medium Maximal Square
0222 Medium Count Complete Tree Nodes
0223 Medium Rectangle Area
0224 Hard Basic Calculator
0225 Easy Implement Stack using Queues
0226 Easy Invert Binary Tree
0227 Medium Basic Calculator II
0228 Easy Summary Ranges
0229 Medium Majority Element II
0231 Easy Power of Two
0232 Easy Implement Queue using Stacks
0233 Hard Number of Digit One
0234 Easy Palindrome Linked List
0235 Medium Lowest Common Ancestor of a Binary Search Tree
0236 Medium Lowest Common Ancestor of a Binary Tree
0237 Medium Delete Node in a Linked List
0238 Medium Product of Array Except Self
0239 Hard Sliding Window Maximum
0240 Medium Search a 2D Matrix II
0241 Medium Different Ways to Add Parentheses
0242 Easy Valid Anagram
0257 Easy Binary Tree Paths
0258 Easy Add Digits
0260 Medium Single Number III
0262 Hard Trips and Users
0263 Easy Ugly Number
0264 Medium Ugly Number II
0268 Easy Missing Number
0273 Hard Integer to English Words
0274 Medium H-Index
0275 Medium H-Index II
0278 Easy First Bad Version
0279 Medium Perfect Squares
0282 Hard Expression Add Operators
0283 Easy Move Zeroes
0284 Medium Peeking Iterator
0287 Medium Find the Duplicate Number
0289 Medium Game of Life
0290 Easy Word Pattern
0292 Easy Nim Game
0295 Hard Find Median from Data Stream
0297 Hard Serialize and Deserialize Binary Tree
0299 Medium Bulls and Cows
0300 Medium Longest Increasing Subsequence
0301 Hard Remove Invalid Parentheses
0303 Easy Range Sum Query - Immutable
0304 Medium Range Sum Query 2D - Immutable
0306 Medium Additive Number
0307 Medium Range Sum Query - Mutable
0309 Medium Best Time to Buy and Sell Stock with Cooldown
0310 Medium Minimum Height Trees
0312 Hard Burst Balloons
0313 Medium Super Ugly Number
0315 Hard Count of Smaller Numbers After Self
0316 Medium Remove Duplicate Letters
0318 Medium Maximum Product of Word Lengths
0319 Medium Bulb Switcher
0321 Hard Create Maximum Number
0322 Medium Coin Change
0324 Medium Wiggle Sort II
0326 Easy Power of Three
0327 Hard Count of Range Sum
0328 Medium Odd Even Linked List
0329 Hard Longest Increasing Path in a Matrix
0330 Hard Patching Array
0331 Medium Verify Preorder Serialization of a Binary Tree
0332 Hard Reconstruct Itinerary
0334 Medium Increasing Triplet Subsequence
0336 Hard Palindrome Pairs
0337 Medium House Robber III
0338 Easy Counting Bits
0341 Medium Flatten Nested List Iterator
0342 Easy Power of Four
0343 Medium Integer Break
0344 Easy Reverse String
0345 Easy Reverse Vowels of a String
0347 Medium Top K Frequent Elements
0349 Easy Intersection of Two Arrays
0350 Easy Intersection of Two Arrays II
0352 Hard Data Stream as Disjoint Intervals
0354 Hard Russian Doll Envelopes
0355 Medium Design Twitter
0357 Medium Count Numbers with Unique Digits
0365 Medium Water and Jug Problem
0367 Easy Valid Perfect Square
0368 Medium Largest Divisible Subset
0371 Medium Sum of Two Integers
0373 Medium Find K Pairs with Smallest Sums
0374 Easy Guess Number Higher or Lower
0375 Medium Guess Number Higher or Lower II
0376 Medium Wiggle Subsequence
0377 Medium Combination Sum IV
0378 Medium Kth Smallest Element in a Sorted Matrix
0380 Medium Insert Delete GetRandom O(1)
0382 Medium Linked List Random Node
0383 Easy Ransom Note
0384 Medium Shuffle an Array
0385 Medium Mini Parser
0386 Medium Lexicographical Numbers
0387 Easy First Unique Character in a String
0388 Medium Longest Absolute File Path
0389 Easy Find the Difference
0390 Medium Elimination Game
0392 Easy Is Subsequence
0393 Medium UTF-8 Validation
0394 Medium Decode String
0395 Medium Longest Substring with At Least K Repeating Characters
0396 Medium Rotate Function
0397 Medium Integer Replacement
0398 Medium Random Pick Index
0399 Medium Evaluate Division
0401 Easy Binary Watch
0402 Medium Remove K Digits
0403 Hard Frog Jump
0404 Easy Sum of Left Leaves
0405 Easy Convert a Number to Hexadecimal
0406 Medium Queue Reconstruction by Height
0409 Easy Longest Palindrome
0410 Hard Split Array Largest Sum
0412 Easy Fizz Buzz
0413 Medium Arithmetic Slices
0414 Easy Third Maximum Number
0415 Easy Add Strings
0416 Medium Partition Equal Subset Sum
0417 Medium Pacific Atlantic Water Flow
0419 Medium Battleships in a Board
0421 Medium Maximum XOR of Two Numbers in an Array
0423 Medium Reconstruct Original Digits from English
0424 Medium Longest Repeating Character Replacement
0427 Medium Construct Quad Tree
0429 Medium N-ary Tree Level Order Traversal
0430 Medium Flatten a Multilevel Doubly Linked list
0432 Hard All O`one Data Structure
0433 Medium Minimum Genetic Mutation
0434 Easy Number of Segments in a String
0435 Medium Non-overlapping Intervals
0436 Medium Find Right Interval
0437 Medium Path Sum III
0438 Medium Find All Anagrams in a String
0440 Hard K-th Smallest in Lexicographical Order
0441 Easy Arranging Coins
0442 Medium Find All Duplicates in an Array
0443 Medium String Compression
0445 Medium Add Two Numbers II
0446 Hard Arithmetic Slices II - Subsequence
0447 Medium Number of Boomerangs
0448 Easy Find All Numbers Disappeared in an Array
0449 Medium Serialize and Deserialize BST
0450 Medium Delete Node in a BST
0451 Medium Sort Characters By Frequency
0452 Medium Minimum Number of Arrows to Burst Balloons
0453 Medium Minimum Moves to Equal Array Elements
0454 Medium 4Sum II
0455 Easy Assign Cookies
0456 Medium 132 Pattern
0457 Medium Circular Array Loop
0458 Hard Poor Pigs
0459 Easy Repeated Substring Pattern
0460 Hard LFU Cache
0461 Easy Hamming Distance
0462 Medium Minimum Moves to Equal Array Elements II
0463 Easy Island Perimeter
0464 Medium Can I Win
0467 Medium Unique Substrings in Wraparound String
0468 Medium Validate IP Address
0472 Hard Concatenated Words
0473 Medium Matchsticks to Square
0474 Medium Ones and Zeroes
0475 Medium Heaters
0476 Easy Number Complement
0477 Medium Total Hamming Distance
0481 Medium Magical String
0482 Easy License Key Formatting
0485 Easy Max Consecutive Ones
0486 Medium Reachable Nodes With Restrictions
0491 Medium Non-decreasing Subsequences
0492 Easy Construct the Rectangle
0493 Hard Reverse Pairs
0494 Medium Target Sum
0496 Medium Next Greater Element I
0498 Medium Diagonal Traverse
0501 Easy Find Mode in Binary Search Tree
0502 Hard IPO
0503 Medium Next Greater Element II
0506 Easy Relative Ranks
0508 Medium Most Frequent Subtree Sum
0509 Easy Fibonacci Number
0511 Easy Game Play Analysis I
0513 Medium Find Bottom Left Tree Value
0514 Hard Freedom Trail
0515 Medium Find Largest Value in Each Tree Row
0516 Medium Longest Palindromic Subsequence
0518 Medium Coin Change II
0520 Easy Detect Capital
0522 Medium Longest Uncommon Subsequence II
0523 Medium Continuous Subarray Sum
0524 Medium Longest Word in Dictionary through Deleting
0525 Medium Contiguous Array
0526 Medium Beautiful Arrangement
0529 Medium Minesweeper
0530 Easy Minimum Absolute Difference in BST
