Medium 题目清单

本清单由 scripts/generate_difficulty_readmes.py 根据 dataset/merged_problems.json 生成。

题目数量：1464

编号	题目	分类
0002	Add Two Numbers	Linked List, Math, Recursion
0003	Longest Substring Without Repeating Characters	Hash Table, String, Sliding Window
0005	Longest Palindromic Substring	Two Pointers, String, Dynamic Programming
0006	Zigzag Conversion	String
0007	Reverse Integer	Math
0008	String to Integer (atoi)	String
0011	Container With Most Water	Array, Two Pointers, Greedy
0012	Integer to Roman	Hash Table, Math, String
0015	3Sum	Array, Two Pointers, Sorting
0016	3Sum Closest	Array, Two Pointers, Sorting
0017	Letter Combinations of a Phone Number	Hash Table, String, Backtracking
0018	4Sum	Array, Two Pointers, Sorting
0019	Remove Nth Node From End of List	Linked List, Two Pointers
0022	Generate Parentheses	String, Dynamic Programming, Backtracking
0024	Swap Nodes in Pairs	Linked List, Recursion
0029	Divide Two Integers	Math, Bit Manipulation
0031	Next Permutation	Array, Two Pointers
0033	Search in Rotated Sorted Array	Array, Binary Search
0034	Find First and Last Position of Element in Sorted Array	Array, Binary Search
0036	Valid Sudoku	Array, Hash Table, Matrix
0038	Count and Say	String
0039	Combination Sum	Array, Backtracking
0040	Combination Sum II	Array, Backtracking
0043	Multiply Strings	Math, String, Simulation
0045	Jump Game II	Array, Dynamic Programming, Greedy
0046	Permutations	Array, Backtracking
0047	Permutations II	Array, Backtracking, Sorting
0048	Rotate Image	Array, Math, Matrix
0049	Group Anagrams	Array, Hash Table, String, Sorting
0050	Pow(x, n)	Math, Recursion
0053	Maximum Subarray	Array, Divide and Conquer, Dynamic Programming
0054	Spiral Matrix	Array, Matrix, Simulation
0055	Jump Game	Array, Dynamic Programming, Greedy
0056	Merge Intervals	Array, Sorting
0057	Insert Interval	Array
0059	Spiral Matrix II	Array, Matrix, Simulation
0061	Rotate List	Linked List, Two Pointers
0062	Unique Paths	Math, Dynamic Programming, Combinatorics
0063	Unique Paths II	Array, Dynamic Programming, Matrix
0064	Minimum Path Sum	Array, Dynamic Programming, Matrix
0071	Simplify Path	String, Stack
0072	Edit Distance	String, Dynamic Programming
0073	Set Matrix Zeroes	Array, Hash Table, Matrix
0074	Search a 2D Matrix	Array, Binary Search, Matrix
0075	Sort Colors	Array, Two Pointers, Sorting
0077	Combinations	Backtracking
0078	Subsets	Array, Backtracking, Bit Manipulation
0079	Word Search	Array, String, Backtracking, Depth-First Search, Matrix
0080	Remove Duplicates from Sorted Array II	Array, Two Pointers
0081	Search in Rotated Sorted Array II	Array, Binary Search
0082	Remove Duplicates from Sorted List II	Linked List, Two Pointers
0086	Partition List	Linked List, Two Pointers
0089	Gray Code	Math, Backtracking, Bit Manipulation
0090	Subsets II	Array, Backtracking, Bit Manipulation
0091	Decode Ways	String, Dynamic Programming
0092	Reverse Linked List II	Linked List
0093	Restore IP Addresses	String, Backtracking
0095	Unique Binary Search Trees II	Dynamic Programming, Backtracking, Tree, Binary Search Tree, Binary Tree
0096	Unique Binary Search Trees	Math, Dynamic Programming, Tree, Binary Search Tree, Binary Tree
0097	Interleaving String	String, Dynamic Programming
0098	Validate Binary Search Tree	Tree, Depth-First Search, Binary Search Tree, Binary Tree
0099	Recover Binary Search Tree	Tree, Depth-First Search, Binary Search Tree, Binary Tree
0102	Binary Tree Level Order Traversal	Tree, Breadth-First Search, Binary Tree
0103	Binary Tree Zigzag Level Order Traversal	Tree, Breadth-First Search, Binary Tree
0105	Construct Binary Tree from Preorder and Inorder Traversal	Array, Hash Table, Divide and Conquer, Tree, Binary Tree
0106	Construct Binary Tree from Inorder and Postorder Traversal	Array, Hash Table, Divide and Conquer, Tree, Binary Tree
0107	Binary Tree Level Order Traversal II	Tree, Breadth-First Search, Binary Tree
0109	Convert Sorted List to Binary Search Tree	Linked List, Divide and Conquer, Tree, Binary Search Tree, Binary Tree
0113	Path Sum II	Backtracking, Tree, Depth-First Search, Binary Tree
0114	Flatten Binary Tree to Linked List	Linked List, Stack, Tree, Depth-First Search, Binary Tree
0116	Populating Next Right Pointers in Each Node	Linked List, Tree, Depth-First Search, Breadth-First Search, Binary Tree
0117	Populating Next Right Pointers in Each Node II	Linked List, Tree, Depth-First Search, Breadth-First Search, Binary Tree
0120	Triangle	Array, Dynamic Programming
0122	Best Time to Buy and Sell Stock II	Array, Dynamic Programming, Greedy
0128	Longest Consecutive Sequence	Array, Hash Table, Union Find
0129	Sum Root to Leaf Numbers	Tree, Depth-First Search, Binary Tree
0130	Surrounded Regions	Array, Depth-First Search, Breadth-First Search, Union Find, Matrix
0131	Palindrome Partitioning	String, Dynamic Programming, Backtracking
0133	Clone Graph	Hash Table, Depth-First Search, Breadth-First Search, Graph
0134	Gas Station	Array, Greedy
0137	Single Number II	Array, Bit Manipulation
0138	Copy List with Random Pointer	Hash Table, Linked List
0139	Word Break	Array, Hash Table, String, Dynamic Programming, Trie, Memoization
0142	Linked List Cycle II	Hash Table, Linked List, Two Pointers
0143	Reorder List	Linked List, Two Pointers, Stack, Recursion
0146	LRU Cache	Hash Table, Linked List, Design, Doubly-Linked List
0147	Insertion Sort List	Linked List, Sorting
0148	Sort List	Linked List, Two Pointers, Divide and Conquer, Sorting, Merge Sort
0150	Evaluate Reverse Polish Notation	Array, Math, Stack
0151	Reverse Words in a String	Two Pointers, String
0152	Maximum Product Subarray	Array, Dynamic Programming
0153	Find Minimum in Rotated Sorted Array	Array, Binary Search
0155	Min Stack	Stack, Design
0162	Find Peak Element	Array, Binary Search
0164	Maximum Gap	Array, Sorting, Bucket Sort, Radix Sort
0165	Compare Version Numbers	Two Pointers, String
0166	Fraction to Recurring Decimal	Hash Table, Math, String
0167	Two Sum II - Input Array Is Sorted	Array, Two Pointers, Binary Search
0172	Factorial Trailing Zeroes	Math
0173	Binary Search Tree Iterator	Stack, Tree, Design, Binary Search Tree, Binary Tree, Iterator
0176	Second Highest Salary	Database
0177	Nth Highest Salary	Database
0178	Rank Scores	Database
0179	Largest Number	Array, String, Greedy, Sorting
0180	Consecutive Numbers	Database
0184	Department Highest Salary	Database
0187	Repeated DNA Sequences	Hash Table, String, Bit Manipulation, Sliding Window, Rolling Hash, Hash Function
0189	Rotate Array	Array, Math, Two Pointers
0192	Word Frequency	Shell
0194	Transpose File	Shell
0198	House Robber	Array, Dynamic Programming
0199	Binary Tree Right Side View	Tree, Depth-First Search, Breadth-First Search, Binary Tree
0200	Number of Islands	Array, Depth-First Search, Breadth-First Search, Union Find, Matrix
0201	Bitwise AND of Numbers Range	Bit Manipulation
0204	Count Primes	Array, Math, Enumeration, Number Theory
0207	Course Schedule	Depth-First Search, Breadth-First Search, Graph, Topological Sort
0208	Implement Trie (Prefix Tree)	Hash Table, String, Design, Trie
0209	Minimum Size Subarray Sum	Array, Binary Search, Sliding Window, Prefix Sum
0210	Course Schedule II	Depth-First Search, Breadth-First Search, Graph, Topological Sort
0211	Design Add and Search Words Data Structure	String, Depth-First Search, Design, Trie
0213	House Robber II	Array, Dynamic Programming
0215	Kth Largest Element in an Array	Array, Divide and Conquer, Sorting, Heap (Priority Queue), Quickselect
0216	Combination Sum III	Array, Backtracking
0221	Maximal Square	Array, Dynamic Programming, Matrix
0223	Rectangle Area	Math, Geometry
0227	Basic Calculator II	Math, String, Stack
0229	Majority Element II	Array, Hash Table, Sorting, Counting
0230	Kth Smallest Element in a BST	Tree, Depth-First Search, Binary Search Tree, Binary Tree
0235	Lowest Common Ancestor of a Binary Search Tree	Tree, Depth-First Search, Binary Search Tree, Binary Tree
0236	Lowest Common Ancestor of a Binary Tree	Tree, Depth-First Search, Binary Tree
0237	Delete Node in a Linked List	Linked List
0238	Product of Array Except Self	Array, Prefix Sum
0240	Search a 2D Matrix II	Array, Binary Search, Divide and Conquer, Matrix
0241	Different Ways to Add Parentheses	Math, String, Dynamic Programming, Recursion, Memoization
0260	Single Number III	Array, Bit Manipulation
0264	Ugly Number II	Hash Table, Math, Dynamic Programming, Heap (Priority Queue)
0274	H-Index	Array, Sorting, Counting Sort
0275	H-Index II	Array, Binary Search
0279	Perfect Squares	Math, Dynamic Programming, Breadth-First Search
0284	Peeking Iterator	Array, Design, Iterator
0287	Find the Duplicate Number	Array, Two Pointers, Binary Search, Bit Manipulation
0289	Game of Life	Array, Matrix, Simulation
0299	Bulls and Cows	Hash Table, String, Counting
0300	Longest Increasing Subsequence	Array, Binary Search, Dynamic Programming
0304	Range Sum Query 2D - Immutable	Array, Design, Matrix, Prefix Sum
0306	Additive Number	String, Backtracking
0307	Range Sum Query - Mutable	Array, Design, Binary Indexed Tree, Segment Tree
0309	Best Time to Buy and Sell Stock with Cooldown	Array, Dynamic Programming
0310	Minimum Height Trees	Depth-First Search, Breadth-First Search, Graph, Topological Sort
0313	Super Ugly Number	Array, Math, Dynamic Programming
0316	Remove Duplicate Letters	String, Stack, Greedy, Monotonic Stack
0318	Maximum Product of Word Lengths	Array, String, Bit Manipulation
0319	Bulb Switcher	Math, Brainteaser
0322	Coin Change	Array, Dynamic Programming, Breadth-First Search
0324	Wiggle Sort II	Array, Divide and Conquer, Greedy, Sorting, Quickselect
0328	Odd Even Linked List	Linked List
0331	Verify Preorder Serialization of a Binary Tree	String, Stack, Tree, Binary Tree
0334	Increasing Triplet Subsequence	Array, Greedy
0337	House Robber III	Dynamic Programming, Tree, Depth-First Search, Binary Tree
0341	Flatten Nested List Iterator	Stack, Tree, Depth-First Search, Design, Queue, Iterator
0343	Integer Break	Math, Dynamic Programming
0347	Top K Frequent Elements	Array, Hash Table, Divide and Conquer, Sorting, Heap (Priority Queue), Bucket Sort, Counting, Quickselect
0355	Design Twitter	Hash Table, Linked List, Design, Heap (Priority Queue)
0357	Count Numbers with Unique Digits	Math, Dynamic Programming, Backtracking
0365	Water and Jug Problem	Math, Depth-First Search, Breadth-First Search
0368	Largest Divisible Subset	Array, Math, Dynamic Programming, Sorting
0371	Sum of Two Integers	Math, Bit Manipulation
0372	Super Pow	Math, Divide and Conquer
0373	Find K Pairs with Smallest Sums	Array, Heap (Priority Queue)
0375	Guess Number Higher or Lower II	Math, Dynamic Programming, Game Theory
0376	Wiggle Subsequence	Array, Dynamic Programming, Greedy
0377	Combination Sum IV	Array, Dynamic Programming
0378	Kth Smallest Element in a Sorted Matrix	Array, Binary Search, Sorting, Heap (Priority Queue), Matrix
0380	Insert Delete GetRandom O(1)	Array, Hash Table, Math, Design, Randomized
0382	Linked List Random Node	Linked List, Math, Reservoir Sampling, Randomized
0384	Shuffle an Array	Array, Math, Design, Randomized
0385	Mini Parser	String, Stack, Depth-First Search
0386	Lexicographical Numbers	Depth-First Search, Trie
0388	Longest Absolute File Path	String, Stack, Depth-First Search
0390	Elimination Game	Math, Recursion
0393	UTF-8 Validation	Array, Bit Manipulation
0394	Decode String	String, Stack, Recursion
0395	Longest Substring with At Least K Repeating Characters	Hash Table, String, Divide and Conquer, Sliding Window
0396	Rotate Function	Array, Math, Dynamic Programming
0397	Integer Replacement	Dynamic Programming, Greedy, Bit Manipulation, Memoization
0398	Random Pick Index	Hash Table, Math, Reservoir Sampling, Randomized
0399	Evaluate Division	Array, String, Depth-First Search, Breadth-First Search, Union Find, Graph, Shortest Path
0400	Nth Digit	Math, Binary Search
0402	Remove K Digits	String, Stack, Greedy, Monotonic Stack
0406	Queue Reconstruction by Height	Array, Binary Indexed Tree, Segment Tree, Sorting
0413	Arithmetic Slices	Array, Dynamic Programming, Sliding Window
0416	Partition Equal Subset Sum	Array, Dynamic Programming
0417	Pacific Atlantic Water Flow	Array, Depth-First Search, Breadth-First Search, Matrix
0419	Battleships in a Board	Array, Depth-First Search, Matrix
0421	Maximum XOR of Two Numbers in an Array	Array, Hash Table, Bit Manipulation, Trie
0423	Reconstruct Original Digits from English	Hash Table, Math, String
0424	Longest Repeating Character Replacement	Hash Table, String, Sliding Window
0427	Construct Quad Tree	Array, Divide and Conquer, Tree, Matrix
0429	N-ary Tree Level Order Traversal	Tree, Breadth-First Search
0430	Flatten a Multilevel Doubly Linked List	Linked List, Depth-First Search, Doubly-Linked List
0433	Minimum Genetic Mutation	Hash Table, String, Breadth-First Search
0435	Non-overlapping Intervals	Array, Dynamic Programming, Greedy, Sorting
0437	Path Sum III	Tree, Depth-First Search, Binary Tree
0438	Find All Anagrams in a String	Hash Table, String, Sliding Window
0442	Find All Duplicates in an Array	Array, Hash Table
0443	String Compression	Two Pointers, String
0445	Add Two Numbers II	Linked List, Math, Stack
0447	Number of Boomerangs	Array, Hash Table, Math
0449	Serialize and Deserialize BST	String, Tree, Depth-First Search, Breadth-First Search, Design, Binary Search Tree, Binary Tree
0450	Delete Node in a BST	Tree, Binary Search Tree, Binary Tree
