Leetcode Solutions

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.

• MST from edge priority queue: Reference implementation
• MST from edge vector: Reference implementation, edges need to be sorted ascending by len
• Matrix BFS/Flood fill Iterative: Reference implementation
• Matrix BFS/Flood fill Recursive: Reference implementation
• Union Find: Fast implementation, all optimization tricks used
• Segment Tree Iterative: Fast implementation, contains tricky bits
• Segment Tree Recursive: Reference implementation, easy to understand
• Dynamic Segment Tree Recursive: Reference implementation, checks range coverage

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