0532 Medium K-diff Pairs in an Array
0535 Medium Encode and Decode TinyURL
0537 Medium Complex Number Multiplication
0538 Medium Convert BST to Greater Tree
0539 Medium Minimum Time Difference
0540 Medium Single Element in a Sorted Array
0542 Medium 01 Matrix
0543 Easy Diameter of Binary Tree
0546 Hard Remove Boxes
0547 Medium Number of Provinces
0550 Medium Game Play Analysis IV
0552 Hard Student Attendance Record II
0553 Medium Optimal Division
0554 Medium Brick Wall
0556 Medium Next Greater Element III
0557 Easy Reverse Words in a String III
0559 Easy Maximum Depth of N-ary Tree
0560 Medium Subarray Sum Equals K
0561 Easy Array Partition
0563 Easy Binary Tree Tilt
0564 Hard Find the Closest Palindrome
0565 Medium Array Nesting
0566 Easy Reshape the Matrix
0567 Medium Permutation in String
0570 Medium Managers with at Least 5 Direct Reports
0572 Easy Subtree of Another Tree
0576 Medium Out of Boundary Paths
0577 Easy Employee Bonus
0581 Medium Shortest Unsorted Continuous Subarray
0583 Medium Delete Operation for Two Strings
0584 Easy Find Customer Referee
0585 Medium Investments in 2016
0586 Easy Customer Placing the Largest Number of Orders
0587 Hard Erect the Fence
0589 Easy N-ary Tree Preorder Traversal
0590 Easy N-ary Tree Postorder Traversal
0592 Medium Fraction Addition and Subtraction
0593 Medium Valid Square
0595 Easy Big Countries
0596 Easy Classes More Than 5 Students
0601 Hard Human Traffic of Stadium
0602 Medium Friend Requests II: Who Has the Most Friends
0605 Easy Can Place Flowers
0606 Easy Construct String from Binary Tree
0607 Easy Sales Person
0608 Medium Tree Node
0609 Medium Find Duplicate File in System
0610 Easy Triangle Judgement
0611 Medium Valid Triangle Number
0617 Easy Merge Two Binary Trees
0619 Easy Biggest Single Number
0620 Easy Not Boring Movies
0621 Medium Task Scheduler
0622 Medium Design Circular Queue
0623 Medium Add One Row to Tree
0624 Medium Maximum Distance in Arrays
0626 Medium Exchange Seats
0627 Easy Swap Salary
0629 Hard K Inverse Pairs Array
0632 Hard Smallest Range Covering Elements from K Lists
0633 Medium Sum of Square Numbers
0636 Medium Exclusive Time of Functions
0637 Easy Average of Levels in Binary Tree
0638 Medium Shopping Offers
0640 Medium Solve the Equation
0641 Medium Design Circular Deque
0643 Easy Maximum Average Subarray I
0645 Easy Set Mismatch
0646 Medium Maximum Length of Pair Chain
0647 Medium Palindromic Substrings
0648 Medium Replace Words
0649 Medium Dota2 Senate
0650 Medium 2 Keys Keyboard
0652 Medium Find Duplicate Subtrees
0653 Easy Two Sum IV - Input is a BST
0654 Medium Maximum Binary Tree
0655 Medium Print Binary Tree
0658 Medium Find K Closest Elements
0659 Medium Split Array into Consecutive Subsequences
0661 Easy Image Smoother
0662 Medium Maximum Width of Binary Tree
0664 Hard Strange Printer
0665 Medium Non-decreasing Array
0667 Medium Beautiful Arrangement II
0669 Medium Trim a Binary Search Tree
0670 Medium Maximum Swap
0671 Easy Second Minimum Node In a Binary Tree
0672 Medium Bulb Switcher II
0673 Medium Number of Longest Increasing Subsequence
0676 Medium Implement Magic Dictionary
0677 Medium Map Sum Pairs
0678 Medium Valid Parenthesis String
0684 Medium Redundant Connection
0687 Medium Longest Univalue Path
0688 Medium Knight Probability in Chessboard
0689 Hard Maximum Sum of 3 Non-Overlapping Subarrays
0690 Medium Employee Importance
0692 Medium Top K Frequent Words
0695 Medium Max Area of Island
0698 Medium Partition to K Equal Sum Subsets
0699 Hard Falling Squares
0700 Easy Search in a Binary Search Tree
0701 Medium Insert into a Binary Search Tree
0703 Easy Kth Largest Element in a Stream
0704 Easy Binary Search
0705 Easy Design HashSet
0706 Easy Design HashMap
0707 Medium Design Linked List
0712 Medium Minimum ASCII Delete Sum for Two Strings
0713 Medium Subarray Product Less Than K
0714 Medium Best Time to Buy and Sell Stock with Transaction Fee
0715 Hard Range Module
0717 Easy 1-bit and 2-bit Characters
0718 Medium Maximum Length of Repeated Subarray
0719 Hard Find K-th Smallest Pair Distance
0720 Medium Longest Word in Dictionary
0722 Medium Remove Comments
0724 Easy Find Pivot Index
0725 Medium Split Linked List in Parts
0726 Hard Number of Atoms
0729 Medium My Calendar I
0731 Medium My Calendar II
0732 Hard My Calendar III
0733 Easy Flood Fill
0735 Medium Asteroid Collision
0738 Medium Monotone Increasing Digits
0739 Medium Daily Temperatures
0740 Medium Delete and Earn
0743 Medium Network Delay Time
0744 Easy Find Smallest Letter Greater Than Target
0746 Easy Min Cost Climbing Stairs
0747 Easy Largest Number At Least Twice of Others
0752 Medium Open the Lock
0754 Medium Reach a Number
0756 Medium Pyramid Transition Matrix
0763 Medium Partition Labels
0767 Medium Reorganize String
0769 Medium Max Chunks To Make Sorted
0771 Easy Jewels and Stones
0773 Hard Sliding Puzzle
0778 Hard Swim in Rising Water
0779 Medium K-th Symbol in Grammar
0781 Medium Rabbits in Forest
0783 Easy Minimum Distance Between BST Nodes
0784 Medium Letter Case Permutation
0785 Medium Is Graph Bipartite?
0786 Medium K-th Smallest Prime Fraction
0787 Medium Cheapest Flights Within K Stops
0788 Medium Rotated Digits
0789 Medium Escape The Ghosts
0790 Medium Domino and Tromino Tiling
0791 Medium Custom Sort String
0792 Medium Number of Matching Subsequences
0795 Medium Number of Subarrays with Bounded Maximum
0796 Easy Rotate String
0797 Medium All Paths From Source to Target
0799 Medium Champagne Tower
0802 Medium Find Eventual Safe States
0807 Medium Max Increase to Keep City Skyline
0808 Medium Soup Servings
0811 Medium Subdomain Visit Count
0813 Medium Largest Sum of Averages
0814 Medium Binary Tree Pruning
0815 Hard Bus Routes
0816 Medium Ambiguous Coordinates
0817 Medium Linked List Components
0820 Medium Short Encoding of Words
0823 Medium Binary Trees With Factors
0826 Medium Most Profit Assigning Work
0830 Medium Kth Smallest Element in a BST
0831 Medium Masking Personal Information
0833 Medium Find And Replace in String
0834 Hard Sum of Distances in Tree
0835 Medium Image Overlap
0837 Medium New 21 Game
0838 Medium Push Dominoes
0839 Hard Similar String Groups
0840 Medium Magic Squares In Grid
0841 Medium Keys and Rooms
0844 Easy Backspace String Compare
0846 Medium Hand of Straights
0847 Hard Shortest Path Visiting All Nodes
0851 Medium Loud and Rich
0852 Medium Peak Index in a Mountain Array
0853 Medium Car Fleet
0856 Medium Score of Parentheses
0857 Hard Minimum Cost to Hire K Workers
0858 Medium Mirror Reflection
0859 Easy Buddy Strings
0860 Easy Lemonade Change
0861 Medium Score After Flipping Matrix
0862 Hard Shortest Subarray with Sum at Least K
0863 Medium All Nodes Distance K in Binary Tree
0864 Hard Shortest Path to Get All Keys
0865 Medium Smallest Subtree with all the Deepest Nodes
0867 Easy Transpose Matrix
0869 Medium Reordered Power of 2