0451	Sort Characters By Frequency	Hash Table, String, Sorting, Heap (Priority Queue), Bucket Sort, Counting
0452	Minimum Number of Arrows to Burst Balloons	Array, Greedy, Sorting
0453	Minimum Moves to Equal Array Elements	Array, Math
0454	4Sum II	Array, Hash Table
0456	132 Pattern	Array, Binary Search, Stack, Monotonic Stack, Ordered Set
0457	Circular Array Loop	Array, Hash Table, Two Pointers
0462	Minimum Moves to Equal Array Elements II	Array, Math, Sorting
0464	Can I Win	Math, Dynamic Programming, Bit Manipulation, Memoization, Game Theory, Bitmask
0467	Unique Substrings in Wraparound String	String, Dynamic Programming
0468	Validate IP Address	String
0470	Implement Rand10() Using Rand7()	Math, Rejection Sampling, Randomized, Probability and Statistics
0473	Matchsticks to Square	Array, Dynamic Programming, Backtracking, Bit Manipulation, Bitmask
0474	Ones and Zeroes	Array, String, Dynamic Programming
0475	Heaters	Array, Two Pointers, Binary Search, Sorting
0477	Total Hamming Distance	Array, Math, Bit Manipulation
0478	Generate Random Point in a Circle	Math, Geometry, Rejection Sampling, Randomized
0481	Magical String	Two Pointers, String
0486	Predict the Winner	Array, Math, Dynamic Programming, Recursion, Game Theory
0491	Non-decreasing Subsequences	Array, Hash Table, Backtracking, Bit Manipulation
0494	Target Sum	Array, Dynamic Programming, Backtracking
0497	Random Point in Non-overlapping Rectangles	Array, Math, Binary Search, Reservoir Sampling, Prefix Sum, Ordered Set, Randomized
0498	Diagonal Traverse	Array, Matrix, Simulation
0503	Next Greater Element II	Array, Stack, Monotonic Stack
0508	Most Frequent Subtree Sum	Hash Table, Tree, Depth-First Search, Binary Tree
0513	Find Bottom Left Tree Value	Tree, Depth-First Search, Breadth-First Search, Binary Tree
0515	Find Largest Value in Each Tree Row	Tree, Depth-First Search, Breadth-First Search, Binary Tree
0516	Longest Palindromic Subsequence	String, Dynamic Programming
0518	Coin Change II	Array, Dynamic Programming
0519	Random Flip Matrix	Hash Table, Math, Reservoir Sampling, Randomized
0522	Longest Uncommon Subsequence II	Array, Hash Table, Two Pointers, String, Sorting
0523	Continuous Subarray Sum	Array, Hash Table, Math, Prefix Sum
0524	Longest Word in Dictionary through Deleting	Array, Two Pointers, String, Sorting
0525	Contiguous Array	Array, Hash Table, Prefix Sum
0526	Beautiful Arrangement	Array, Dynamic Programming, Backtracking, Bit Manipulation, Bitmask
0528	Random Pick with Weight	Array, Math, Binary Search, Prefix Sum, Randomized
0529	Minesweeper	Array, Depth-First Search, Breadth-First Search, Matrix
0532	K-diff Pairs in an Array	Array, Hash Table, Two Pointers, Binary Search, Sorting
0535	Encode and Decode TinyURL	Hash Table, String, Design, Hash Function
0537	Complex Number Multiplication	Math, String, Simulation
0538	Convert BST to Greater Tree	Tree, Depth-First Search, Binary Search Tree, Binary Tree
0539	Minimum Time Difference	Array, Math, String, Sorting
0540	Single Element in a Sorted Array	Array, Binary Search
0542	01 Matrix	Array, Dynamic Programming, Breadth-First Search, Matrix
0547	Number of Provinces	Depth-First Search, Breadth-First Search, Union Find, Graph
0550	Game Play Analysis IV	Database
0553	Optimal Division	Array, Math, Dynamic Programming
0554	Brick Wall	Array, Hash Table
0556	Next Greater Element III	Math, Two Pointers, String
0558	Logical OR of Two Binary Grids Represented as Quad-Trees	Divide and Conquer, Tree
0560	Subarray Sum Equals K	Array, Hash Table, Prefix Sum
0565	Array Nesting	Array, Depth-First Search
0567	Permutation in String	Hash Table, Two Pointers, String, Sliding Window
0570	Managers with at Least 5 Direct Reports	Database
0576	Out of Boundary Paths	Dynamic Programming
0581	Shortest Unsorted Continuous Subarray	Array, Two Pointers, Stack, Greedy, Sorting, Monotonic Stack
0583	Delete Operation for Two Strings	String, Dynamic Programming
0585	Investments in 2016	Database
0592	Fraction Addition and Subtraction	Math, String, Simulation
0593	Valid Square	Math, Geometry
0602	Friend Requests II: Who Has the Most Friends	Database
0606	Construct String from Binary Tree	String, Tree, Depth-First Search, Binary Tree
0608	Tree Node	Database
0609	Find Duplicate File in System	Array, Hash Table, String
0611	Valid Triangle Number	Array, Two Pointers, Binary Search, Greedy, Sorting
0621	Task Scheduler	Array, Hash Table, Greedy, Sorting, Heap (Priority Queue), Counting
0622	Design Circular Queue	Array, Linked List, Design, Queue
0623	Add One Row to Tree	Tree, Depth-First Search, Breadth-First Search, Binary Tree
0624	Maximum Distance in Arrays	Array, Greedy
0626	Exchange Seats	Database
0633	Sum of Square Numbers	Math, Two Pointers, Binary Search
0636	Exclusive Time of Functions	Array, Stack
0638	Shopping Offers	Array, Dynamic Programming, Backtracking, Bit Manipulation, Memoization, Bitmask
0640	Solve the Equation	Math, String, Simulation
0641	Design Circular Deque	Array, Linked List, Design, Queue
0646	Maximum Length of Pair Chain	Array, Dynamic Programming, Greedy, Sorting
0647	Palindromic Substrings	Two Pointers, String, Dynamic Programming
0648	Replace Words	Array, Hash Table, String, Trie
0649	Dota2 Senate	String, Greedy, Queue
0650	2 Keys Keyboard	Math, Dynamic Programming
0652	Find Duplicate Subtrees	Hash Table, Tree, Depth-First Search, Binary Tree
0654	Maximum Binary Tree	Array, Divide and Conquer, Stack, Tree, Monotonic Stack, Binary Tree
0655	Print Binary Tree	Tree, Depth-First Search, Breadth-First Search, Binary Tree
0658	Find K Closest Elements	Array, Two Pointers, Binary Search, Sliding Window, Sorting, Heap (Priority Queue)
0659	Split Array into Consecutive Subsequences	Array, Hash Table, Greedy, Heap (Priority Queue)
0662	Maximum Width of Binary Tree	Tree, Depth-First Search, Breadth-First Search, Binary Tree
0665	Non-decreasing Array	Array
0667	Beautiful Arrangement II	Array, Math
0669	Trim a Binary Search Tree	Tree, Depth-First Search, Binary Search Tree, Binary Tree
0670	Maximum Swap	Math, Greedy
0672	Bulb Switcher II	Math, Bit Manipulation, Depth-First Search, Breadth-First Search
0673	Number of Longest Increasing Subsequence	Array, Dynamic Programming, Binary Indexed Tree, Segment Tree
0676	Implement Magic Dictionary	Hash Table, String, Depth-First Search, Design, Trie
0677	Map Sum Pairs	Hash Table, String, Design, Trie
0678	Valid Parenthesis String	String, Dynamic Programming, Stack, Greedy
0684	Redundant Connection	Depth-First Search, Breadth-First Search, Union Find, Graph
0686	Repeated String Match	String, String Matching
0687	Longest Univalue Path	Tree, Depth-First Search, Binary Tree
0688	Knight Probability in Chessboard	Dynamic Programming
0690	Employee Importance	Array, Hash Table, Tree, Depth-First Search, Breadth-First Search
0692	Top K Frequent Words	Array, Hash Table, String, Trie, Sorting, Heap (Priority Queue), Bucket Sort, Counting
0695	Max Area of Island	Array, Depth-First Search, Breadth-First Search, Union Find, Matrix
0698	Partition to K Equal Sum Subsets	Array, Dynamic Programming, Backtracking, Bit Manipulation, Memoization, Bitmask
0701	Insert into a Binary Search Tree	Tree, Binary Search Tree, Binary Tree
0707	Design Linked List	Linked List, Design
0712	Minimum ASCII Delete Sum for Two Strings	String, Dynamic Programming
0713	Subarray Product Less Than K	Array, Binary Search, Sliding Window, Prefix Sum
0714	Best Time to Buy and Sell Stock with Transaction Fee	Array, Dynamic Programming, Greedy
0718	Maximum Length of Repeated Subarray	Array, Binary Search, Dynamic Programming, Sliding Window, Rolling Hash, Hash Function
0720	Longest Word in Dictionary	Array, Hash Table, String, Trie, Sorting
0721	Accounts Merge	Array, Hash Table, String, Depth-First Search, Breadth-First Search, Union Find, Sorting
0722	Remove Comments	Array, String
0725	Split Linked List in Parts	Linked List
0729	My Calendar I	Array, Binary Search, Design, Segment Tree, Ordered Set
0731	My Calendar II	Array, Binary Search, Design, Segment Tree, Prefix Sum, Ordered Set
0735	Asteroid Collision	Array, Stack, Simulation
0738	Monotone Increasing Digits	Math, Greedy
0739	Daily Temperatures	Array, Stack, Monotonic Stack
0740	Delete and Earn	Array, Hash Table, Dynamic Programming
0743	Network Delay Time	Depth-First Search, Breadth-First Search, Graph, Heap (Priority Queue), Shortest Path
0752	Open the Lock	Array, Hash Table, String, Breadth-First Search
0754	Reach a Number	Math, Binary Search
0756	Pyramid Transition Matrix	Bit Manipulation, Depth-First Search, Breadth-First Search
0763	Partition Labels	Hash Table, Two Pointers, String, Greedy
0764	Largest Plus Sign	Array, Dynamic Programming
0767	Reorganize String	Hash Table, String, Greedy, Sorting, Heap (Priority Queue), Counting
0769	Max Chunks To Make Sorted	Array, Stack, Greedy, Sorting, Monotonic Stack
0775	Global and Local Inversions	Array, Math
0777	Swap Adjacent in LR String	Two Pointers, String
0779	K-th Symbol in Grammar	Math, Bit Manipulation, Recursion
0781	Rabbits in Forest	Array, Hash Table, Math, Greedy
0784	Letter Case Permutation	String, Backtracking, Bit Manipulation
0785	Is Graph Bipartite?	Depth-First Search, Breadth-First Search, Union Find, Graph
0786	K-th Smallest Prime Fraction	Array, Two Pointers, Binary Search, Sorting, Heap (Priority Queue)
0787	Cheapest Flights Within K Stops	Dynamic Programming, Depth-First Search, Breadth-First Search, Graph, Heap (Priority Queue), Shortest Path
0788	Rotated Digits	Math, Dynamic Programming
0789	Escape The Ghosts	Array, Math
0790	Domino and Tromino Tiling	Dynamic Programming
0791	Custom Sort String	Hash Table, String, Sorting
0792	Number of Matching Subsequences	Array, Hash Table, String, Binary Search, Dynamic Programming, Trie, Sorting
0794	Valid Tic-Tac-Toe State	Array, Matrix
0795	Number of Subarrays with Bounded Maximum	Array, Two Pointers
0797	All Paths From Source to Target	Backtracking, Depth-First Search, Breadth-First Search, Graph
0799	Champagne Tower	Dynamic Programming
0802	Find Eventual Safe States	Depth-First Search, Breadth-First Search, Graph, Topological Sort
0807	Max Increase to Keep City Skyline	Array, Greedy, Matrix
0808	Soup Servings	Math, Dynamic Programming, Probability and Statistics
0809	Expressive Words	Array, Two Pointers, String
0811	Subdomain Visit Count	Array, Hash Table, String, Counting
0813	Largest Sum of Averages	Array, Dynamic Programming, Prefix Sum
0814	Binary Tree Pruning	Tree, Depth-First Search, Binary Tree
0816	Ambiguous Coordinates	String, Backtracking, Enumeration
0817	Linked List Components	Array, Hash Table, Linked List
0820	Short Encoding of Words	Array, Hash Table, String, Trie
0822	Card Flipping Game	Array, Hash Table
0823	Binary Trees With Factors	Array, Hash Table, Dynamic Programming, Sorting
0825	Friends Of Appropriate Ages	Array, Two Pointers, Binary Search, Sorting
0826	Most Profit Assigning Work	Array, Two Pointers, Binary Search, Greedy, Sorting
0831	Masking Personal Information	String
0833	Find And Replace in String	Array, Hash Table, String, Sorting
0835	Image Overlap	Array, Matrix
0837	New 21 Game	Math, Dynamic Programming, Sliding Window, Probability and Statistics
0838	Push Dominoes	Two Pointers, String, Dynamic Programming
0840	Magic Squares In Grid	Array, Hash Table, Math, Matrix
0841	Keys and Rooms	Depth-First Search, Breadth-First Search, Graph
0842	Split Array into Fibonacci Sequence	String, Backtracking
0845	Longest Mountain in Array	Array, Two Pointers, Dynamic Programming, Enumeration
0846	Hand of Straights	Array, Hash Table, Greedy, Sorting
0848	Shifting Letters	Array, String, Prefix Sum
0849	Maximize Distance to Closest Person	Array
0851	Loud and Rich	Array, Depth-First Search, Graph, Topological Sort
0852	Peak Index in a Mountain Array	Array, Binary Search
0853	Car Fleet	Array, Stack, Sorting, Monotonic Stack
0855	Exam Room	Design, Heap (Priority Queue), Ordered Set
0856	Score of Parentheses	String, Stack
0858	Mirror Reflection	Math, Geometry, Number Theory
0861	Score After Flipping Matrix	Array, Greedy, Bit Manipulation, Matrix
0863	All Nodes Distance K in Binary Tree	Hash Table, Tree, Depth-First Search, Breadth-First Search, Binary Tree
0865	Smallest Subtree with all the Deepest Nodes	Hash Table, Tree, Depth-First Search, Breadth-First Search, Binary Tree
0866	Prime Palindrome	Math, Number Theory
0869	Reordered Power of 2	Hash Table, Math, Sorting, Counting, Enumeration
0870	Advantage Shuffle	Array, Two Pointers, Greedy, Sorting
0873	Length of Longest Fibonacci Subsequence	Array, Hash Table, Dynamic Programming
0874	Walking Robot Simulation	Array, Hash Table, Simulation
0875	Koko Eating Bananas	Array, Binary Search
0877	Stone Game	Array, Math, Dynamic Programming, Game Theory
0880	Decoded String at Index	String, Stack
0881	Boats to Save People	Array, Two Pointers, Greedy, Sorting
0885	Spiral Matrix III	Array, Matrix, Simulation
0886	Possible Bipartition	Depth-First Search, Breadth-First Search, Union Find, Graph
0889	Construct Binary Tree from Preorder and Postorder Traversal	Array, Hash Table, Divide and Conquer, Tree, Binary Tree
0890	Find and Replace Pattern	Array, Hash Table, String
0893	Groups of Special-Equivalent Strings	Array, Hash Table, String, Sorting
0894	All Possible Full Binary Trees	Dynamic Programming, Tree, Recursion, Memoization, Binary Tree
0898	Bitwise ORs of Subarrays	Array, Dynamic Programming, Bit Manipulation