0870 Medium Advantage Shuffle
0872 Easy Leaf-Similar Trees
0874 Medium Walking Robot Simulation
0875 Medium Koko Eating Bananas
0876 Easy Middle of the Linked List
0877 Medium Stone Game
0879 Hard Profitable Schemes
0880 Medium Decoded String at Index
0881 Medium Boats to Save People
0884 Easy Uncommon Words from Two Sentences
0885 Medium Spiral Matrix III
0886 Medium Possible Bipartition
0889 Medium Construct Binary Tree from Preorder and Postorder Traversal
0890 Medium Find and Replace Pattern
0893 Medium Groups of Special-Equivalent Strings
0894 Medium All Possible Full Binary Trees
0895 Hard Maximum Frequency Stack
0896 Easy Monotonic Array
0897 Easy Increasing Order Search Tree
0900 Medium RLE Iterator
0901 Medium Online Stock Span
0904 Medium Fruit Into Baskets
0905 Easy Sort Array By Parity
0907 Medium Sum of Subarray Minimums
0909 Medium Snakes and Ladders
0911 Medium Online Election
0912 Medium Sort an Array
0915 Medium Partition Array into Disjoint Intervals
0916 Medium Word Subsets
0918 Medium Maximum Sum Circular Subarray
0919 Medium Complete Binary Tree Inserter
0920 Hard Number of Music Playlists
0921 Medium Minimum Add to Make Parentheses Valid
0926 Medium Flip String to Monotone Increasing
0930 Medium Binary Subarrays With Sum
0931 Medium Minimum Falling Path Sum
0932 Medium Beautiful Array
0933 Easy Number of Recent Calls
0934 Medium Shortest Bridge
0935 Medium Knight Dialer
0937 Medium Reorder Data in Log Files
0938 Easy Range Sum of BST
0939 Medium Minimum Area Rectangle
0941 Easy Valid Mountain Array
0944 Easy Delete Columns to Make Sorted
0945 Medium Minimum Increment to Make Array Unique
0946 Medium Validate Stack Sequences
0947 Medium Most Stones Removed with Same Row or Column
0948 Medium Bag of Tokens
0950 Medium Reveal Cards In Increasing Order
0951 Medium Flip Equivalent Binary Trees
0953 Easy Verifying an Alien Dictionary
0956 Medium Tallest Billboard
0958 Medium Check Completeness of a Binary Tree
0959 Medium Regions Cut By Slashes
0962 Medium Maximum Width Ramp
0965 Easy Univalued Binary Tree
0966 Medium Vowel Spellchecker
0967 Medium Numbers With Same Consecutive Differences
0969 Medium Pancake Sorting
0973 Medium K Closest Points to Origin
0974 Medium Subarray Sums Divisible by K
0977 Easy Squares of a Sorted Array
0979 Medium Distribute Coins in Binary Tree
0980 Hard Unique Paths III
0981 Medium Time Based Key-Value Store
0983 Medium Minimum Cost For Tickets
0985 Medium Sum of Even Numbers After Queries
0986 Medium Interval List Intersections
0988 Medium Smallest String Starting From Leaf
0989 Easy Add to Array-Form of Integer
0990 Medium Satisfiability of Equality Equations
0991 Medium Broken Calculator
0992 Hard Subarrays with K Different Integers
0993 Easy Cousins in Binary Tree
0994 Medium Rotting Oranges
0995 Hard Minimum Number of K Consecutive Bit Flips
0997 Easy Find the Town Judge
0998 Medium Maximum Binary Tree II
1002 Easy Find Common Characters
1003 Medium Check If Word Is Valid After Substitutions
1004 Medium Max Consecutive Ones III
1006 Medium Clumsy Factorial
1007 Medium Minimum Domino Rotations For Equal Row
1008 Medium Construct Binary Search Tree from Preorder Traversal
1009 Easy Complement of Base 10 Integer
1010 Medium Pairs of Songs With Total Durations Divisible by 60
1011 Medium Capacity To Ship Packages Within D Days
1014 Medium Best Sightseeing Pair
1016 Medium Binary String With Substrings Representing 1 To N
1017 Medium Convert to Base -2
1019 Medium Next Greater Node In Linked List
1020 Medium Number of Enclaves
1022 Easy Sum of Root To Leaf Binary Numbers
1023 Medium Camelcase Matching
1024 Medium Video Stitching
1026 Medium Maximum Difference Between Node and Ancestor
1027 Medium Longest Arithmetic Subsequence
1029 Medium Two City Scheduling
1031 Medium Maximum Sum of Two Non-Overlapping Subarrays
1033 Medium Moving Stones Until Consecutive
1035 Medium Uncrossed Lines
1038 Medium Binary Search Tree to Greater Sum Tree
1039 Medium Minimum Score Triangulation of Polygon
1040 Medium Moving Stones Until Consecutive II
1041 Medium Robot Bounded In Circle
1042 Medium Flower Planting With No Adjacent
1043 Medium Partition Array for Maximum Sum
1045 Medium Customers Who Bought All Products
1046 Easy Last Stone Weight
1047 Easy Remove All Adjacent Duplicates In String
1048 Medium Longest String Chain
1049 Medium Last Stone Weight II
1050 Easy Actors and Directors Who Cooperated At Least Three Times
1051 Easy Height Checker
1052 Medium Grumpy Bookstore Owner
1061 Medium Lexicographically Smallest Equivalent String
1068 Easy Product Sales Analysis I
1070 Medium Product Sales Analysis III
1071 Easy Greatest Common Divisor of Strings
1072 Medium Flip Columns For Maximum Number of Equal Rows
1074 Hard Number of Submatrices That Sum to Target
1075 Easy Project Employees I
1079 Medium Letter Tile Possibilities
1080 Medium Insufficient Nodes in Root to Leaf Paths
1081 Medium Smallest Subsequence of Distinct Characters
1084 Easy Sales Analysis III
1089 Easy Duplicate Zeros
1090 Medium Largest Values From Labels
1091 Medium Shortest Path in Binary Matrix
1094 Medium Car Pooling
1095 Easy Find Numbers with Even Number of Digits
1095 Hard Find in Mountain Array
1099 Easy Replace Elements with Greatest Element on Right Side
1104 Medium Path In Zigzag Labelled Binary Tree
1105 Medium Filling Bookcase Shelves
1106 Hard Parsing A Boolean Expression
1108 Easy Defanging an IP Address
1109 Medium Corporate Flight Bookings
1110 Medium Delete Nodes And Return Forest
1111 Medium Maximum Nesting Depth of Two Valid Parentheses Strings
1122 Easy Relative Sort Array
1123 Medium Lowest Common Ancestor of Deepest Leaves
1125 Hard Smallest Sufficient Team
1129 Medium Shortest Path with Alternating Colors
1130 Medium Minimum Cost Tree From Leaf Values
1137 Easy N-th Tribonacci Number
1138 Medium Alphabet Board Path
1139 Medium Largest 1-Bordered Square
1140 Medium Stone Game II
1141 Easy User Activity for the Past 30 Days I
1143 Medium Longest Common Subsequence
1145 Medium Binary Tree Coloring Game
1146 Medium Snapshot Array
1148 Easy Article Views I
1155 Medium Number of Dice Rolls With Target Sum
1158 Medium Market Analysis I
1160 Easy Find Words That Can Be Formed by Characters
1161 Medium Maximum Level Sum of a Binary Tree
1162 Medium As Far from Land as Possible
1164 Medium Product Price at a Given Date
1170 Medium Compare Strings by Frequency of the Smallest Character
1171 Medium Remove Zero Sum Consecutive Nodes from Linked List
1174 Medium Immediate Food Delivery II
1179 Easy Reformat Department Table
1187 Hard Make Array Strictly Increasing
1190 Medium Reverse Substrings Between Each Pair of Parentheses
1193 Medium Monthly Transactions I
1202 Medium Smallest String With Swaps
1203 Hard Sort Items by Groups Respecting Dependencies
1204 Medium Last Person to Fit in the Bus
1207 Easy Unique Number of Occurrences
1208 Medium Get Equal Substrings Within Budget
1209 Medium Remove All Adjacent Duplicates in String II
1211 Easy Queries Quality and Percentage
1218 Medium Longest Arithmetic Subsequence of Given Difference
1219 Medium Path with Maximum Gold
1220 Hard Count Vowels Permutation
1221 Easy Split a String in Balanced Strings
1222 Medium Queens That Can Attack the King
1227 Medium Airplane Seat Assignment Probability
1232 Easy Check If It Is a Straight Line
1233 Medium Remove Sub-Folders from the Filesystem
1235 Hard Maximum Profit in Job Scheduling
1237 Medium Find Positive Integer Solution for a Given Equation
1238 Medium Circular Permutation in Binary Representation
1239 Medium Maximum Length of a Concatenated String with Unique Characters
1247 Medium Minimum Swaps to Make Strings Equal
1248 Medium Count Number of Nice Subarrays
1249 Medium Minimum Remove to Make Valid Parentheses
1251 Easy Average Selling Price
1254 Medium Number of Closed Islands
1255 Hard Maximum Score Words Formed by Letters
1261 Medium Find Elements in a Contaminated Binary Tree
1262 Medium Greatest Sum Divisible by Three
1262 Medium Greatest Sum Divisible by Three
1266 Easy Minimum Time Visiting All Points
1267 Medium Count Servers that Communicate
1268 Medium Search Suggestions System
1269 Hard Number of Ways to Stay in the Same Place After Some Steps
1276 Medium Number of Burgers with No Waste of Ingredients
1277 Medium Count Square Submatrices with All Ones
1280 Easy Students and Examinations
1281 Easy Subtract the Product and Sum of Digits of an Integer
1282 Medium Group the People Given the Group Size They Belong To
1283 Medium Find the Smallest Divisor Given a Threshold
1284 Hard Minimum Number of Flips to Convert Binary Matrix to Zero Matrix
1286 Medium Iterator for Combination
1287 Easy Element Appearing More Than 25% In Sorted Array
1288 Medium Remove Covered Intervals
1289 Hard Minimum Falling Path Sum II
1290 Easy Convert Binary Number in a Linked List to Integer
1291 Medium Sequential Digits
1292 Medium Maximum Side Length of a Square with Sum Less than or Equal to Threshold
1296 Medium Divide Array in Sets of K Consecutive Numbers
1297 Medium Maximum Number of Occurrences of a Substring
1302 Medium Deepest Leaves Sum
1305 Medium All Elements in Two Binary Search Trees
1306 Medium Jump Game III
1310 Medium XOR Queries of a Subarray
1311 Medium Get Watched Videos by Your Friends
1312 Hard Minimum Insertion Steps to Make a String Palindrome
1313 Easy Decompress Run-Length Encoded List
1314 Medium Matrix Block Sum
1315 Medium Sum of Nodes with Even-Valued Grandparent
1318 Medium Minimum Flips to Make a OR b Equal to c
1319 Medium Number of Operations to Make Network Connected
1321 Medium Restaurant Growth
1323 Easy Maximum 69 Number
1324 Medium Print Words Vertically
1325 Medium Delete Leaves With a Given Value
1326 Hard Minimum Number of Taps to Open to Water a Garden
1327 Easy List the Products Ordered in a Period
1328 Medium Break a Palindrome
1329 Medium Sort the Matrix Diagonally
1331 Easy Rank Transform of an Array
1333 Medium Filter Restaurants by Vegan-Friendly, Price and Distance
1334 Medium Find the City With the Smallest Number of Neighbors at a Threshold Distance
1335 Hard Minimum Difficulty of a Job Schedule
1337 Easy The K Weakest Rows in a Matrix
1338 Medium Reduce Array Size to The Half
1339 Medium Maximum Product of Splitted Binary Tree
1341 Medium Movie Rating
1342 Easy Number of Steps to Reduce a Number to Zero
1343 Medium Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold
1344 Medium Angle Between Hands of a Clock
1345 Hard Jump Game IV
1346 Easy Check if N and Its Double Exist
1347 Medium Minimum Number of Steps to Make Two Strings Anagram
1351 Easy Count Negative Numbers in a Sorted Matrix
1352 Medium Product of the Last K Numbers
1356 Easy Sort Integers by The Number of 1 Bits
1357 Medium Apply Discount Every n Orders
1358 Medium Number of Substrings Containing All Three Characters
1359 Hard Count All Valid Pickup and Delivery Options
1361 Medium Validate Binary Tree Nodes
1362 Medium Closest Divisors
1365 Easy How Many Numbers Are Smaller Than the Current Number
1366 Medium Rank Teams by Votes
1367 Medium Linked List in Binary Tree
1371 Medium Find the Longest Substring Containing Vowels in Even Counts
1372 Medium Longest ZigZag Path in a Binary Tree
1373 Hard Maximum Sum BST in Binary Tree
1375 Medium Number of Times Binary String Is Prefix-Aligned
1376 Medium Time Needed to Inform All Employees
1378 Easy Replace Employee ID With The Unique Identifier
1379 Easy Find a Corresponding Node of a Binary Tree in a Clone of That Tree
1380 Easy Lucky Numbers in a Matrix
1381 Medium Design a Stack With Increment Operation
1382 Medium Balance a Binary Search Tree
1387 Medium Sort Integers by The Power Value
1389 Easy Create Target Array in the Given Order
1393 Medium Capital Gain/Loss
1395 Medium Count Number of Teams
1396 Medium Design Underground System
1400 Medium Construct K Palindrome Strings
1402 Hard Reducing Dishes
1404 Medium Number of Steps to Reduce a Number in Binary Representation to One
1405 Medium Longest Happy String
1406 Hard Stone Game III
1407 Easy Top Travellers
1409 Medium Queries on a Permutation With Key
1410 Medium HTML Entity Parser
1414 Medium Find the Minimum Number of Fibonacci Numbers Whose Sum Is K
1415 Medium The k-th Lexicographical String of All Happy Strings of Length n
1416 Hard Restore The Array
1418 Medium Display Table of Food Orders in a Restaurant
1419 Medium Minimum Number of Frogs Croaking
1420 Hard Build Array Where You Can Find The Maximum Exactly K Comparisons
1422 Easy Maximum Score After Splitting a String
1423 Medium Maximum Points You Can Obtain from Cards
1424 Medium Diagonal Traverse II
1425 Hard Constrained Subsequence Sum
1431 Easy Kids With the Greatest Number of Candies
1433 Medium Check If a String Can Break Another String
1436 Easy Destination City
1438 Medium Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
1441 Medium Build an Array With Stack Operations
1442 Medium Count Triplets That Can Form Two Arrays of Equal XOR
1443 Medium Minimum Time to Collect All Apples in a Tree
1444 Hard Number of Ways of Cutting a Pizza
1447 Medium Simplified Fractions
1448 Medium Count Good Nodes in Binary Tree
1451 Medium Rearrange Words in a Sentence
1452 Medium People Whose List of Favorite Companies Is Not a Subset of Another List
1455 Easy Check If a Word Occurs As a Prefix of Any Word in a Sentence
1456 Medium Maximum Number of Vowels in a Substring of Given Length
1457 Medium Pseudo-Palindromic Paths in a Binary Tree
1458 Hard Max Dot Product of Two Subsequences
1460 Easy Make Two Arrays Equal by Reversing Subarrays
1461 Medium Check If a String Contains All Binary Codes of Size K
1462 Medium Course Schedule IV