0900	RLE Iterator	Array, Design, Counting, Iterator
0901	Online Stock Span	Stack, Design, Monotonic Stack, Data Stream
0904	Fruit Into Baskets	Array, Hash Table, Sliding Window
0907	Sum of Subarray Minimums	Array, Dynamic Programming, Stack, Monotonic Stack
0909	Snakes and Ladders	Array, Breadth-First Search, Matrix
0910	Smallest Range II	Array, Math, Greedy, Sorting
0911	Online Election	Array, Hash Table, Binary Search, Design
0912	Sort an Array	Array, Divide and Conquer, Sorting, Heap (Priority Queue), Merge Sort, Bucket Sort, Radix Sort, Counting Sort
0915	Partition Array into Disjoint Intervals	Array
0916	Word Subsets	Array, Hash Table, String
0918	Maximum Sum Circular Subarray	Array, Divide and Conquer, Dynamic Programming, Queue, Monotonic Queue
0919	Complete Binary Tree Inserter	Tree, Breadth-First Search, Design, Binary Tree
0921	Minimum Add to Make Parentheses Valid	String, Stack, Greedy
0923	3Sum With Multiplicity	Array, Hash Table, Two Pointers, Sorting, Counting
0926	Flip String to Monotone Increasing	String, Dynamic Programming
0930	Binary Subarrays With Sum	Array, Hash Table, Sliding Window, Prefix Sum
0931	Minimum Falling Path Sum	Array, Dynamic Programming, Matrix
0932	Beautiful Array	Array, Math, Divide and Conquer
0934	Shortest Bridge	Array, Depth-First Search, Breadth-First Search, Matrix
0935	Knight Dialer	Dynamic Programming
0937	Reorder Data in Log Files	Array, String, Sorting
0939	Minimum Area Rectangle	Array, Hash Table, Math, Geometry, Sorting
0945	Minimum Increment to Make Array Unique	Array, Greedy, Sorting, Counting
0946	Validate Stack Sequences	Array, Stack, Simulation
0947	Most Stones Removed with Same Row or Column	Hash Table, Depth-First Search, Union Find, Graph
0948	Bag of Tokens	Array, Two Pointers, Greedy, Sorting
0949	Largest Time for Given Digits	Array, String, Backtracking, Enumeration
0950	Reveal Cards In Increasing Order	Array, Queue, Sorting, Simulation
0951	Flip Equivalent Binary Trees	Tree, Depth-First Search, Binary Tree
0954	Array of Doubled Pairs	Array, Hash Table, Greedy, Sorting
0955	Delete Columns to Make Sorted II	Array, String, Greedy
0957	Prison Cells After N Days	Array, Hash Table, Math, Bit Manipulation
0958	Check Completeness of a Binary Tree	Tree, Breadth-First Search, Binary Tree
0959	Regions Cut By Slashes	Array, Hash Table, Depth-First Search, Breadth-First Search, Union Find, Matrix
0962	Maximum Width Ramp	Array, Two Pointers, Stack, Monotonic Stack
0963	Minimum Area Rectangle II	Array, Hash Table, Math, Geometry
0966	Vowel Spellchecker	Array, Hash Table, String
0967	Numbers With Same Consecutive Differences	Backtracking, Breadth-First Search
0969	Pancake Sorting	Array, Two Pointers, Greedy, Sorting
0970	Powerful Integers	Hash Table, Math, Enumeration
0971	Flip Binary Tree To Match Preorder Traversal	Tree, Depth-First Search, Binary Tree
0973	K Closest Points to Origin	Array, Math, Divide and Conquer, Geometry, Sorting, Heap (Priority Queue), Quickselect
0974	Subarray Sums Divisible by K	Array, Hash Table, Prefix Sum
0978	Longest Turbulent Subarray	Array, Dynamic Programming, Sliding Window
0979	Distribute Coins in Binary Tree	Tree, Depth-First Search, Binary Tree
0981	Time Based Key-Value Store	Hash Table, String, Binary Search, Design
0983	Minimum Cost For Tickets	Array, Dynamic Programming
0984	String Without AAA or BBB	String, Greedy
0985	Sum of Even Numbers After Queries	Array, Simulation
0986	Interval List Intersections	Array, Two Pointers, Line Sweep
0988	Smallest String Starting From Leaf	String, Backtracking, Tree, Depth-First Search, Binary Tree
0990	Satisfiability of Equality Equations	Array, String, Union Find, Graph
0991	Broken Calculator	Math, Greedy
0994	Rotting Oranges	Array, Breadth-First Search, Matrix
0998	Maximum Binary Tree II	Tree, Binary Tree
1003	Check If Word Is Valid After Substitutions	String, Stack
1004	Max Consecutive Ones III	Array, Binary Search, Sliding Window, Prefix Sum
1006	Clumsy Factorial	Math, Stack, Simulation
1007	Minimum Domino Rotations For Equal Row	Array, Greedy
1008	Construct Binary Search Tree from Preorder Traversal	Array, Stack, Tree, Binary Search Tree, Monotonic Stack, Binary Tree
1010	Pairs of Songs With Total Durations Divisible by 60	Array, Hash Table, Counting
1011	Capacity To Ship Packages Within D Days	Array, Binary Search
1014	Best Sightseeing Pair	Array, Dynamic Programming
1015	Smallest Integer Divisible by K	Hash Table, Math
1016	Binary String With Substrings Representing 1 To N	Hash Table, String, Bit Manipulation, Sliding Window
1017	Convert to Base -2	Math
1019	Next Greater Node In Linked List	Array, Linked List, Stack, Monotonic Stack
1020	Number of Enclaves	Array, Depth-First Search, Breadth-First Search, Union Find, Matrix
1023	Camelcase Matching	Array, Two Pointers, String, Trie, String Matching
1024	Video Stitching	Array, Dynamic Programming, Greedy
1026	Maximum Difference Between Node and Ancestor	Tree, Depth-First Search, Binary Tree
1027	Longest Arithmetic Subsequence	Array, Hash Table, Binary Search, Dynamic Programming
1029	Two City Scheduling	Array, Greedy, Sorting
1031	Maximum Sum of Two Non-Overlapping Subarrays	Array, Dynamic Programming, Sliding Window
1033	Moving Stones Until Consecutive	Math, Brainteaser
1034	Coloring A Border	Array, Depth-First Search, Breadth-First Search, Matrix
1035	Uncrossed Lines	Array, Dynamic Programming
1038	Binary Search Tree to Greater Sum Tree	Tree, Depth-First Search, Binary Search Tree, Binary Tree
1039	Minimum Score Triangulation of Polygon	Array, Dynamic Programming
1040	Moving Stones Until Consecutive II	Array, Math, Sliding Window, Sorting
1041	Robot Bounded In Circle	Math, String, Simulation
1042	Flower Planting With No Adjacent	Depth-First Search, Breadth-First Search, Graph
1043	Partition Array for Maximum Sum	Array, Dynamic Programming
1045	Customers Who Bought All Products	Database
1048	Longest String Chain	Array, Hash Table, Two Pointers, String, Dynamic Programming, Sorting
1049	Last Stone Weight II	Array, Dynamic Programming
1052	Grumpy Bookstore Owner	Array, Sliding Window
1053	Previous Permutation With One Swap	Array, Greedy
1054	Distant Barcodes	Array, Hash Table, Greedy, Sorting, Heap (Priority Queue), Counting
1061	Lexicographically Smallest Equivalent String	String, Union Find
1070	Product Sales Analysis III	Database
1072	Flip Columns For Maximum Number of Equal Rows	Array, Hash Table, Matrix
1073	Adding Two Negabinary Numbers	Array, Math
1079	Letter Tile Possibilities	Hash Table, String, Backtracking, Counting
1080	Insufficient Nodes in Root to Leaf Paths	Tree, Depth-First Search, Binary Tree
1081	Smallest Subsequence of Distinct Characters	String, Stack, Greedy, Monotonic Stack
1090	Largest Values From Labels	Array, Hash Table, Greedy, Sorting, Counting
1091	Shortest Path in Binary Matrix	Array, Breadth-First Search, Matrix
1093	Statistics from a Large Sample	Array, Math, Probability and Statistics
1094	Car Pooling	Array, Sorting, Heap (Priority Queue), Simulation, Prefix Sum
1104	Path In Zigzag Labelled Binary Tree	Math, Tree, Binary Tree
1105	Filling Bookcase Shelves	Array, Dynamic Programming
1109	Corporate Flight Bookings	Array, Prefix Sum
1110	Delete Nodes And Return Forest	Array, Hash Table, Tree, Depth-First Search, Binary Tree
1111	Maximum Nesting Depth of Two Valid Parentheses Strings	String, Stack
1115	Print FooBar Alternately	Concurrency
1116	Print Zero Even Odd	Concurrency
1117	Building H2O	Concurrency
1123	Lowest Common Ancestor of Deepest Leaves	Hash Table, Tree, Depth-First Search, Breadth-First Search, Binary Tree
1124	Longest Well-Performing Interval	Array, Hash Table, Stack, Monotonic Stack, Prefix Sum
1129	Shortest Path with Alternating Colors	Breadth-First Search, Graph
1130	Minimum Cost Tree From Leaf Values	Array, Dynamic Programming, Stack, Greedy, Monotonic Stack
1131	Maximum of Absolute Value Expression	Array, Math
1138	Alphabet Board Path	Hash Table, String
1139	Largest 1-Bordered Square	Array, Dynamic Programming, Matrix
1140	Stone Game II	Array, Math, Dynamic Programming, Prefix Sum, Game Theory
1143	Longest Common Subsequence	String, Dynamic Programming
1144	Decrease Elements To Make Array Zigzag	Array, Greedy
1145	Binary Tree Coloring Game	Tree, Depth-First Search, Binary Tree
1146	Snapshot Array	Array, Hash Table, Binary Search, Design
1155	Number of Dice Rolls With Target Sum	Dynamic Programming
1156	Swap For Longest Repeated Character Substring	Hash Table, String, Sliding Window
1158	Market Analysis I	Database
1161	Maximum Level Sum of a Binary Tree	Tree, Depth-First Search, Breadth-First Search, Binary Tree
1162	As Far from Land as Possible	Array, Dynamic Programming, Breadth-First Search, Matrix
1164	Product Price at a Given Date	Database
1169	Invalid Transactions	Array, Hash Table, String, Sorting
1170	Compare Strings by Frequency of the Smallest Character	Array, Hash Table, String, Binary Search, Sorting
1171	Remove Zero Sum Consecutive Nodes from Linked List	Hash Table, Linked List
1174	Immediate Food Delivery II	Database
1177	Can Make Palindrome from Substring	Array, Hash Table, String, Bit Manipulation, Prefix Sum
1186	Maximum Subarray Sum with One Deletion	Array, Dynamic Programming
1190	Reverse Substrings Between Each Pair of Parentheses	String, Stack
1191	K-Concatenation Maximum Sum	Array, Dynamic Programming
1193	Monthly Transactions I	Database
1195	Fizz Buzz Multithreaded	Concurrency
1201	Ugly Number III	Math, Binary Search, Combinatorics, Number Theory
1202	Smallest String With Swaps	Array, Hash Table, String, Depth-First Search, Breadth-First Search, Union Find, Sorting
1204	Last Person to Fit in the Bus	Database
1208	Get Equal Substrings Within Budget	String, Binary Search, Sliding Window, Prefix Sum
1209	Remove All Adjacent Duplicates in String II	String, Stack
1218	Longest Arithmetic Subsequence of Given Difference	Array, Hash Table, Dynamic Programming
1219	Path with Maximum Gold	Array, Backtracking, Matrix
1222	Queens That Can Attack the King	Array, Matrix, Simulation
1226	The Dining Philosophers	Concurrency
1227	Airplane Seat Assignment Probability	Math, Dynamic Programming, Brainteaser, Probability and Statistics
1233	Remove Sub-Folders from the Filesystem	Array, String, Depth-First Search, Trie
1234	Replace the Substring for Balanced String	String, Sliding Window
1237	Find Positive Integer Solution for a Given Equation	Math, Two Pointers, Binary Search, Interactive
1238	Circular Permutation in Binary Representation	Math, Backtracking, Bit Manipulation
1239	Maximum Length of a Concatenated String with Unique Characters	Array, String, Backtracking, Bit Manipulation
1247	Minimum Swaps to Make Strings Equal	Math, String, Greedy
1248	Count Number of Nice Subarrays	Array, Hash Table, Math, Sliding Window, Prefix Sum
1249	Minimum Remove to Make Valid Parentheses	String, Stack
1253	Reconstruct a 2-Row Binary Matrix	Array, Greedy, Matrix
1254	Number of Closed Islands	Array, Depth-First Search, Breadth-First Search, Union Find, Matrix
1261	Find Elements in a Contaminated Binary Tree	Hash Table, Tree, Depth-First Search, Breadth-First Search, Design, Binary Tree
1262	Greatest Sum Divisible by Three	Array, Dynamic Programming, Greedy, Sorting
1267	Count Servers that Communicate	Array, Depth-First Search, Breadth-First Search, Union Find, Matrix, Counting
1268	Search Suggestions System	Array, String, Binary Search, Trie, Sorting, Heap (Priority Queue)
1276	Number of Burgers with No Waste of Ingredients	Math
1277	Count Square Submatrices with All Ones	Array, Dynamic Programming, Matrix
1282	Group the People Given the Group Size They Belong To	Array, Hash Table, Greedy
1283	Find the Smallest Divisor Given a Threshold	Array, Binary Search
1286	Iterator for Combination	String, Backtracking, Design, Iterator
1288	Remove Covered Intervals	Array, Sorting
1291	Sequential Digits	Enumeration
1292	Maximum Side Length of a Square with Sum Less than or Equal to Threshold	Array, Binary Search, Matrix, Prefix Sum
1296	Divide Array in Sets of K Consecutive Numbers	Array, Hash Table, Greedy, Sorting
1297	Maximum Number of Occurrences of a Substring	Hash Table, String, Sliding Window
1300	Sum of Mutated Array Closest to Target	Array, Binary Search, Sorting
1302	Deepest Leaves Sum	Tree, Depth-First Search, Breadth-First Search, Binary Tree
1305	All Elements in Two Binary Search Trees	Tree, Depth-First Search, Binary Search Tree, Sorting, Binary Tree
1306	Jump Game III	Array, Depth-First Search, Breadth-First Search
1310	XOR Queries of a Subarray	Array, Bit Manipulation, Prefix Sum
1311	Get Watched Videos by Your Friends	Array, Hash Table, Breadth-First Search, Graph, Sorting
1314	Matrix Block Sum	Array, Matrix, Prefix Sum
1315	Sum of Nodes with Even-Valued Grandparent	Tree, Depth-First Search, Breadth-First Search, Binary Tree
1318	Minimum Flips to Make a OR b Equal to c	Bit Manipulation
1319	Number of Operations to Make Network Connected	Depth-First Search, Breadth-First Search, Union Find, Graph
1321	Restaurant Growth	Database
1324	Print Words Vertically	Array, String, Simulation
1325	Delete Leaves With a Given Value	Tree, Depth-First Search, Binary Tree
1328	Break a Palindrome	String, Greedy
1329	Sort the Matrix Diagonally	Array, Sorting, Matrix
1333	Filter Restaurants by Vegan-Friendly, Price and Distance	Array, Sorting
1334	Find the City With the Smallest Number of Neighbors at a Threshold Distance	Dynamic Programming, Graph, Shortest Path