1463 Hard Cherry Pickup II
1464 Easy Maximum Product of Two Elements in an Array
1466 Medium Reorder Routes to Make All Paths Lead to the City Zero
1470 Easy Shuffle the Array
1471 Medium The k Strongest Values in an Array
1472 Medium Design Browser History
1475 Easy Final Prices With a Special Discount in a Shop
1476 Medium Subrectangle Queries
1480 Easy Running Sum of 1d Array
1481 Medium Least Number of Unique Integers after K Removals
1482 Medium Minimum Number of Days to Make m Bouquets
1484 Easy Group Sold Products By The Date
1486 Easy XOR Operation in an Array
1489 Hard Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree
1491 Easy Average Salary Excluding the Minimum and Maximum Salary
1492 Medium The kth Factor of n
1493 Medium Longest Subarray of 1's After Deleting One Element
1496 Easy Path Crossing
1497 Medium Check If Array Pairs Are Divisible by k
1498 Medium Number of Subsequences That Satisfy the Given Sum Condition
1502 Easy Can Make Arithmetic Progression From Sequence
1503 Medium Last Moment Before All Ants Fall Out of a Plank
1504 Medium Count Submatrices With All Ones
1508 Medium Range Sum of Sorted Subarray Sums
1509 Medium Minimum Difference Between Largest and Smallest Value in Three Moves
1512 Easy Number of Good Pairs
1514 Medium Path with Maximum Probability
1517 Easy Find Users With Valid E-Mails
1518 Easy Water Bottles
1519 Medium Number of Nodes in the Sub-Tree With the Same Label
1523 Easy Count Odd Numbers in an Interval Range
1525 Medium Number of Good Ways to Split a String
1526 Hard Minimum Number of Increments on Subarrays to Form a Target Array
1527 Easy Patients With a Condition
1529 Medium Minimum Suffix Flips
1530 Medium Number of Good Leaf Nodes Pairs
1531 Hard String Compression II
1535 Medium Find the Winner of an Array Game
1539 Easy Kth Missing Positive Number
1541 Medium Minimum Insertions to Balance a Parentheses String
1544 Easy Make The String Great
1545 Medium Find Kth Bit in Nth Binary String
1547 Hard Minimum Cost to Cut a Stick
1550 Easy Three Consecutive Odds
1551 Medium Minimum Operations to Make Array Equal
1552 Medium Magnetic Force Between Two Balls
1557 Medium Minimum Number of Vertices to Reach All Nodes
1558 Medium Minimum Numbers of Function Calls to Make Target Array
1561 Medium Maximum Number of Coins You Can Get
1567 Medium Maximum Length of Subarray With Positive Product
1568 Hard Minimum Number of Days to Disconnect Island
1569 Hard Number of Ways to Reorder Array to Get Same BST
1572 Easy Matrix Diagonal Sum
1574 Medium Shortest Subarray to be Removed to Make Array Sorted
1575 Medium Count All Possible Routes
1578 Medium Minimum Time to Make Rope Colorful
1579 Hard Remove Max Number of Edges to Keep Graph Fully Traversable
1581 Easy Customer Who Visited but Did Not Make Any Transactions
1582 Easy Special Positions in a Binary Matrix
1583 Medium Count Unhappy Friends
1584 Medium Min Cost to Connect All Points
1587 Easy Bank Account Summary II
1590 Medium Make Sum Divisible by P
1593 Medium Split a String Into the Max Number of Unique Substrings
1598 Easy Crawler Log Folder
1600 Medium Throne Inheritance
1601 Hard Maximum Number of Achievable Transfer Requests
1603 Easy Design Parking System
1605 Medium Find Valid Matrix Given Row and Column Sums
1608 Easy Special Array With X Elements Greater Than or Equal X
1609 Medium Even Odd Tree
1611 Hard Minimum One Bit Operations to Make Integers Zero
1614 Easy Maximum Nesting Depth of the Parentheses
1615 Medium Maximal Network Rank
1624 Easy Largest Substring Between Two Equal Characters
1625 Medium Lexicographically Smallest String After Applying Operations
1626 Medium Best Team With No Conflicts
1630 Medium Arithmetic Subarrays
1631 Medium Path With Minimum Effort
1633 Easy Percentage of Users Attended a Contest
1636 Easy Sort Array by Increasing Frequency
1637 Medium Widest Vertical Area Between Two Points Containing No Points
1638 Medium Count Substrings That Differ by One Character
1639 Hard Number of Ways to Form a Target String Given a Dictionary
1641 Medium Count Sorted Vowel Strings
1642 Medium Furthest Building You Can Reach
1646 Easy Get Maximum in Generated Array
1647 Medium Minimum Deletions to Make Character Frequencies Unique
1652 Easy Defuse the Bomb
1653 Medium Minimum Deletions to Make String Balanced
1657 Medium Determine if Two Strings Are Close
1658 Medium Minimum Operations to Reduce X to Zero
1661 Easy Average Time of Process per Machine
1662 Easy Check If Two String Arrays are Equivalent
1663 Medium Smallest String With A Given Numeric Value
1664 Medium Ways to Make a Fair Array
1667 Easy Fix Names in a Table
1669 Medium Merge In Between Linked Lists
1670 Medium Design Front Middle Back Queue
1671 Hard Minimum Number of Removals to Make Mountain Array
1672 Easy Richest Customer Wealth
1673 Medium Find the Most Competitive Subsequence
1675 Hard Minimize Deviation in Array
1678 Easy Goal Parser Interpretation
1679 Medium Max Number of K-Sum Pairs
1680 Medium Concatenation of Consecutive Binary Numbers
1683 Easy Invalid Tweets
1684 Easy Count the Number of Consistent Strings
1685 Medium Sum of Absolute Differences in a Sorted Array
1686 Medium Stone Game VI
1688 Easy Count of Matches in Tournament
1689 Medium Partitioning Into Minimum Number Of Deci-Binary Numbers
1690 Medium Stone Game VII
1693 Easy Daily Leads and Partners
1695 Medium Maximum Erasure Value
1696 Medium Jump Game VI
1697 Hard Checking Existence of Edge Length Limited Paths
1700 Easy Number of Students Unable to Eat Lunch
1701 Medium Average Waiting Time
1704 Easy Determine if String Halves Are Alike
1706 Medium Where Will the Ball Fall
1716 Easy Calculate Money in Leetcode Bank
1717 Medium Maximum Score From Removing Substrings
1718 Medium Construct the Lexicographically Largest Valid Sequence
1720 Easy Decode XORed Array
1721 Medium Swapping Nodes in a Linked List
1722 Medium Minimize Hamming Distance After Swap Operations
1726 Medium Tuple with Same Product
1727 Medium Largest Submatrix With Rearrangements
1729 Easy Find Followers Count
1731 Easy The Number of Employees Which Report to Each Employee
1732 Easy Find the Highest Altitude
1734 Medium Decode XORed Permutation
1738 Medium Find Kth Largest XOR Coordinate Value
1741 Easy Find Total Time Spent by Each Employee
1743 Medium Restore the Array From Adjacent Pairs
1749 Medium Maximum Absolute Sum of Any Subarray
1750 Medium Minimum Length of String After Deleting Similar Ends
1751 Hard Maximum Number of Events That Can Be Attended II
1753 Medium Maximum Score From Removing Stones
1754 Medium Largest Merge Of Two Strings
1757 Easy Recyclable and Low Fat Products
1758 Easy Minimum Changes To Make Alternating Binary String
1759 Medium Count Number of Homogenous Substrings
1760 Medium Minimum Limit of Balls in a Bag
1764 Medium Form Array by Concatenating Subarrays of Another Array