1338	Reduce Array Size to The Half	Array, Hash Table, Greedy, Sorting, Heap (Priority Queue)
1339	Maximum Product of Splitted Binary Tree	Tree, Depth-First Search, Binary Tree
1341	Movie Rating	Database
1343	Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold	Array, Sliding Window
1344	Angle Between Hands of a Clock	Math
1347	Minimum Number of Steps to Make Two Strings Anagram	Hash Table, String, Counting
1348	Tweet Counts Per Frequency	Hash Table, Binary Search, Design, Sorting, Ordered Set
1352	Product of the Last K Numbers	Array, Math, Design, Data Stream, Prefix Sum
1353	Maximum Number of Events That Can Be Attended	Array, Greedy, Sorting, Heap (Priority Queue)
1357	Apply Discount Every n Orders	Array, Hash Table, Design
1358	Number of Substrings Containing All Three Characters	Hash Table, String, Sliding Window
1361	Validate Binary Tree Nodes	Tree, Depth-First Search, Breadth-First Search, Union Find, Graph, Binary Tree
1362	Closest Divisors	Math
1366	Rank Teams by Votes	Array, Hash Table, String, Sorting, Counting
1367	Linked List in Binary Tree	Linked List, Tree, Depth-First Search, Binary Tree
1371	Find the Longest Substring Containing Vowels in Even Counts	Hash Table, String, Bit Manipulation, Prefix Sum
1372	Longest ZigZag Path in a Binary Tree	Dynamic Programming, Tree, Depth-First Search, Binary Tree
1375	Number of Times Binary String Is Prefix-Aligned	Array
1376	Time Needed to Inform All Employees	Tree, Depth-First Search, Breadth-First Search
1381	Design a Stack With Increment Operation	Array, Stack, Design
1382	Balance a Binary Search Tree	Divide and Conquer, Greedy, Tree, Depth-First Search, Binary Search Tree, Binary Tree
1386	Cinema Seat Allocation	Array, Hash Table, Greedy, Bit Manipulation
1387	Sort Integers by The Power Value	Dynamic Programming, Memoization, Sorting
1390	Four Divisors	Array, Math
1391	Check if There is a Valid Path in a Grid	Array, Depth-First Search, Breadth-First Search, Union Find, Matrix
1393	Capital Gain/Loss	Database
1395	Count Number of Teams	Array, Dynamic Programming, Binary Indexed Tree, Segment Tree
1396	Design Underground System	Hash Table, String, Design
1400	Construct K Palindrome Strings	Hash Table, String, Greedy, Counting
1401	Circle and Rectangle Overlapping	Math, Geometry
1404	Number of Steps to Reduce a Number in Binary Representation to One	String, Bit Manipulation, Simulation
1405	Longest Happy String	String, Greedy, Heap (Priority Queue)
1409	Queries on a Permutation With Key	Array, Binary Indexed Tree, Simulation
1410	HTML Entity Parser	Hash Table, String
1414	Find the Minimum Number of Fibonacci Numbers Whose Sum Is K	Math, Greedy
1415	The k-th Lexicographical String of All Happy Strings of Length n	String, Backtracking
1418	Display Table of Food Orders in a Restaurant	Array, Hash Table, String, Sorting, Ordered Set
1419	Minimum Number of Frogs Croaking	String, Counting
1423	Maximum Points You Can Obtain from Cards	Array, Sliding Window, Prefix Sum
1424	Diagonal Traverse II	Array, Sorting, Heap (Priority Queue)
1432	Max Difference You Can Get From Changing an Integer	Math, Greedy
1433	Check If a String Can Break Another String	String, Greedy, Sorting
1438	Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit	Array, Queue, Sliding Window, Heap (Priority Queue), Ordered Set, Monotonic Queue
1441	Build an Array With Stack Operations	Array, Stack, Simulation
1442	Count Triplets That Can Form Two Arrays of Equal XOR	Array, Hash Table, Math, Bit Manipulation, Prefix Sum
1443	Minimum Time to Collect All Apples in a Tree	Hash Table, Tree, Depth-First Search, Breadth-First Search
1447	Simplified Fractions	Math, String, Number Theory
1448	Count Good Nodes in Binary Tree	Tree, Depth-First Search, Breadth-First Search, Binary Tree
1451	Rearrange Words in a Sentence	String, Sorting
1452	People Whose List of Favorite Companies Is Not a Subset of Another List	Array, Hash Table, String
1456	Maximum Number of Vowels in a Substring of Given Length	String, Sliding Window
1457	Pseudo-Palindromic Paths in a Binary Tree	Bit Manipulation, Tree, Depth-First Search, Breadth-First Search, Binary Tree
1461	Check If a String Contains All Binary Codes of Size K	Hash Table, String, Bit Manipulation, Rolling Hash, Hash Function
1462	Course Schedule IV	Depth-First Search, Breadth-First Search, Graph, Topological Sort
1465	Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts	Array, Greedy, Sorting
1466	Reorder Routes to Make All Paths Lead to the City Zero	Depth-First Search, Breadth-First Search, Graph
1471	The k Strongest Values in an Array	Array, Two Pointers, Sorting
1472	Design Browser History	Array, Linked List, Stack, Design, Doubly-Linked List, Data Stream
1476	Subrectangle Queries	Array, Design, Matrix
1477	Find Two Non-overlapping Sub-arrays Each With Target Sum	Array, Hash Table, Binary Search, Dynamic Programming, Sliding Window
1481	Least Number of Unique Integers after K Removals	Array, Hash Table, Greedy, Sorting, Counting
1482	Minimum Number of Days to Make m Bouquets	Array, Binary Search
1487	Making File Names Unique	Array, Hash Table, String
1488	Avoid Flood in The City	Array, Hash Table, Binary Search, Greedy, Heap (Priority Queue)
1492	The kth Factor of n	Math, Number Theory
1493	Longest Subarray of 1's After Deleting One Element	Array, Dynamic Programming, Sliding Window
1497	Check If Array Pairs Are Divisible by k	Array, Hash Table, Counting
1498	Number of Subsequences That Satisfy the Given Sum Condition	Array, Two Pointers, Binary Search, Sorting
1503	Last Moment Before All Ants Fall Out of a Plank	Array, Brainteaser, Simulation
1504	Count Submatrices With All Ones	Array, Dynamic Programming, Stack, Matrix, Monotonic Stack
1508	Range Sum of Sorted Subarray Sums	Array, Two Pointers, Binary Search, Sorting, Prefix Sum
1509	Minimum Difference Between Largest and Smallest Value in Three Moves	Array, Greedy, Sorting
1513	Number of Substrings With Only 1s	Math, String
1514	Path with Maximum Probability	Array, Graph, Heap (Priority Queue), Shortest Path
1519	Number of Nodes in the Sub-Tree With the Same Label	Hash Table, Tree, Depth-First Search, Breadth-First Search, Counting
1524	Number of Sub-arrays With Odd Sum	Array, Math, Dynamic Programming, Prefix Sum
1525	Number of Good Ways to Split a String	Hash Table, String, Dynamic Programming, Bit Manipulation
1529	Minimum Suffix Flips	String, Greedy
1530	Number of Good Leaf Nodes Pairs	Tree, Depth-First Search, Binary Tree
1535	Find the Winner of an Array Game	Array, Simulation
1536	Minimum Swaps to Arrange a Binary Grid	Array, Greedy, Matrix
1540	Can Convert String in K Moves	Hash Table, String
1541	Minimum Insertions to Balance a Parentheses String	String, Stack, Greedy
1545	Find Kth Bit in Nth Binary String	String, Recursion, Simulation
1546	Maximum Number of Non-Overlapping Subarrays With Sum Equals Target	Array, Hash Table, Greedy, Prefix Sum
1551	Minimum Operations to Make Array Equal	Math
1552	Magnetic Force Between Two Balls	Array, Binary Search, Sorting
1557	Minimum Number of Vertices to Reach All Nodes	Graph
1558	Minimum Numbers of Function Calls to Make Target Array	Array, Greedy, Bit Manipulation
1559	Detect Cycles in 2D Grid	Array, Depth-First Search, Breadth-First Search, Union Find, Matrix
1561	Maximum Number of Coins You Can Get	Array, Math, Greedy, Sorting, Game Theory
1562	Find Latest Group of Size M	Array, Hash Table, Binary Search, Simulation
1567	Maximum Length of Subarray With Positive Product	Array, Dynamic Programming, Greedy
1573	Number of Ways to Split a String	Math, String
1574	Shortest Subarray to be Removed to Make Array Sorted	Array, Two Pointers, Binary Search, Stack, Monotonic Stack
1577	Number of Ways Where Square of Number Is Equal to Product of Two Numbers	Array, Hash Table, Math, Two Pointers
1578	Minimum Time to Make Rope Colorful	Array, String, Dynamic Programming, Greedy
1583	Count Unhappy Friends	Array, Simulation
1584	Min Cost to Connect All Points	Array, Union Find, Graph, Minimum Spanning Tree
1589	Maximum Sum Obtained of Any Permutation	Array, Greedy, Sorting, Prefix Sum
1590	Make Sum Divisible by P	Array, Hash Table, Prefix Sum
1593	Split a String Into the Max Number of Unique Substrings	Hash Table, String, Backtracking
1594	Maximum Non Negative Product in a Matrix	Array, Dynamic Programming, Matrix
1599	Maximum Profit of Operating a Centennial Wheel	Array, Simulation
1600	Throne Inheritance	Hash Table, Tree, Depth-First Search, Design
1604	Alert Using Same Key-Card Three or More Times in a One Hour Period	Array, Hash Table, String, Sorting
1605	Find Valid Matrix Given Row and Column Sums	Array, Greedy, Matrix
1609	Even Odd Tree	Tree, Breadth-First Search, Binary Tree
1615	Maximal Network Rank	Graph
1616	Split Two Strings to Make Palindrome	Two Pointers, String
1620	Coordinate With Maximum Network Quality	Array, Enumeration
1621	Number of Sets of K Non-Overlapping Line Segments	Math, Dynamic Programming, Combinatorics
1625	Lexicographically Smallest String After Applying Operations	String, Depth-First Search, Breadth-First Search, Enumeration
1626	Best Team With No Conflicts	Array, Dynamic Programming, Sorting
1630	Arithmetic Subarrays	Array, Hash Table, Sorting
1631	Path With Minimum Effort	Array, Binary Search, Depth-First Search, Breadth-First Search, Union Find, Heap (Priority Queue), Matrix
1638	Count Substrings That Differ by One Character	Hash Table, String, Dynamic Programming, Enumeration
1641	Count Sorted Vowel Strings	Math, Dynamic Programming, Combinatorics
1642	Furthest Building You Can Reach	Array, Greedy, Heap (Priority Queue)
1647	Minimum Deletions to Make Character Frequencies Unique	Hash Table, String, Greedy, Sorting
1648	Sell Diminishing-Valued Colored Balls	Array, Math, Binary Search, Greedy, Sorting, Heap (Priority Queue)
1653	Minimum Deletions to Make String Balanced	String, Dynamic Programming, Stack
1654	Minimum Jumps to Reach Home	Array, Dynamic Programming, Breadth-First Search
1657	Determine if Two Strings Are Close	Hash Table, String, Sorting, Counting
1658	Minimum Operations to Reduce X to Zero	Array, Hash Table, Binary Search, Sliding Window, Prefix Sum
1663	Smallest String With A Given Numeric Value	String, Greedy
1664	Ways to Make a Fair Array	Array, Prefix Sum
1669	Merge In Between Linked Lists	Linked List
1670	Design Front Middle Back Queue	Array, Linked List, Design, Queue, Data Stream
1673	Find the Most Competitive Subsequence	Array, Stack, Greedy, Monotonic Stack
1674	Minimum Moves to Make Array Complementary	Array, Hash Table, Prefix Sum
1679	Max Number of K-Sum Pairs	Array, Hash Table, Two Pointers, Sorting
1680	Concatenation of Consecutive Binary Numbers	Math, Bit Manipulation, Simulation
1685	Sum of Absolute Differences in a Sorted Array	Array, Math, Prefix Sum
1686	Stone Game VI	Array, Math, Greedy, Sorting, Heap (Priority Queue), Game Theory
1689	Partitioning Into Minimum Number Of Deci-Binary Numbers	String, Greedy
1690	Stone Game VII	Array, Math, Dynamic Programming, Game Theory
1695	Maximum Erasure Value	Array, Hash Table, Sliding Window
1696	Jump Game VI	Array, Dynamic Programming, Queue, Heap (Priority Queue), Monotonic Queue
1701	Average Waiting Time	Array, Simulation
1702	Maximum Binary String After Change	String, Greedy
1705	Maximum Number of Eaten Apples	Array, Greedy, Heap (Priority Queue)
1706	Where Will the Ball Fall	Array, Matrix, Simulation
1711	Count Good Meals	Array, Hash Table
1712	Ways to Split Array Into Three Subarrays	Array, Two Pointers, Binary Search, Prefix Sum
1717	Maximum Score From Removing Substrings	String, Stack, Greedy
1718	Construct the Lexicographically Largest Valid Sequence	Array, Backtracking
1721	Swapping Nodes in a Linked List	Linked List, Two Pointers
1722	Minimize Hamming Distance After Swap Operations	Array, Depth-First Search, Union Find
1726	Tuple with Same Product	Array, Hash Table, Counting
1727	Largest Submatrix With Rearrangements	Array, Greedy, Sorting, Matrix
1733	Minimum Number of People to Teach	Array, Hash Table, Greedy
1734	Decode XORed Permutation	Array, Bit Manipulation
1737	Change Minimum Characters to Satisfy One of Three Conditions	Hash Table, String, Counting, Prefix Sum
1738	Find Kth Largest XOR Coordinate Value	Array, Divide and Conquer, Bit Manipulation, Sorting, Heap (Priority Queue), Matrix, Prefix Sum, Quickselect
1743	Restore the Array From Adjacent Pairs	Array, Hash Table, Depth-First Search
1744	Can You Eat Your Favorite Candy on Your Favorite Day?	Array, Prefix Sum
1749	Maximum Absolute Sum of Any Subarray	Array, Dynamic Programming
1750	Minimum Length of String After Deleting Similar Ends	Two Pointers, String
1753	Maximum Score From Removing Stones	Math, Greedy, Heap (Priority Queue)
1754	Largest Merge Of Two Strings	Two Pointers, String, Greedy
1759	Count Number of Homogenous Substrings	Math, String
1760	Minimum Limit of Balls in a Bag	Array, Binary Search
1764	Form Array by Concatenating Subarrays of Another Array	Array, Two Pointers, Greedy, String Matching
1765	Map of Highest Peak	Array, Breadth-First Search, Matrix
1769	Minimum Number of Operations to Move All Balls to Each Box	Array, String, Prefix Sum
1774	Closest Dessert Cost	Array, Dynamic Programming, Backtracking
1775	Equal Sum Arrays With Minimum Number of Operations	Array, Hash Table, Greedy, Counting
1780	Check if Number is a Sum of Powers of Three	Math