1765 Medium Map of Highest Peak
1768 Easy Merge Strings Alternately
1769 Medium Minimum Number of Operations to Move All Balls to Each Box
1775 Medium Equal Sum Arrays With Minimum Number of Operations
1780 Medium Check if Number is a Sum of Powers of Three
1781 Medium Sum of Beauty of All Substrings
1786 Medium Number of Restricted Paths From First to Last Node
1789 Easy Primary Department for Each Employee
1791 Easy Find Center of Star Graph
1792 Medium Maximum Average Pass Ratio
1793 Hard Maximum Score of a Good Subarray
1795 Easy Rearrange Products Table
1797 Medium Design Authentication Manager
1798 Medium Maximum Number of Consecutive Values You Can Make
1799 Medium Maximize Score After N Operations
1801 Medium Number of Orders in the Backlog
1802 Medium Maximum Value at a Given Index in a Bounded Array
1806 Medium Minimum Number of Operations to Reinitialize a Permutation
1807 Medium Evaluate the Bracket Pairs of a String
1813 Medium Sentence Similarity III
1814 Medium Count Nice Pairs in an Array
1817 Medium Finding the Users Active Minutes
1822 Easy Sign of the Product of an Array
1823 Medium Find the Winner of the Circular Game
1824 Medium Minimum Sideway Jumps
1828 Medium Queries on Number of Points Inside a Circle
1829 Medium Maximum XOR for Each Query
1833 Medium Maximum Ice Cream Bars
1834 Medium Single-Threaded CPU
1835 Hard Find XOR Sum of All Pairs Bitwise AND
1838 Medium Frequency of the Most Frequent Element
1839 Medium Longest Substring Of All Vowels in Order
1845 Medium Seat Reservation Manager
1846 Medium Maximum Element After Decreasing and Rearranging
1850 Medium Minimum Adjacent Swaps to Reach the Kth Smallest Number
1855 Medium Maximum Distance Between a Pair of Values
1857 Hard Largest Color Value in a Directed Graph
1860 Medium Incremental Memory Leak
1861 Medium Rotating the Box
1863 Easy Sum of All Subset XOR Totals
1865 Medium Finding Pairs With a Certain Sum
1870 Medium Minimum Speed to Arrive on Time
1873 Easy Calculate Special Bonus
1877 Medium Minimize Maximum Pair Sum in Array
1884 Medium Egg Drop With 2 Eggs and N Floors
1887 Medium Reduction Operations to Make the Array Elements Equal
1890 Easy The Latest Login in 2020
1894 Medium Find the Student that Will Replace the Chalk
1895 Medium Largest Magic Square
1897 Easy Redistribute Characters to Make All Strings Equal
1899 Medium Merge Triplets to Form Target Triplet
1901 Medium Find a Peak Element II
1903 Easy Largest Odd Number in String
1905 Medium Count Sub Islands
1907 Medium Count Salary Categories
1910 Medium Remove All Occurrences of a Substring
1911 Medium Maximum Alternating Subsequence Sum
1913 Easy Maximum Product Difference Between Two Pairs
1914 Medium Cyclically Rotating a Grid
1915 Medium Number of Wonderful Substrings
1920 Easy Build Array from Permutation
1921 Medium Eliminate Maximum Number of Monsters
1926 Medium Nearest Exit from Entrance in Maze
1929 Easy Concatenation of Array
1930 Medium Unique Length-3 Palindromic Subsequences
1934 Medium Confirmation Rate
1937 Medium Maximum Number of Points with Cost
1942 Medium The Number of the Smallest Unoccupied Chair
1943 Medium Describe the Painting
1944 Hard Number of Visible People in a Queue
1945 Easy Sum of Digits of String After Convert
1947 Medium Maximum Compatibility Score Sum
1954 Medium Minimum Garden Perimeter to Collect Enough Apples
1957 Easy Delete Characters to Make Fancy String
1962 Medium Remove Stones to Minimize the Total
1963 Medium Minimum Number of Swaps to Make the String Balanced
1964 Hard Find the Longest Valid Obstacle Course at Each Position
1965 Easy Employees With Missing Information
1970 Hard Last Day Where You Can Still Cross
1971 Easy Find if Path Exists in Graph
1975 Medium Maximum Matrix Sum
1976 Medium Number of Ways to Arrive at Destination
1978 Easy Employees Whose Manager Left the Company
1980 Medium Find Unique Binary String
1991 Easy Find the Middle Index in Array
1992 Medium Find All Groups of Farmland
2000 Easy Reverse Prefix of Word
2001 Medium Number of Pairs of Interchangeable Rectangles
2002 Medium Maximum Product of the Length of Two Palindromic Subsequences
2009 Hard Minimum Number of Operations to Make Array Continuous
2011 Easy Final Value of Variable After Performing Operations
2013 Medium Detect Squares
2022 Easy Convert 1D Array Into 2D Array
2023 Medium Number of Pairs of Strings With Concatenation Equal to Target
2024 Medium Maximize the Confusion of an Exam
2028 Medium Find Missing Observations
2033 Medium Minimum Operations to Make a Uni-Value Grid
2037 Easy Minimum Number of Moves to Seat Everyone
2038 Medium Remove Colored Pieces if Both Neighbors are the Same Color
2039 Medium The Time When the Network Becomes Idle
2043 Medium Simple Bank System
2044 Medium Count Number of Maximum Bitwise-OR Subsets
2045 Hard Second Minimum Time to Reach Destination
2049 Medium Count Nodes With the Highest Score
2050 Hard Parallel Courses III
2053 Easy Kth Distinct String in an Array
2054 Medium Two Best Non-Overlapping Events
2058 Medium Find the Minimum and Maximum Number of Nodes Between Critical Points
2059 Medium Minimum Operations to Convert Number
2063 Medium Vowels of All Substrings
2064 Medium Minimized Maximum of Products Distributed to Any Store
2070 Medium Most Beautiful Item for Each Query
2073 Easy Time Needed to Buy Tickets
2074 Medium Reverse Nodes in Even Length Groups
2075 Medium Decode the Slanted Ciphertext
2079 Medium Watering Plants
2080 Medium Range Frequency Queries
2085 Easy Count Common Words With One Occurrence
2087 Medium Minimum Cost Homecoming of a Robot in a Grid
2090 Medium K Radius Subarray Averages
2091 Medium Removing Minimum and Maximum From Array
2092 Hard Find All People With Secret
2095 Medium Delete the Middle Node of a Linked List
2096 Medium Step-By-Step Directions From a Binary Tree Node to Another
2097 Hard Valid Arrangement of Pairs
2100 Medium Find Good Days to Rob the Bank
2101 Medium Detonate the Maximum Bombs
2102 Hard Sequentially Ordinal Rank Tracker
2104 Medium Sum of Subarray Ranges
2108 Easy Find First Palindromic String in the Array
2109 Medium Adding Spaces to a String
2110 Medium Number of Smooth Descent Periods of a Stock
2114 Easy Maximum Number of Words Found in Sentences
2115 Medium Find All Possible Recipes from Given Supplies
2120 Medium Execution of All Suffix Instructions Staying in a Grid
2125 Medium Number of Laser Beams in a Bank
2126 Medium Destroying Asteroids
2130 Medium Maximum Twin Sum of a Linked List
2131 Medium Longest Palindrome by Concatenating Two Letter Words
2134 Medium Minimum Swaps to Group All 1's Together II
2136 Hard Earliest Possible Day of Full Bloom
2139 Medium Minimum Moves to Reach Target Score
2140 Medium Solving Questions With Brainpower
2141 Hard Maximum Running Time of N Computers
2147 Hard Number of Ways to Divide a Long Corridor
2149 Medium Rearrange Array Elements by Sign
2150 Medium Find All Lonely Numbers in the Array
2155 Medium All Divisions With the Highest Score of a Binary Array
2160 Easy Minimum Sum of Four Digit Number After Splitting Digits
2161 Medium Partition Array According to Given Pivot
2165 Medium Smallest Value of the Rearranged Number
2177 Medium Find Three Consecutive Integers That Sum to a Given Number
2178 Medium Maximum Split of Positive Even Integers
2181 Medium Merge Nodes in Between Zeros
2182 Medium Construct String With Repeat Limit
2186 Medium Minimum Number of Steps to Make Two Strings Anagram II
2187 Medium Minimum Time to Complete Trips
2191 Medium Sort the Jumbled Numbers
2192 Medium All Ancestors of a Node in a Directed Acyclic Graph
2196 Medium Create Binary Tree From Descriptions
2201 Medium Count Artifacts That Can Be Extracted
2212 Medium Maximum Points in an Archery Competition
2215 Easy Find the Difference of Two Arrays
2218 Hard Maximum Value of K Coins From Piles
2220 Easy Minimum Bit Flips to Convert Number
2221 Medium Find Triangular Sum of an Array
2222 Medium Number of Ways to Select Buildings
2225 Medium Find Players With Zero or One Losses
2232 Medium Minimize Result by Adding Parentheses to Expression
2235 Easy Add Two Integers
2236 Easy Root Equals Sum of Children
2240 Medium Number of Ways to Buy Pens and Pencils
2243 Easy Calculate Digit Sum of a String
2244 Medium Minimum Rounds to Complete All Tasks
2246 Hard Longest Path With Different Adjacent Characters
2249 Medium Count Lattice Points Inside a Circle
2251 Hard Number of Flowers in Full Bloom
2257 Medium Count Unguarded Cells in the Grid
2260 Medium Minimum Consecutive Cards to Pick Up
2264 Easy Largest 3-Same-Digit Number in String
2265 Medium Count Nodes Equal to Average of Subtree
2265 Medium Count Nodes Equal to Average of Subtree
2272 Hard Substring With Largest Variance
2274 Medium Maximum Consecutive Floors Without Special Floors
2275 Medium Largest Combination With Bitwise AND Greater Than Zero
2279 Medium Maximum Bags With Full Capacity of Rocks
2284 Medium Sender With Largest Word Count
2285 Medium Maximum Total Importance of Roads
2290 Hard Minimum Obstacle Removal to Reach Corner
2294 Medium Partition Array Such That Maximum Difference Is K
2295 Medium Replace Elements in an Array
2300 Medium Successful Pairs of Spells and Potions
2304 Medium Minimum Path Cost in a Grid
2305 Medium Fair Distribution of Cookies
2306 Hard Naming a Company
2316 Medium Count Unreachable Pairs of Nodes in an Undirected Graph
2317 Medium Maximum XOR After Operations
2326 Medium Spiral Matrix IV
2328 Hard Number of Increasing Paths in a Grid
2331 Easy Evaluate Boolean Binary Tree
2336 Medium Smallest Number in Infinite Set
2337 Medium Move Pieces to Obtain a String
2342 Medium Max Sum of a Pair With Equal Sum of Digits
2343 Medium Query Kth Smallest Trimmed Number
2348 Medium Number of Zero-Filled Subarrays
2352 Medium Equal Row and Column Pairs
2353 Medium Design a Food Rating System
2356 Easy Number of Unique Subjects Taught by Each Teacher
2358 Medium Maximum Number of Groups Entering a Competition
2359 Medium Find Closest Node to Given Two Nodes
2360 Hard Longest Cycle in a Graph
2365 Medium Task Scheduler II
2366 Hard Minimum Replacements to Sort the Array
2368 Medium Reachable Nodes With Restrictions
2369 Medium Check if There is a Valid Partition For The Array
2370 Medium Longest Ideal Subsequence
2373 Easy Largest Local Values in a Matrix
2374 Medium Node With Highest Edge Score
2375 Medium Construct Smallest Number From DI String
2380 Medium Time Needed to Rearrange a Binary String
2385 Medium Amount of Time for Binary Tree to Be Infected
2390 Medium Removing Stars From a String
2391 Medium Minimum Amount of Time to Collect Garbage
2392 Hard Build a Matrix With Conditions
2396 Medium Strictly Palindromic Number
2397 Medium Maximum Rows Covered by Columns
2401 Medium Longest Nice Subarray
2402 Hard Meeting Rooms III
2405 Medium Optimal Partition of String
2406 Medium Divide Intervals Into Minimum Number of Groups
2410 Medium Maximum Matching of Players With Trainers
2413 Easy Smallest Even Multiple
2414 Medium Length of the Longest Alphabetical Continuous Substring
2415 Medium Reverse Odd Levels of Binary Tree
2416 Hard Sum of Prefix Scores of Strings
2418 Easy Sort the People
2419 Medium Longest Subarray With Maximum Bitwise AND
2421 Medium Number of Good Paths
2423 Easy Remove Letter To Equalize Frequency
2424 Medium Longest Uploaded Prefix
2425 Medium Bitwise XOR of All Pairings
2428 Medium Maximum Sum of an Hourglass
2433 Medium Find The Original Array of Prefix Xor
2439 Medium Minimize Maximum of Array
2441 Easy Largest Positive Integer That Exists With Its Negative
2442 Medium Count Number of Distinct Integers After Reverse Operations
2444 Hard Count Subarrays With Fixed Bounds
2448 Hard Minimum Cost to Make Array Equal
2452 Medium Words Within Two Edits of Dictionary
2458 Hard Height of Binary Tree After Subtree Removal Queries
2461 Medium Maximum Sum of Distinct Subarrays With Length K
2462 Medium Total Cost to Hire K Workers
2463 Medium Minimum Total Distance Traveled
2465 Easy Number of Distinct Averages
2466 Medium Count Ways To Build Good Strings
2467 Medium Most Profitable Path in a Tree
2469 Easy Convert the Temperature
2471 Medium Minimum Number of Operations to Sort a Binary Tree by Level
2477 Medium Minimum Fuel Cost to Report to the Capital
2482 Medium Difference Between Ones and Zeros in Row and Column
2483 Medium Minimum Penalty for a Shop
2485 Easy Find the Pivot Integer
2486 Medium Append Characters to String to Make Subsequence
2487 Medium Remove Nodes From Linked List
2490 Easy Circular Sentence
2491 Medium Divide Players Into Teams of Equal Skill
2492 Medium Minimum Score of a Path Between Two Cities
2497 Medium Maximum Star Sum of a Graph
2498 Medium Frog Jump II
2501 Medium Longest Square Streak in an Array
2516 Medium Take K of Each Character From Left and Right
2517 Medium Maximum Tastiness of Candy Basket
2526 Medium Find Consecutive Integers from a Data Stream
2527 Medium Find Xor-Beauty of Array
2530 Medium Maximal Score After Applying K Operations
2536 Medium Increment Submatrices by One
2537 Medium Count the Number of Good Subarrays
2540 Easy Minimum Common Value
2542 Medium Maximum Subsequence Score
2545 Medium Sort the Students by Their Kth Score
2551 Hard Put Marbles in Bags
2554 Medium Maximum Number of Integers to Choose From a Range I
2558 Easy Take Gifts From the Richest Pile
2559 Medium Count Vowel Strings in Ranges
2563 Medium Count the Number of Fair Pairs
2568 Medium Minimum Impossible OR
2571 Medium Minimum Operations to Reduce an Integer to 0
2574 Easy Left and Right Sum Differences
2577 Hard Minimum Time to Visit a Cell In a Grid