1781	Sum of Beauty of All Substrings	Hash Table, String, Counting
1785	Minimum Elements to Add to Form a Given Sum	Array, Greedy
1786	Number of Restricted Paths From First to Last Node	Dynamic Programming, Graph, Topological Sort, Heap (Priority Queue), Shortest Path
1792	Maximum Average Pass Ratio	Array, Greedy, Heap (Priority Queue)
1797	Design Authentication Manager	Hash Table, Linked List, Design, Doubly-Linked List
1798	Maximum Number of Consecutive Values You Can Make	Array, Greedy, Sorting
1801	Number of Orders in the Backlog	Array, Heap (Priority Queue), Simulation
1802	Maximum Value at a Given Index in a Bounded Array	Math, Binary Search, Greedy
1806	Minimum Number of Operations to Reinitialize a Permutation	Array, Math, Simulation
1807	Evaluate the Bracket Pairs of a String	Array, Hash Table, String
1813	Sentence Similarity III	Array, Two Pointers, String
1814	Count Nice Pairs in an Array	Array, Hash Table, Math, Counting
1817	Finding the Users Active Minutes	Array, Hash Table
1818	Minimum Absolute Sum Difference	Array, Binary Search, Sorting, Ordered Set
1823	Find the Winner of the Circular Game	Array, Math, Recursion, Queue, Simulation
1824	Minimum Sideway Jumps	Array, Dynamic Programming, Greedy
1828	Queries on Number of Points Inside a Circle	Array, Math, Geometry
1829	Maximum XOR for Each Query	Array, Bit Manipulation, Prefix Sum
1833	Maximum Ice Cream Bars	Array, Greedy, Sorting, Counting Sort
1834	Single-Threaded CPU	Array, Sorting, Heap (Priority Queue)
1838	Frequency of the Most Frequent Element	Array, Binary Search, Greedy, Sliding Window, Sorting, Prefix Sum
1839	Longest Substring Of All Vowels in Order	String, Sliding Window
1845	Seat Reservation Manager	Design, Heap (Priority Queue)
1846	Maximum Element After Decreasing and Rearranging	Array, Greedy, Sorting
1849	Splitting a String Into Descending Consecutive Values	String, Backtracking, Enumeration
1850	Minimum Adjacent Swaps to Reach the Kth Smallest Number	Two Pointers, String, Greedy
1855	Maximum Distance Between a Pair of Values	Array, Two Pointers, Binary Search
1856	Maximum Subarray Min-Product	Array, Stack, Monotonic Stack, Prefix Sum
1860	Incremental Memory Leak	Math, Simulation
1861	Rotating the Box	Array, Two Pointers, Matrix
1864	Minimum Number of Swaps to Make the Binary String Alternating	String, Greedy
1865	Finding Pairs With a Certain Sum	Array, Hash Table, Design
1870	Minimum Speed to Arrive on Time	Array, Binary Search
1871	Jump Game VII	String, Dynamic Programming, Sliding Window, Prefix Sum
1877	Minimize Maximum Pair Sum in Array	Array, Two Pointers, Greedy, Sorting
1878	Get Biggest Three Rhombus Sums in a Grid	Array, Math, Sorting, Heap (Priority Queue), Matrix, Prefix Sum
1881	Maximum Value after Insertion	String, Greedy
1882	Process Tasks Using Servers	Array, Heap (Priority Queue)
1884	Egg Drop With 2 Eggs and N Floors	Math, Dynamic Programming
1887	Reduction Operations to Make the Array Elements Equal	Array, Sorting
1888	Minimum Number of Flips to Make the Binary String Alternating	String, Dynamic Programming, Sliding Window
1894	Find the Student that Will Replace the Chalk	Array, Binary Search, Simulation, Prefix Sum
1895	Largest Magic Square	Array, Matrix, Prefix Sum
1898	Maximum Number of Removable Characters	Array, Two Pointers, String, Binary Search
1899	Merge Triplets to Form Target Triplet	Array, Greedy
1901	Find a Peak Element II	Array, Binary Search, Matrix
1904	The Number of Full Rounds You Have Played	Math, String
1905	Count Sub Islands	Array, Depth-First Search, Breadth-First Search, Union Find, Matrix
1906	Minimum Absolute Difference Queries	Array, Hash Table
1907	Count Salary Categories	Database
1910	Remove All Occurrences of a Substring	String, Stack, Simulation
1911	Maximum Alternating Subsequence Sum	Array, Dynamic Programming
1914	Cyclically Rotating a Grid	Array, Matrix, Simulation
1915	Number of Wonderful Substrings	Hash Table, String, Bit Manipulation, Prefix Sum
1921	Eliminate Maximum Number of Monsters	Array, Greedy, Sorting
1922	Count Good Numbers	Math, Recursion
1926	Nearest Exit from Entrance in Maze	Array, Breadth-First Search, Matrix
1927	Sum Game	Math, String, Greedy, Game Theory
1930	Unique Length-3 Palindromic Subsequences	Hash Table, String, Bit Manipulation, Prefix Sum
1934	Confirmation Rate	Database
1936	Add Minimum Number of Rungs	Array, Greedy
1937	Maximum Number of Points with Cost	Array, Dynamic Programming, Matrix
1942	The Number of the Smallest Unoccupied Chair	Array, Hash Table, Heap (Priority Queue)
1943	Describe the Painting	Array, Hash Table, Sorting, Prefix Sum
1946	Largest Number After Mutating Substring	Array, String, Greedy
1947	Maximum Compatibility Score Sum	Array, Dynamic Programming, Backtracking, Bit Manipulation, Bitmask
1953	Maximum Number of Weeks for Which You Can Work	Array, Greedy
1954	Minimum Garden Perimeter to Collect Enough Apples	Math, Binary Search
1958	Check if Move is Legal	Array, Matrix, Enumeration
1959	Minimum Total Space Wasted With K Resizing Operations	Array, Dynamic Programming
1962	Remove Stones to Minimize the Total	Array, Greedy, Heap (Priority Queue)
1963	Minimum Number of Swaps to Make the String Balanced	Two Pointers, String, Stack, Greedy
1968	Array With Elements Not Equal to Average of Neighbors	Array, Greedy, Sorting
1969	Minimum Non-Zero Product of the Array Elements	Math, Greedy, Recursion
1975	Maximum Matrix Sum	Array, Greedy, Matrix
1976	Number of Ways to Arrive at Destination	Dynamic Programming, Graph, Topological Sort, Shortest Path
1980	Find Unique Binary String	Array, Hash Table, String, Backtracking
1981	Minimize the Difference Between Target and Chosen Elements	Array, Dynamic Programming, Matrix
1985	Find the Kth Largest Integer in the Array	Array, String, Divide and Conquer, Sorting, Heap (Priority Queue), Quickselect
1986	Minimum Number of Work Sessions to Finish the Tasks	Array, Dynamic Programming, Backtracking, Bit Manipulation, Bitmask
1992	Find All Groups of Farmland	Array, Depth-First Search, Breadth-First Search, Matrix
1993	Operations on Tree	Array, Hash Table, Tree, Depth-First Search, Breadth-First Search, Design
1996	The Number of Weak Characters in the Game	Array, Stack, Greedy, Sorting, Monotonic Stack
1997	First Day Where You Have Been in All the Rooms	Array, Dynamic Programming
2001	Number of Pairs of Interchangeable Rectangles	Array, Hash Table, Math, Counting, Number Theory
2002	Maximum Product of the Length of Two Palindromic Subsequences	String, Dynamic Programming, Backtracking, Bit Manipulation, Bitmask
2007	Find Original Array From Doubled Array	Array, Hash Table, Greedy, Sorting
2008	Maximum Earnings From Taxi	Array, Hash Table, Binary Search, Dynamic Programming, Sorting
2012	Sum of Beauty in the Array	Array
2013	Detect Squares	Array, Hash Table, Design, Counting
2017	Grid Game	Array, Matrix, Prefix Sum
2018	Check if Word Can Be Placed In Crossword	Array, Matrix, Enumeration
2023	Number of Pairs of Strings With Concatenation Equal to Target	Array, Hash Table, String, Counting
2024	Maximize the Confusion of an Exam	String, Binary Search, Sliding Window, Prefix Sum
2028	Find Missing Observations	Array, Math, Simulation
2029	Stone Game IX	Array, Math, Greedy, Counting, Game Theory
2033	Minimum Operations to Make a Uni-Value Grid	Array, Math, Sorting, Matrix
2034	Stock Price Fluctuation	Hash Table, Design, Heap (Priority Queue), Data Stream, Ordered Set
2038	Remove Colored Pieces if Both Neighbors are the Same Color	Math, String, Greedy, Game Theory
2039	The Time When the Network Becomes Idle	Array, Breadth-First Search, Graph
2043	Simple Bank System	Array, Hash Table, Design, Simulation
2044	Count Number of Maximum Bitwise-OR Subsets	Array, Backtracking, Bit Manipulation, Enumeration
2048	Next Greater Numerically Balanced Number	Hash Table, Math, Backtracking, Counting, Enumeration
2049	Count Nodes With the Highest Score	Array, Tree, Depth-First Search, Binary Tree
2054	Two Best Non-Overlapping Events	Array, Binary Search, Dynamic Programming, Sorting, Heap (Priority Queue)
2055	Plates Between Candles	Array, String, Binary Search, Prefix Sum
2058	Find the Minimum and Maximum Number of Nodes Between Critical Points	Linked List
2059	Minimum Operations to Convert Number	Array, Breadth-First Search
2063	Vowels of All Substrings	Math, String, Dynamic Programming, Combinatorics
2064	Minimized Maximum of Products Distributed to Any Store	Array, Binary Search, Greedy
2069	Walking Robot Simulation II	Design, Simulation
2070	Most Beautiful Item for Each Query	Array, Binary Search, Sorting
2074	Reverse Nodes in Even Length Groups	Linked List
2075	Decode the Slanted Ciphertext	String, Simulation
2079	Watering Plants	Array, Simulation
2080	Range Frequency Queries	Array, Hash Table, Binary Search, Design, Segment Tree
2086	Minimum Number of Food Buckets to Feed the Hamsters	String, Dynamic Programming, Greedy
2087	Minimum Cost Homecoming of a Robot in a Grid	Array, Greedy
2090	K Radius Subarray Averages	Array, Sliding Window
2091	Removing Minimum and Maximum From Array	Array, Greedy
2095	Delete the Middle Node of a Linked List	Linked List, Two Pointers
2096	Step-By-Step Directions From a Binary Tree Node to Another	String, Tree, Depth-First Search, Binary Tree
2100	Find Good Days to Rob the Bank	Array, Dynamic Programming, Prefix Sum
2101	Detonate the Maximum Bombs	Array, Math, Depth-First Search, Breadth-First Search, Graph, Geometry
2104	Sum of Subarray Ranges	Array, Stack, Monotonic Stack
2105	Watering Plants II	Array, Two Pointers, Simulation
2109	Adding Spaces to a String	Array, Two Pointers, String, Simulation
2110	Number of Smooth Descent Periods of a Stock	Array, Math, Dynamic Programming
2115	Find All Possible Recipes from Given Supplies	Array, Hash Table, String, Graph, Topological Sort
2116	Check if a Parentheses String Can Be Valid	String, Stack, Greedy
2120	Execution of All Suffix Instructions Staying in a Grid	String, Simulation
2121	Intervals Between Identical Elements	Array, Hash Table, Prefix Sum
2125	Number of Laser Beams in a Bank	Array, Math, String, Matrix
2126	Destroying Asteroids	Array, Greedy, Sorting
2130	Maximum Twin Sum of a Linked List	Linked List, Two Pointers, Stack
2131	Longest Palindrome by Concatenating Two Letter Words	Array, Hash Table, String, Greedy, Counting
2134	Minimum Swaps to Group All 1's Together II	Array, Sliding Window
2135	Count Words Obtained After Adding a Letter	Array, Hash Table, String, Bit Manipulation, Sorting
2139	Minimum Moves to Reach Target Score	Math, Greedy
2140	Solving Questions With Brainpower	Array, Dynamic Programming
2145	Count the Hidden Sequences	Array, Prefix Sum
2146	K Highest Ranked Items Within a Price Range	Array, Breadth-First Search, Sorting, Heap (Priority Queue), Matrix
2149	Rearrange Array Elements by Sign	Array, Two Pointers, Simulation
2150	Find All Lonely Numbers in the Array	Array, Hash Table, Counting
2155	All Divisions With the Highest Score of a Binary Array	Array
2161	Partition Array According to Given Pivot	Array, Two Pointers, Simulation
2162	Minimum Cost to Set Cooking Time	Math, Enumeration
2165	Smallest Value of the Rearranged Number	Math, Sorting
2166	Design Bitset	Array, Hash Table, String, Design
2170	Minimum Operations to Make the Array Alternating	Array, Hash Table, Greedy, Counting
2171	Removing Minimum Number of Magic Beans	Array, Greedy, Sorting, Enumeration, Prefix Sum
2177	Find Three Consecutive Integers That Sum to a Given Number	Math, Simulation
2178	Maximum Split of Positive Even Integers	Math, Backtracking, Greedy
2181	Merge Nodes in Between Zeros	Linked List, Simulation
2182	Construct String With Repeat Limit	Hash Table, String, Greedy, Heap (Priority Queue), Counting
2186	Minimum Number of Steps to Make Two Strings Anagram II	Hash Table, String, Counting
2187	Minimum Time to Complete Trips	Array, Binary Search
2191	Sort the Jumbled Numbers	Array, Sorting
2192	All Ancestors of a Node in a Directed Acyclic Graph	Depth-First Search, Breadth-First Search, Graph, Topological Sort
2195	Append K Integers With Minimal Sum	Array, Math, Greedy, Sorting
2196	Create Binary Tree From Descriptions	Array, Hash Table, Tree, Binary Tree
2201	Count Artifacts That Can Be Extracted	Array, Hash Table, Simulation
2202	Maximize the Topmost Element After K Moves	Array, Greedy
2207	Maximize Number of Subsequences in a String	String, Greedy, Prefix Sum
2208	Minimum Operations to Halve Array Sum	Array, Greedy, Heap (Priority Queue)
2211	Count Collisions on a Road	String, Stack, Simulation
2212	Maximum Points in an Archery Competition	Array, Backtracking, Bit Manipulation, Enumeration
2216	Minimum Deletions to Make Array Beautiful	Array, Stack, Greedy
2217	Find Palindrome With Fixed Length	Array, Math
2221	Find Triangular Sum of an Array	Array, Math, Simulation, Combinatorics
2222	Number of Ways to Select Buildings	String, Dynamic Programming, Prefix Sum
2225	Find Players With Zero or One Losses	Array, Hash Table, Sorting, Counting
2226	Maximum Candies Allocated to K Children	Array, Binary Search
2232	Minimize Result by Adding Parentheses to Expression	String, Enumeration
2233	Maximum Product After K Increments	Array, Greedy, Heap (Priority Queue)
2240	Number of Ways to Buy Pens and Pencils	Math, Enumeration
2241	Design an ATM Machine	Array, Greedy, Design
2244	Minimum Rounds to Complete All Tasks	Array, Hash Table, Greedy, Counting
2245	Maximum Trailing Zeros in a Cornered Path	Array, Matrix, Prefix Sum
2249	Count Lattice Points Inside a Circle	Array, Hash Table, Math, Geometry, Enumeration
2250	Count Number of Rectangles Containing Each Point	Array, Hash Table, Binary Search, Binary Indexed Tree, Sorting
2256	Minimum Average Difference	Array, Prefix Sum
2257	Count Unguarded Cells in the Grid	Array, Matrix, Simulation
2260	Minimum Consecutive Cards to Pick Up	Array, Hash Table, Sliding Window
2261	K Divisible Elements Subarrays	Array, Hash Table, Trie, Rolling Hash, Hash Function, Enumeration
2265	Count Nodes Equal to Average of Subtree	Tree, Depth-First Search, Binary Tree
2266	Count Number of Texts	Hash Table, Math, String, Dynamic Programming
2270	Number of Ways to Split Array	Array, Prefix Sum
2271	Maximum White Tiles Covered by a Carpet	Array, Binary Search, Greedy, Sliding Window, Sorting, Prefix Sum
2274	Maximum Consecutive Floors Without Special Floors	Array, Sorting
2275	Largest Combination With Bitwise AND Greater Than Zero	Array, Hash Table, Bit Manipulation, Counting
2279	Maximum Bags With Full Capacity of Rocks	Array, Greedy, Sorting
2280	Minimum Lines to Represent a Line Chart	Array, Math, Geometry, Sorting, Number Theory
2284	Sender With Largest Word Count	Array, Hash Table, String, Counting
2285	Maximum Total Importance of Roads	Greedy, Graph, Sorting, Heap (Priority Queue)
2288	Apply Discount to Prices	String
2289	Steps to Make Array Non-decreasing	Array, Linked List, Stack, Monotonic Stack
2294	Partition Array Such That Maximum Difference Is K	Array, Greedy, Sorting
2295	Replace Elements in an Array	Array, Hash Table, Simulation
2300	Successful Pairs of Spells and Potions	Array, Two Pointers, Binary Search, Sorting
2304	Minimum Path Cost in a Grid	Array, Dynamic Programming, Matrix
2305	Fair Distribution of Cookies	Array, Dynamic Programming, Backtracking, Bit Manipulation, Bitmask
2310	Sum of Numbers With Units Digit K	Math, Dynamic Programming, Greedy, Enumeration
2311	Longest Binary Subsequence Less Than or Equal to K	String, Dynamic Programming, Greedy, Memoization
2316	Count Unreachable Pairs of Nodes in an Undirected Graph	Depth-First Search, Breadth-First Search, Union Find, Graph
2317	Maximum XOR After Operations	Array, Math, Bit Manipulation
2320	Count Number of Ways to Place Houses	Dynamic Programming
2326	Spiral Matrix IV	Array, Linked List, Matrix, Simulation
2327	Number of People Aware of a Secret	Dynamic Programming, Queue, Simulation
2332	The Latest Time to Catch a Bus	Array, Two Pointers, Binary Search, Sorting
2333	Minimum Sum of Squared Difference	Array, Binary Search, Greedy, Sorting, Heap (Priority Queue)
2336	Smallest Number in Infinite Set	Hash Table, Design, Heap (Priority Queue), Ordered Set
2337	Move Pieces to Obtain a String	Two Pointers, String
2342	Max Sum of a Pair With Equal Sum of Digits	Array, Hash Table, Sorting, Heap (Priority Queue)
2343	Query Kth Smallest Trimmed Number	Array, String, Divide and Conquer, Sorting, Heap (Priority Queue), Radix Sort, Quickselect
2348	Number of Zero-Filled Subarrays	Array, Math
2349	Design a Number Container System	Hash Table, Design, Heap (Priority Queue), Ordered Set
2352	Equal Row and Column Pairs	Array, Hash Table, Matrix, Simulation
2353	Design a Food Rating System	Array, Hash Table, String, Design, Heap (Priority Queue), Ordered Set
2358	Maximum Number of Groups Entering a Competition	Array, Math, Binary Search, Greedy
2359	Find Closest Node to Given Two Nodes	Depth-First Search, Graph
2364	Count Number of Bad Pairs	Array, Hash Table, Math, Counting
2365	Task Scheduler II	Array, Hash Table, Simulation
2368	Reachable Nodes With Restrictions	Array, Hash Table, Tree, Depth-First Search, Breadth-First Search, Union Find, Graph
2369	Check if There is a Valid Partition For The Array	Array, Dynamic Programming
2370	Longest Ideal Subsequence	Hash Table, String, Dynamic Programming
2374	Node With Highest Edge Score	Hash Table, Graph
2375	Construct Smallest Number From DI String	String, Backtracking, Stack, Greedy
2380	Time Needed to Rearrange a Binary String	String, Dynamic Programming, Simulation
2381	Shifting Letters II	Array, String, Prefix Sum
2384	Largest Palindromic Number	Hash Table, String, Greedy, Counting
2385	Amount of Time for Binary Tree to Be Infected	Hash Table, Tree, Depth-First Search, Breadth-First Search, Binary Tree
2390	Removing Stars From a String	String, Stack, Simulation
2391	Minimum Amount of Time to Collect Garbage	Array, String, Prefix Sum
2396	Strictly Palindromic Number	Math, Two Pointers, Brainteaser
2397	Maximum Rows Covered by Columns	Array, Backtracking, Bit Manipulation, Matrix, Enumeration
2400	Number of Ways to Reach a Position After Exactly k Steps	Math, Dynamic Programming, Combinatorics
2401	Longest Nice Subarray	Array, Bit Manipulation, Sliding Window
2405	Optimal Partition of String	Hash Table, String, Greedy
2406	Divide Intervals Into Minimum Number of Groups	Array, Two Pointers, Greedy, Sorting, Heap (Priority Queue), Prefix Sum
2410	Maximum Matching of Players With Trainers	Array, Two Pointers, Greedy, Sorting
2411	Smallest Subarrays With Maximum Bitwise OR	Array, Binary Search, Bit Manipulation, Sliding Window
2414	Length of the Longest Alphabetical Continuous Substring	String
2415	Reverse Odd Levels of Binary Tree	Tree, Depth-First Search, Breadth-First Search, Binary Tree
2419	Longest Subarray With Maximum Bitwise AND	Array, Bit Manipulation, Brainteaser
2420	Find All Good Indices	Array, Dynamic Programming, Prefix Sum
2424	Longest Uploaded Prefix	Hash Table, Binary Search, Union Find, Design, Binary Indexed Tree, Segment Tree, Heap (Priority Queue), Ordered Set
2425	Bitwise XOR of All Pairings	Array, Bit Manipulation, Brainteaser
2428	Maximum Sum of an Hourglass	Array, Matrix, Prefix Sum
2429	Minimize XOR	Greedy, Bit Manipulation
2433	Find The Original Array of Prefix Xor	Array, Bit Manipulation
2434	Using a Robot to Print the Lexicographically Smallest String	Hash Table, String, Stack, Greedy
2438	Range Product Queries of Powers	Array, Bit Manipulation, Prefix Sum
2439	Minimize Maximum of Array	Array, Binary Search, Dynamic Programming, Greedy, Prefix Sum
2442	Count Number of Distinct Integers After Reverse Operations	Array, Hash Table, Math, Counting
2443	Sum of Number and Its Reverse	Math, Enumeration
2447	Number of Subarrays With GCD Equal to K	Array, Math, Number Theory
2452	Words Within Two Edits of Dictionary	Array, String, Trie
2453	Destroy Sequential Targets	Array, Hash Table, Counting
2456	Most Popular Video Creator	Array, Hash Table, String, Sorting, Heap (Priority Queue)
2457	Minimum Addition to Make Integer Beautiful	Math, Greedy
2461	Maximum Sum of Distinct Subarrays With Length K	Array, Hash Table, Sliding Window
2462	Total Cost to Hire K Workers	Array, Two Pointers, Heap (Priority Queue), Simulation
2466	Count Ways To Build Good Strings	Dynamic Programming
2467	Most Profitable Path in a Tree	Array, Tree, Depth-First Search, Breadth-First Search, Graph
2470	Number of Subarrays With LCM Equal to K	Array, Math, Number Theory
2471	Minimum Number of Operations to Sort a Binary Tree by Level	Tree, Breadth-First Search, Binary Tree
2476	Closest Nodes Queries in a Binary Search Tree	Array, Binary Search, Tree, Depth-First Search, Binary Search Tree, Binary Tree
2477	Minimum Fuel Cost to Report to the Capital	Tree, Depth-First Search, Breadth-First Search, Graph
2482	Difference Between Ones and Zeros in Row and Column	Array, Matrix, Simulation
2483	Minimum Penalty for a Shop	String, Prefix Sum
2486	Append Characters to String to Make Subsequence	Two Pointers, String, Greedy
2487	Remove Nodes From Linked List	Linked List, Stack, Recursion, Monotonic Stack
2491	Divide Players Into Teams of Equal Skill	Array, Hash Table, Two Pointers, Sorting
2492	Minimum Score of a Path Between Two Cities	Depth-First Search, Breadth-First Search, Union Find, Graph
2497	Maximum Star Sum of a Graph	Array, Greedy, Graph, Sorting, Heap (Priority Queue)
2498	Frog Jump II	Array, Binary Search, Greedy
2501	Longest Square Streak in an Array	Array, Hash Table, Binary Search, Dynamic Programming, Sorting
2502	Design Memory Allocator	Array, Hash Table, Design, Simulation
2507	Smallest Value After Replacing With Sum of Prime Factors	Math, Simulation, Number Theory
2512	Reward Top K Students	Array, Hash Table, String, Sorting, Heap (Priority Queue)
2513	Minimize the Maximum of Two Arrays	Math, Binary Search, Number Theory
2516	Take K of Each Character From Left and Right	Hash Table, String, Sliding Window
2517	Maximum Tastiness of Candy Basket	Array, Binary Search, Greedy, Sorting
2521	Distinct Prime Factors of Product of Array	Array, Hash Table, Math, Number Theory
2522	Partition String Into Substrings With Values at Most K	String, Dynamic Programming, Greedy
2523	Closest Prime Numbers in Range	Math, Number Theory
2526	Find Consecutive Integers from a Data Stream	Hash Table, Design, Queue, Counting, Data Stream
2527	Find Xor-Beauty of Array	Array, Math, Bit Manipulation
2530	Maximal Score After Applying K Operations	Array, Greedy, Heap (Priority Queue)
2531	Make Number of Distinct Characters Equal	Hash Table, String, Counting
2536	Increment Submatrices by One	Array, Matrix, Prefix Sum
2537	Count the Number of Good Subarrays	Array, Hash Table, Sliding Window
2541	Minimum Operations to Make Array Equal II	Array, Math, Greedy
2542	Maximum Subsequence Score	Array, Greedy, Sorting, Heap (Priority Queue)
2545	Sort the Students by Their Kth Score	Array, Sorting, Matrix
2546	Apply Bitwise Operations to Make Strings Equal	String, Bit Manipulation
2550	Count Collisions of Monkeys on a Polygon	Math, Recursion
2554	Maximum Number of Integers to Choose From a Range I	Array, Hash Table, Binary Search, Greedy, Sorting
2555	Maximize Win From Two Segments	Array, Binary Search, Sliding Window
2556	Disconnect Path in a Binary Matrix by at Most One Flip	Array, Dynamic Programming, Depth-First Search, Breadth-First Search, Matrix
2559	Count Vowel Strings in Ranges	Array, String, Prefix Sum
2560	House Robber IV	Array, Binary Search, Dynamic Programming, Greedy
2563	Count the Number of Fair Pairs	Array, Two Pointers, Binary Search, Sorting
2564	Substring XOR Queries	Array, Hash Table, String, Bit Manipulation
2567	Minimum Score by Changing Two Elements	Array, Greedy, Sorting
2568	Minimum Impossible OR	Array, Bit Manipulation, Brainteaser
2571	Minimum Operations to Reduce an Integer to 0	Dynamic Programming, Greedy, Bit Manipulation
2572	Count the Number of Square-Free Subsets	Array, Math, Dynamic Programming, Bit Manipulation, Bitmask
2575	Find the Divisibility Array of a String	Array, Math, String
2576	Find the Maximum Number of Marked Indices	Array, Two Pointers, Binary Search, Greedy, Sorting
2579	Count Total Number of Colored Cells	Math
2580	Count Ways to Group Overlapping Ranges	Array, Sorting
2583	Kth Largest Sum in a Binary Tree	Tree, Breadth-First Search, Sorting, Binary Tree
2587	Rearrange Array to Maximize Prefix Score	Array, Greedy, Sorting, Prefix Sum
2588	Count the Number of Beautiful Subarrays	Array, Hash Table, Bit Manipulation, Prefix Sum
2592	Maximize Greatness of an Array	Array, Two Pointers, Greedy, Sorting
2593	Find Score of an Array After Marking All Elements	Array, Hash Table, Sorting, Heap (Priority Queue), Simulation
2594	Minimum Time to Repair Cars	Array, Binary Search
2596	Check Knight Tour Configuration	Array, Depth-First Search, Breadth-First Search, Matrix, Simulation
2597	The Number of Beautiful Subsets	Array, Hash Table, Math, Dynamic Programming, Backtracking, Sorting, Combinatorics
2598	Smallest Missing Non-negative Integer After Operations	Array, Hash Table, Math, Greedy
2601	Prime Subtraction Operation	Array, Math, Binary Search, Greedy, Number Theory
2602	Minimum Operations to Make All Array Elements Equal	Array, Binary Search, Sorting, Prefix Sum
2606	Find the Substring With Maximum Cost	Array, Hash Table, String, Dynamic Programming
2607	Make K-Subarray Sums Equal	Array, Math, Greedy, Sorting, Number Theory
2610	Convert an Array Into a 2D Array With Conditions	Array, Hash Table
2611	Mice and Cheese	Array, Greedy, Sorting, Heap (Priority Queue)
2615	Sum of Distances	Array, Hash Table, Prefix Sum
2616	Minimize the Maximum Difference of Pairs	Array, Binary Search, Dynamic Programming, Greedy, Sorting
2618	Check if Object Instance of Class	-
2622	Cache With Time Limit	-
2623	Memoize	-
2624	Snail Traversal	-
2625	Flatten Deeply Nested Array	-
2627	Debounce	-
2631	Group By	-
2637	Promise Time Limit	-
2640	Find the Score of All Prefixes of an Array	Array, Prefix Sum
2641	Cousins in Binary Tree II	Hash Table, Tree, Depth-First Search, Breadth-First Search, Binary Tree
2645	Minimum Additions to Make Valid String	String, Dynamic Programming, Stack, Greedy
2649	Nested Array Generator	-
2653	Sliding Subarray Beauty	Array, Hash Table, Sliding Window
2654	Minimum Number of Operations to Make All Array Elements Equal to 1	Array, Math, Number Theory
2657	Find the Prefix Common Array of Two Arrays	Array, Hash Table, Bit Manipulation
2658	Maximum Number of Fish in a Grid	Array, Depth-First Search, Breadth-First Search, Union Find, Matrix
2661	First Completely Painted Row or Column	Array, Hash Table, Matrix
2662	Minimum Cost of a Path With Special Roads	Array, Graph, Heap (Priority Queue), Shortest Path
2671	Frequency Tracker	Hash Table, Design
2672	Number of Adjacent Elements With the Same Color	Array