2579 Medium Count Total Number of Colored Cells
2582 Easy Pass the Pillow
2583 Medium Kth Largest Sum in a Binary Tree
2588 Medium Count the Number of Beautiful Subarrays
2592 Medium Maximize Greatness of an Array
2593 Medium Find Score of an Array After Marking All Elements
2596 Medium Check Knight Tour Configuration
2597 Medium The Number of Beautiful Subsets
2601 Medium Prime Subtraction Operation
2606 Medium Find the Substring With Maximum Cost
2610 Medium Convert an Array Into a 2D Array With Conditions
2616 Medium Minimize the Maximum Difference of Pairs
2620 Easy Counter
2621 Easy Sleep
2622 Medium Cache With Time Limit
2623 Medium Memoize
2626 Easy Array Reduce Transformation
2627 Medium Debounce
2629 Easy Function Composition
2632 Medium Curry
2634 Easy Filter Elements from Array
2635 Easy Apply Transform Over Each Element in Array
2636 Medium Promise Pool
2637 Easy Promise Time Limit
2640 Medium Find the Score of All Prefixes of an Array
2641 Medium Cousins in Binary Tree II
2642 Hard Design Graph With Shortest Path Calculator
2645 Medium Minimum Additions to Make Valid String
2657 Medium Find the Prefix Common Array of Two Arrays
2658 Medium Maximum Number of Fish in a Grid
2661 Medium First Completely Painted Row or Column
2665 Easy Counter II
2666 Easy Allow One Function Call
2667 Easy Create Hello World Function
2672 Medium Number of Adjacent Elements With the Same Color
2673 Medium Make Costs of Paths Equal in a Binary Tree
2676 Medium Throttle
2678 Easy Number of Senior Citizens
2679 Medium Sum in a Matrix
2683 Medium Neighboring Bitwise XOR
2684 Medium Maximum Number of Moves in a Grid
2685 Medium Count the Number of Complete Components
2696 Easy Minimum String Length After Removing Substrings
2698 Medium Find the Punishment Number of an Integer
2699 Hard Modify Graph Edge Weights
2706 Easy Buy Two Chocolates
2707 Medium Extra Characters in a String
2709 Hard Greatest Common Divisor Traversal
2711 Medium Difference of Number of Distinct Values on Diagonals
2712 Medium Minimum Cost to Make All Characters Equal
2740 Medium Find the Value of the Partition
2742 Hard Painting the Walls
2745 Medium Construct the Longest New String
2751 Hard Robot Collisions
2762 Medium Continuous Subarrays
2766 Medium Relocate Marbles
2767 Medium Partition String Into Minimum Beautiful Substrings
2769 Easy Find the Maximum Achievable Number
2779 Medium Maximum Beauty of an Array After Applying Operation
2780 Medium Minimum Index of a Valid Split
2785 Medium Sort Vowels in a String
2798 Easy Number of Employees Who Met the Target
2799 Medium Count Complete Subarrays in an Array
2807 Medium Insert Greatest Common Divisors in Linked List
2812 Medium Find the Safest Path in a Grid
2816 Medium Double a Number Represented as a Linked List
2824 Easy Count Pairs Whose Sum is Less than Target
2825 Medium Make String a Subsequence Using Cyclic Increments
2840 Medium Check if Strings Can be Made Equal With Operations II
2849 Medium Determine if a Cell Is Reachable at a Given Time
2856 Medium Minimum Array Length After Pair Removals
2859 Easy Sum of Values at Indices With K Set Bits
2860 Medium Happy Students
2864 Easy Maximum Odd Binary Number
2870 Medium Minimum Number of Operations to Make Array Empty
2872 Hard Maximum Number of K-Divisible Components
2894 Easy Divisible and Non-divisible Sums Difference
2895 Medium Minimum Processing Time
2900 Medium Longest Unequal Adjacent Groups Subsequence I
2909 Medium Minimum Sum of Mountain Triplets II
2914 Medium Minimum Number of Changes to Make Binary String Beautiful
2924 Medium Find Champion II
2931 Hard Maximum Spending After Buying Items
2938 Medium Separate Black and White Balls
2940 Hard Find Building Where Alice and Bob Can Meet
2942 Easy Find Words Containing Character
2947 Medium Count Beautiful Substrings I
2952 Medium Minimum Number of Coins to be Added
2957 Medium Remove Adjacent Almost-Equal Characters
2958 Medium Length of Longest Subarray With at Most K Frequency
2962 Medium Count Subarrays Where Max Element Appears at Least K Times
2966 Medium Divide Array Into Arrays With Max Difference
2971 Medium Find Polygon With the Largest Perimeter
2976 Medium Minimum Cost to Convert String I
2981 Medium Find Longest Special Substring That Occurs Thrice I
2982 Medium Find Longest Special Substring That Occurs Thrice II
2997 Medium Minimum Number of Operations to Make Array XOR Equal to K
3005 Easy Count Elements With Maximum Frequency
3011 Medium Find if Array Can Be Sorted
3015 Medium Count the Number of Houses at a Certain Distance I
3016 Medium Minimum Number of Pushes to Type Word II
3034 Medium Number of Subarrays That Match a Pattern I
3039 Medium Apply Operations to Make String Empty
3043 Medium Find the Length of the Longest Common Prefix
3067 Medium Count Pairs of Connectable Servers in a Weighted Tree Network
3068 Hard Find the Maximum Sum of Node Values
3070 Medium Count Submatrices with Top-Left Element and Sum Less Than k
3075 Medium Maximize Happiness of Selected Children
3080 Medium Mark Elements on Array by Performing Queries
3097 Medium Shortest Subarray With OR at Least K II
3100 Medium Water Bottles II
3101 Medium Count Alternating Subarrays
3106 Medium Lexicographically Smallest String After Operations With Constraint
3110 Easy Score of a String
3111 Medium Minimum Rectangles to Cover Points
3133 Medium Minimum Array End
3137 Medium Minimum Number of Operations to Make Word K-Periodic
3146 Easy Permutation Difference between Two Strings
3152 Medium Special Array II
3159 Medium Find Occurrences of an Element in an Array
3163 Medium String Compression III
3190 Easy Find Minimum Operations to Make All Elements Divisible by Three
3191 Medium Minimum Operations to Make Binary Array Elements Equal to One I
3192 Medium Minimum Operations to Make Binary Array Elements Equal to One II
3195 Medium Find the Minimum Area to Cover All Ones I
3203 Hard Find Minimum Diameter After Merging Two Trees
3211 Medium Generate Binary Strings Without Adjacent Zeros
3212 Medium Count Submatrices With Equal Frequency of X and Y
3217 Medium Delete Nodes From Linked List Present in Array
3218 Medium Minimum Cost for Cutting Cake I
3223 Medium Minimum Length of String After Operations
3227 Medium Vowels Game in a String
3228 Medium Maximum Number of Operations to Move Ones to the End
3239 Medium Minimum Number of Flips to Make Binary Grid Palindromic I
3243 Medium Shortest Distance After Road Addition Queries I
3249 Medium Count the Number of Good Nodes
3254 Medium Find the Power of K-Size Subarrays I
3264 Easy Final Array State After K Multiplication Operations I
3280 Easy Convert Date to Binary
3285 Easy Find Indices of Stable Mountains
3289 Easy The Two Sneaky Numbers of Digitville
3291 Medium Minimum Number of Valid Strings to Form Target I
3310 Medium Remove Methods From Project