2673	Make Costs of Paths Equal in a Binary Tree	Array, Dynamic Programming, Greedy, Tree, Binary Tree
2679	Sum in a Matrix	Array, Sorting, Heap (Priority Queue), Matrix, Simulation
2680	Maximum OR	Array, Greedy, Bit Manipulation, Prefix Sum
2683	Neighboring Bitwise XOR	Array, Bit Manipulation
2684	Maximum Number of Moves in a Grid	Array, Dynamic Programming, Matrix
2685	Count the Number of Complete Components	Depth-First Search, Breadth-First Search, Union Find, Graph
2693	Call Function with Custom Context	-
2694	Event Emitter	-
2698	Find the Punishment Number of an Integer	Math, Backtracking
2705	Compact Object	-
2707	Extra Characters in a String	Array, Hash Table, String, Dynamic Programming, Trie
2708	Maximum Strength of a Group	Array, Dynamic Programming, Backtracking, Greedy, Bit Manipulation, Sorting, Enumeration
2711	Difference of Number of Distinct Values on Diagonals	Array, Hash Table, Matrix
2712	Minimum Cost to Make All Characters Equal	String, Dynamic Programming, Greedy
2718	Sum of Matrix After Queries	Array, Hash Table
2721	Execute Asynchronous Functions in Parallel	-
2722	Join Two Arrays by ID	-
2730	Find the Longest Semi-Repetitive Substring	String, Sliding Window
2731	Movement of Robots	Array, Brainteaser, Sorting, Prefix Sum
2734	Lexicographically Smallest String After Substring Operation	String, Greedy
2735	Collecting Chocolates	Array, Enumeration
2740	Find the Value of the Partition	Array, Sorting
2741	Special Permutations	Array, Dynamic Programming, Bit Manipulation, Bitmask
2745	Construct the Longest New String	Math, Dynamic Programming, Greedy, Brainteaser
2746	Decremental String Concatenation	Array, String, Dynamic Programming
2747	Count Zero Request Servers	Array, Hash Table, Sliding Window, Sorting
2749	Minimum Operations to Make the Integer Zero	Bit Manipulation, Brainteaser, Enumeration
2750	Ways to Split Array Into Good Subarrays	Array, Math, Dynamic Programming
2761	Prime Pairs With Target Sum	Array, Math, Enumeration, Number Theory
2762	Continuous Subarrays	Array, Queue, Sliding Window, Heap (Priority Queue), Ordered Set, Monotonic Queue
2766	Relocate Marbles	Array, Hash Table, Sorting, Simulation
2767	Partition String Into Minimum Beautiful Substrings	Hash Table, String, Dynamic Programming, Backtracking
2768	Number of Black Blocks	Array, Hash Table, Enumeration
2770	Maximum Number of Jumps to Reach the Last Index	Array, Dynamic Programming
2771	Longest Non-decreasing Subarray From Two Arrays	Array, Dynamic Programming
2772	Apply Operations to Make All Array Elements Equal to Zero	Array, Prefix Sum
2779	Maximum Beauty of an Array After Applying Operation	Array, Binary Search, Sliding Window, Sorting
2780	Minimum Index of a Valid Split	Array, Hash Table, Sorting
2785	Sort Vowels in a String	String, Sorting
2786	Visit Array Positions to Maximize Score	Array, Dynamic Programming
2787	Ways to Express an Integer as Sum of Powers	Dynamic Programming
2789	Largest Element in an Array after Merge Operations	Array, Greedy
2799	Count Complete Subarrays in an Array	Array, Hash Table, Sliding Window
2800	Shortest String That Contains Three Strings	String, Greedy, Enumeration
2807	Insert Greatest Common Divisors in Linked List	Linked List, Math, Number Theory
2808	Minimum Seconds to Equalize a Circular Array	Array, Hash Table
2811	Check if it is Possible to Split Array	Array, Dynamic Programming, Greedy
2812	Find the Safest Path in a Grid	Array, Binary Search, Breadth-First Search, Union Find, Heap (Priority Queue), Matrix
2816	Double a Number Represented as a Linked List	Linked List, Math, Stack
2817	Minimum Absolute Difference Between Elements With Constraint	Array, Binary Search, Ordered Set
2825	Make String a Subsequence Using Cyclic Increments	Two Pointers, String
2826	Sorting Three Groups	Array, Binary Search, Dynamic Programming
2829	Determine the Minimum Sum of a k-avoiding Array	Math, Greedy
2830	Maximize the Profit as the Salesman	Array, Hash Table, Binary Search, Dynamic Programming, Sorting
2831	Find the Longest Equal Subarray	Array, Hash Table, Binary Search, Sliding Window
2834	Find the Minimum Possible Sum of a Beautiful Array	Math, Greedy
2840	Check if Strings Can be Made Equal With Operations II	Hash Table, String, Sorting
2841	Maximum Sum of Almost Unique Subarray	Array, Hash Table, Sliding Window
2844	Minimum Operations to Make a Special Number	Math, String, Greedy, Enumeration
2845	Count of Interesting Subarrays	Array, Hash Table, Prefix Sum
2849	Determine if a Cell Is Reachable at a Given Time	Math
2850	Minimum Moves to Spread Stones Over Grid	Array, Dynamic Programming, Breadth-First Search, Matrix
2856	Minimum Array Length After Pair Removals	Array, Hash Table, Two Pointers, Binary Search, Greedy, Counting
2857	Count Pairs of Points With Distance k	Array, Hash Table, Bit Manipulation
2860	Happy Students	Array, Sorting, Enumeration
2861	Maximum Number of Alloys	Array, Binary Search
2865	Beautiful Towers I	Array, Stack, Monotonic Stack
2866	Beautiful Towers II	Array, Stack, Monotonic Stack
2870	Minimum Number of Operations to Make Array Empty	Array, Hash Table, Greedy, Counting
2871	Split Array Into Maximum Number of Subarrays	Array, Greedy, Bit Manipulation
2874	Maximum Value of an Ordered Triplet II	Array
2875	Minimum Size Subarray in Infinite Array	Array, Hash Table, Sliding Window, Prefix Sum
2895	Minimum Processing Time	Array, Greedy, Sorting
2896	Apply Operations to Make Two Strings Equal	String, Dynamic Programming
2901	Longest Unequal Adjacent Groups Subsequence II	Array, String, Dynamic Programming
2904	Shortest and Lexicographically Smallest Beautiful String	String, Sliding Window
2905	Find Indices With Index and Value Difference II	Array, Two Pointers
2906	Construct Product Matrix	Array, Matrix, Prefix Sum
2909	Minimum Sum of Mountain Triplets II	Array
2910	Minimum Number of Groups to Create a Valid Assignment	Array, Hash Table, Greedy
2914	Minimum Number of Changes to Make Binary String Beautiful	String
2915	Length of the Longest Subsequence That Sums to Target	Array, Dynamic Programming
2918	Minimum Equal Sum of Two Arrays After Replacing Zeros	Array, Greedy
2919	Minimum Increment Operations to Make Array Beautiful	Array, Dynamic Programming
2924	Find Champion II	Graph
2925	Maximum Score After Applying Operations on a Tree	Dynamic Programming, Tree, Depth-First Search
2929	Distribute Candies Among Children II	Math, Combinatorics, Enumeration
2930	Number of Strings Which Can Be Rearranged to Contain Substring	Math, Dynamic Programming, Combinatorics
2933	High-Access Employees	Array, Hash Table, String, Sorting
2934	Minimum Operations to Maximize Last Elements in Arrays	Array, Enumeration
2938	Separate Black and White Balls	Two Pointers, String, Greedy
2939	Maximum Xor Product	Math, Greedy, Bit Manipulation
2943	Maximize Area of Square Hole in Grid	Array, Sorting
2944	Minimum Number of Coins for Fruits	Array, Dynamic Programming, Queue, Heap (Priority Queue), Monotonic Queue
2947	Count Beautiful Substrings I	Hash Table, Math, String, Enumeration, Number Theory, Prefix Sum
2948	Make Lexicographically Smallest Array by Swapping Elements	Array, Union Find, Sorting
2952	Minimum Number of Coins to be Added	Array, Greedy, Sorting
2957	Remove Adjacent Almost-Equal Characters	String, Dynamic Programming, Greedy
2958	Length of Longest Subarray With at Most K Frequency	Array, Hash Table, Sliding Window
2961	Double Modular Exponentiation	Array, Math, Simulation
2962	Count Subarrays Where Max Element Appears at Least K Times	Array, Sliding Window
2966	Divide Array Into Arrays With Max Difference	Array, Greedy, Sorting
2967	Minimum Cost to Make Array Equalindromic	Array, Math, Binary Search, Greedy, Sorting
2971	Find Polygon With the Largest Perimeter	Array, Greedy, Sorting, Prefix Sum
2975	Maximum Square Area by Removing Fences From a Field	Array, Hash Table, Enumeration
2976	Minimum Cost to Convert String I	Array, String, Graph, Shortest Path
2981	Find Longest Special Substring That Occurs Thrice I	Hash Table, String, Binary Search, Sliding Window, Counting
2982	Find Longest Special Substring That Occurs Thrice II	Hash Table, String, Binary Search, Sliding Window, Counting
2997	Minimum Number of Operations to Make Array XOR Equal to K	Array, Bit Manipulation
2998	Minimum Number of Operations to Make X and Y Equal	Dynamic Programming, Breadth-First Search, Memoization
3001	Minimum Moves to Capture The Queen	Math, Enumeration
3002	Maximum Size of a Set After Removals	Array, Hash Table, Greedy
3006	Find Beautiful Indices in the Given Array I	Two Pointers, String, Binary Search, Rolling Hash, String Matching, Hash Function
3007	Maximum Number That Sum of the Prices Is Less Than or Equal to K	Binary Search, Dynamic Programming, Bit Manipulation
3011	Find if Array Can Be Sorted	Array, Bit Manipulation, Sorting
3012	Minimize Length of Array Using Operations	Array, Math, Greedy, Number Theory
3015	Count the Number of Houses at a Certain Distance I	Breadth-First Search, Graph, Prefix Sum
3016	Minimum Number of Pushes to Type Word II	Hash Table, String, Greedy, Sorting, Counting
3020	Find the Maximum Number of Elements in Subset	Array, Hash Table, Enumeration
3021	Alice and Bob Playing Flower Game	Math
3025	Find the Number of Ways to Place People I	Array, Math, Geometry, Sorting, Enumeration
3026	Maximum Good Subarray Sum	Array, Hash Table, Prefix Sum
3029	Minimum Time to Revert Word to Initial State I	String, Rolling Hash, String Matching, Hash Function
3030	Find the Grid of Region Average	Array, Matrix
3034	Number of Subarrays That Match a Pattern I	Array, Rolling Hash, String Matching, Hash Function
3035	Maximum Palindromes After Operations	Array, Hash Table, String, Greedy, Sorting, Counting
3039	Apply Operations to Make String Empty	Array, Hash Table, Sorting, Counting
3040	Maximum Number of Operations With the Same Score II	Array, Dynamic Programming, Memoization
3043	Find the Length of the Longest Common Prefix	Array, Hash Table, String, Trie
3044	Most Frequent Prime	Array, Hash Table, Math, Matrix, Counting, Enumeration, Number Theory
3047	Find the Largest Area of Square Inside Two Rectangles	Array, Math, Geometry
3048	Earliest Second to Mark Indices I	Array, Binary Search
3066	Minimum Operations to Exceed Threshold Value II	Array, Heap (Priority Queue), Simulation
3067	Count Pairs of Connectable Servers in a Weighted Tree Network	Array, Tree, Depth-First Search
3070	Count Submatrices with Top-Left Element and Sum Less Than k	Array, Matrix, Prefix Sum
3071	Minimum Operations to Write the Letter Y on a Grid	Array, Hash Table, Matrix, Counting
3075	Maximize Happiness of Selected Children	Array, Greedy, Sorting
3076	Shortest Uncommon Substring in an Array	Array, Hash Table, String, Trie
3080	Mark Elements on Array by Performing Queries	Array, Hash Table, Sorting, Heap (Priority Queue), Simulation
3081	Replace Question Marks in String to Minimize Its Value	Hash Table, String, Greedy, Sorting, Heap (Priority Queue), Counting
3084	Count Substrings Starting and Ending with Given Character	Math, String, Counting
3085	Minimum Deletions to Make String K-Special	Hash Table, String, Greedy, Sorting, Counting
3091	Apply Operations to Make Sum of Array Greater Than or Equal to k	Math, Greedy, Enumeration
3092	Most Frequent IDs	Array, Hash Table, Heap (Priority Queue), Ordered Set
3096	Minimum Levels to Gain More Points	Array, Prefix Sum
3097	Shortest Subarray With OR at Least K II	Array, Bit Manipulation, Sliding Window
3100	Water Bottles II	Math, Simulation
3101	Count Alternating Subarrays	Array, Math
3106	Lexicographically Smallest String After Operations With Constraint	String, Greedy
3107	Minimum Operations to Make Median of Array Equal to K	Array, Greedy, Sorting
3111	Minimum Rectangles to Cover Points	Array, Greedy, Sorting
3112	Minimum Time to Visit Disappearing Nodes	Array, Graph, Heap (Priority Queue), Shortest Path
3115	Maximum Prime Difference	Array, Math, Number Theory
3121	Count the Number of Special Characters II	Hash Table, String
3122	Minimum Number of Operations to Satisfy Conditions	Array, Dynamic Programming, Matrix
3128	Right Triangles	Array, Hash Table, Math, Combinatorics, Counting
3129	Find All Possible Stable Binary Arrays I	Dynamic Programming, Prefix Sum
3132	Find the Integer Added to Array II	Array, Two Pointers, Sorting, Enumeration
3133	Minimum Array End	Bit Manipulation
3137	Minimum Number of Operations to Make Word K-Periodic	Hash Table, String, Counting
3138	Minimum Length of Anagram Concatenation	Hash Table, String, Counting
3143	Maximum Points Inside the Square	Array, Hash Table, String, Binary Search, Sorting
3144	Minimum Substring Partition of Equal Character Frequency	Hash Table, String, Dynamic Programming, Counting
3147	Taking Maximum Energy From the Mystic Dungeon	Array, Prefix Sum
3148	Maximum Difference Score in a Grid	Array, Dynamic Programming, Matrix
3152	Special Array II	Array, Binary Search, Prefix Sum
3153	Sum of Digit Differences of All Pairs	Array, Hash Table, Math, Counting
3159	Find Occurrences of an Element in an Array	Array, Hash Table
3160	Find the Number of Distinct Colors Among the Balls	Array, Hash Table, Simulation
3163	String Compression III	String
3164	Find the Number of Good Pairs II	Array, Hash Table
3169	Count Days Without Meetings	Array, Sorting
3170	Lexicographically Minimum String After Removing Stars	Hash Table, String, Stack, Greedy, Heap (Priority Queue)
3175	Find The First Player to win K Games in a Row	Array, Simulation
3176	Find the Maximum Length of a Good Subsequence I	Array, Hash Table, Dynamic Programming
3179	Find the N-th Value After K Seconds	Array, Math, Simulation, Combinatorics, Prefix Sum
3180	Maximum Total Reward Using Operations I	Array, Dynamic Programming
3185	Count Pairs That Form a Complete Day II	Array, Hash Table, Counting
3186	Maximum Total Damage With Spell Casting	Array, Hash Table, Two Pointers, Binary Search, Dynamic Programming, Sorting, Counting
3191	Minimum Operations to Make Binary Array Elements Equal to One I	Array, Bit Manipulation, Queue, Sliding Window, Prefix Sum
3192	Minimum Operations to Make Binary Array Elements Equal to One II	Array, Dynamic Programming, Greedy
3195	Find the Minimum Area to Cover All Ones I	Array, Matrix
3196	Maximize Total Cost of Alternating Subarrays	Array, Dynamic Programming
3201	Find the Maximum Length of Valid Subsequence I	Array, Dynamic Programming
3202	Find the Maximum Length of Valid Subsequence II	Array, Dynamic Programming
3207	Maximum Points After Enemy Battles	Array, Greedy
3208	Alternating Groups II	Array, Sliding Window
3211	Generate Binary Strings Without Adjacent Zeros	String, Backtracking, Bit Manipulation
3212	Count Submatrices With Equal Frequency of X and Y	Array, Matrix, Prefix Sum
3217	Delete Nodes From Linked List Present in Array	Array, Hash Table, Linked List
3218	Minimum Cost for Cutting Cake I	Array, Dynamic Programming, Greedy, Sorting
3220	Odd and Even Transactions	Database
3223	Minimum Length of String After Operations	Hash Table, String, Counting
3224	Minimum Array Changes to Make Differences Equal	Array, Hash Table, Prefix Sum
3227	Vowels Game in a String	Math, String, Brainteaser, Game Theory
3228	Maximum Number of Operations to Move Ones to the End	String, Greedy, Counting
3233	Find the Count of Numbers Which Are Not Special	Array, Math, Number Theory
3234	Count the Number of Substrings With Dominant Ones	String, Sliding Window, Enumeration
3239	Minimum Number of Flips to Make Binary Grid Palindromic I	Array, Two Pointers, Matrix
3240	Minimum Number of Flips to Make Binary Grid Palindromic II	Array, Two Pointers, Matrix
3243	Shortest Distance After Road Addition Queries I	Array, Breadth-First Search, Graph
3249	Count the Number of Good Nodes	Tree, Depth-First Search
3254	Find the Power of K-Size Subarrays I	Array, Sliding Window
3255	Find the Power of K-Size Subarrays II	Array, Sliding Window
3259	Maximum Energy Boost From Two Drinks	Array, Dynamic Programming
3265	Count Almost Equal Pairs I	Array, Hash Table, Sorting, Counting, Enumeration
3271	Hash Divided String	String, Simulation
3275	K-th Nearest Obstacle Queries	Array, Heap (Priority Queue)
3281	Maximize Score of Numbers in Ranges	Array, Binary Search, Greedy, Sorting
3282	Reach End of Array With Max Score	Array, Greedy
3286	Find a Safe Walk Through a Grid	Array, Breadth-First Search, Graph, Heap (Priority Queue), Matrix, Shortest Path
3290	Maximum Multiplication Score	Array, Dynamic Programming
3291	Minimum Number of Valid Strings to Form Target I	Array, String, Binary Search, Dynamic Programming, Trie, Segment Tree, Rolling Hash, String Matching, Hash Function
3295	Report Spam Message	Array, Hash Table, String
3296	Minimum Number of Seconds to Make Mountain Height Zero	Array, Math, Binary Search, Greedy, Heap (Priority Queue)
3297	Count Substrings That Can Be Rearranged to Contain a String I	Hash Table, String, Sliding Window
3301	Maximize the Total Height of Unique Towers	Array, Greedy, Sorting
3302	Find the Lexicographically Smallest Valid Sequence	Two Pointers, String, Dynamic Programming, Greedy
3305	Count of Substrings Containing Every Vowel and K Consonants I	Hash Table, String, Sliding Window
3306	Count of Substrings Containing Every Vowel and K Consonants II	Hash Table, String, Sliding Window
3309	Maximum Possible Number by Binary Concatenation	Array, Bit Manipulation, Enumeration
3310	Remove Methods From Project	Depth-First Search, Breadth-First Search, Graph
3315	Construct the Minimum Bitwise Array II	Array, Bit Manipulation
3316	Find Maximum Removals From Source String	Array, Hash Table, Two Pointers, String, Dynamic Programming
3319	K-th Largest Perfect Subtree Size in Binary Tree	Tree, Depth-First Search, Sorting, Binary Tree
3324	Find the Sequence of Strings Appeared on the Screen	String, Simulation
3325	Count Substrings With K-Frequency Characters I	Hash Table, String, Sliding Window
3326	Minimum Division Operations to Make Array Non Decreasing	Array, Math, Greedy, Number Theory
3331	Find Subtree Sizes After Changes	Array, Hash Table, String, Tree, Depth-First Search
3332	Maximum Points Tourist Can Earn	Array, Dynamic Programming, Matrix
3334	Find the Maximum Factor Score of Array	Array, Math, Number Theory
3335	Total Characters in String After Transformations I	Hash Table, Math, String, Dynamic Programming, Counting
3341	Find Minimum Time to Reach Last Room I	Array, Graph, Heap (Priority Queue), Matrix, Shortest Path
3342	Find Minimum Time to Reach Last Room II	Array, Graph, Heap (Priority Queue), Matrix, Shortest Path
3346	Maximum Frequency of an Element After Performing Operations I	Array, Binary Search, Sliding Window, Sorting, Prefix Sum
3350	Adjacent Increasing Subarrays Detection II	Array, Binary Search
3355	Zero Array Transformation I	Array, Prefix Sum
3356	Zero Array Transformation II	Array, Binary Search, Prefix Sum
3361	Shift Distance Between Two Strings	Array, String, Prefix Sum
3362	Zero Array Transformation III	Array, Greedy, Sorting, Heap (Priority Queue), Prefix Sum
3365	Rearrange K Substrings to Form Target String	Hash Table, String, Sorting
3366	Minimum Array Sum	Array, Dynamic Programming
3371	Identify the Largest Outlier in an Array	Array, Hash Table, Counting, Enumeration
3372	Maximize the Number of Target Nodes After Connecting Trees I	Tree, Depth-First Search, Breadth-First Search
3376	Minimum Time to Break Locks I	Array, Dynamic Programming, Backtracking, Bit Manipulation, Depth-First Search, Bitmask
3377	Digit Operations to Make Two Integers Equal	Math, Graph, Heap (Priority Queue), Number Theory, Shortest Path
3380	Maximum Area Rectangle With Point Constraints I	Array, Math, Binary Indexed Tree, Segment Tree, Geometry, Sorting, Enumeration
3381	Maximum Subarray Sum With Length Divisible by K	Array, Hash Table, Prefix Sum
3387	Maximize Amount After Two Days of Conversions	Array, String, Depth-First Search, Breadth-First Search, Graph
3388	Count Beautiful Splits in an Array	Array, Dynamic Programming
3393	Count Paths With the Given XOR Value	Array, Dynamic Programming, Bit Manipulation, Matrix
3394	Check if Grid can be Cut into Sections	Array, Sorting
3397	Maximum Number of Distinct Elements After Operations	Array, Greedy, Sorting
3403	Find the Lexicographically Largest String From the Box I	Two Pointers, String, Enumeration
3404	Count Special Subsequences	Array, Hash Table, Math, Enumeration
3408	Design Task Manager	Hash Table, Design, Heap (Priority Queue), Ordered Set
3409	Longest Subsequence With Decreasing Adjacent Difference	Array, Dynamic Programming
3412	Find Mirror Score of a String	Hash Table, String, Stack, Simulation
3413	Maximum Coins From K Consecutive Bags	Array, Binary Search, Greedy, Sliding Window, Sorting, Prefix Sum
3418	Maximum Amount of Money Robot Can Earn	Array, Dynamic Programming, Matrix
3419	Minimize the Maximum Edge Weight of Graph	Binary Search, Depth-First Search, Breadth-First Search, Graph, Shortest Path
3421	Find Students Who Improved	Database
3424	Minimum Cost to Make Arrays Identical	Array, Greedy, Sorting
3428	Maximum and Minimum Sums of at Most Size K Subsequences	Array, Math, Dynamic Programming, Sorting, Combinatorics
3429	Paint House IV	Array, Dynamic Programming
3433	Count Mentions Per User	Array, Math, Sorting, Simulation
3434	Maximum Frequency After Subarray Operation	Array, Hash Table, Dynamic Programming, Greedy, Enumeration, Prefix Sum
3439	Reschedule Meetings for Maximum Free Time I	Array, Greedy, Sliding Window
3440	Reschedule Meetings for Maximum Free Time II	Array, Greedy, Enumeration
3443	Maximum Manhattan Distance After K Changes	Hash Table, Math, String, Counting
3446	Sort Matrix by Diagonals	Array, Sorting, Matrix
3447	Assign Elements to Groups with Constraints	Array, Hash Table
3453	Separate Squares I	Array, Binary Search
3457	Eat Pizzas!	Array, Greedy, Sorting
3458	Select K Disjoint Special Substrings	Hash Table, String, Dynamic Programming, Greedy, Sorting
3462	Maximum Sum With at Most K Elements	Array, Greedy, Sorting, Heap (Priority Queue), Matrix
3468	Find the Number of Copy Arrays	Array, Math
3469	Find Minimum Cost to Remove Array Elements	Array, Dynamic Programming
3472	Longest Palindromic Subsequence After at Most K Operations	String, Dynamic Programming
3473	Sum of K Subarrays With Length at Least M	Array, Dynamic Programming, Prefix Sum
3475	DNA Pattern Recognition	Database
3478	Choose K Elements With Maximum Sum	Array, Sorting, Heap (Priority Queue)
3479	Fruits Into Baskets III	Array, Binary Search, Segment Tree, Ordered Set
3484	Design Spreadsheet	Array, Hash Table, String, Design, Matrix
3488	Closest Equal Element Queries	Array, Hash Table, Binary Search
3489	Zero Array Transformation IV	Array, Dynamic Programming
3493	Properties Graph	Array, Hash Table, Depth-First Search, Breadth-First Search, Union Find, Graph
3494	Find the Minimum Amount of Time to Brew Potions	Array, Simulation, Prefix Sum
3497	Analyze Subscription Conversion	Database
3499	Maximize Active Section with Trade I	String, Enumeration
3503	Longest Palindrome After Substring Concatenation I	Two Pointers, String, Dynamic Programming, Enumeration
3508	Implement Router	Array, Hash Table, Binary Search, Design, Queue, Ordered Set
3513	Number of Unique XOR Triplets I	Array, Math, Bit Manipulation
3514	Number of Unique XOR Triplets II	Array, Math, Bit Manipulation, Enumeration
3517	Smallest Palindromic Rearrangement I	String, Sorting, Counting Sort
3521	Find Product Recommendation Pairs	Database
3522	Calculate Score After Performing Instructions	Array, Hash Table, String, Simulation
3523	Make Array Non-decreasing	Array, Stack, Greedy, Monotonic Stack
3524	Find X Value of Array I	Array, Math, Dynamic Programming
3527	Find the Most Common Response	Array, Hash Table, String, Counting
3528	Unit Conversion I	Depth-First Search, Breadth-First Search, Graph
3529	Count Cells in Overlapping Horizontal and Vertical Substrings	Array, String, Rolling Hash, String Matching, Matrix, Hash Function
3531	Count Covered Buildings	Array, Hash Table, Sorting
3532	Path Existence Queries in a Graph I	Array, Hash Table, Binary Search, Union Find, Graph
3537	Fill a Special Grid	Array, Divide and Conquer, Matrix
3542	Minimum Operations to Convert All Elements to Zero	Array, Hash Table, Stack, Greedy, Monotonic Stack
3543	Maximum Weighted K-Edge Path	Hash Table, Dynamic Programming, Graph
3546	Equal Sum Grid Partition I	Array, Matrix, Enumeration, Prefix Sum
3551	Minimum Swaps to Sort by Digit Sum	Array, Hash Table, Sorting
3552	Grid Teleportation Traversal	Array, Hash Table, Breadth-First Search, Matrix
3556	Sum of Largest Prime Substrings	Hash Table, Math, String, Sorting, Number Theory
3557	Find Maximum Number of Non Intersecting Substrings	Hash Table, String, Dynamic Programming, Greedy
3558	Number of Ways to Assign Edge Weights I	Math, Tree, Depth-First Search
3561	Resulting String After Adjacent Removals	String, Stack, Simulation
3564	Seasonal Sales Analysis	Database
3566	Partition Array into Two Equal Product Subsets	Array, Bit Manipulation, Recursion, Enumeration
3567	Minimum Absolute Difference in Sliding Submatrix	Array, Sorting, Matrix
3568	Minimum Moves to Clean the Classroom	Array, Hash Table, Bit Manipulation, Breadth-First Search, Matrix
3572	Maximize Y‑Sum by Picking a Triplet of Distinct X‑Values	Array, Hash Table, Greedy, Sorting, Heap (Priority Queue)
3573	Best Time to Buy and Sell Stock V	Array, Dynamic Programming
3576	Transform Array to All Equal Elements	Array, Greedy
3577	Count the Number of Computer Unlocking Permutations	Array, Math, Brainteaser, Combinatorics
3578	Count Partitions With Max-Min Difference at Most K	Array, Dynamic Programming, Queue, Sliding Window, Prefix Sum, Monotonic Queue
3580	Find Consistently Improving Employees	Database
3583	Count Special Triplets	Array, Hash Table, Counting
3584	Maximum Product of First and Last Elements of a Subsequence	Array, Two Pointers
3586	Find COVID Recovery Patients	Database
3587	Minimum Adjacent Swaps to Alternate Parity	Array, Greedy
3588	Find Maximum Area of a Triangle	Array, Hash Table, Math, Greedy, Geometry, Enumeration
3589	Count Prime-Gap Balanced Subarrays	Array, Math, Queue, Sliding Window, Number Theory, Monotonic Queue
3592	Inverse Coin Change	Array, Dynamic Programming
3593	Minimum Increments to Equalize Leaf Paths	Array, Dynamic Programming, Tree, Depth-First Search
3597	Partition String	Hash Table, String, Trie, Simulation
3598	Longest Common Prefix Between Adjacent Strings After Removals	Array, String
3599	Partition Array to Minimize XOR	Array, Dynamic Programming, Bit Manipulation, Prefix Sum
3601	Find Drivers with Improved Fuel Efficiency	Database
3603	Minimum Cost Path with Alternating Directions II	Array, Dynamic Programming, Matrix
3604	Minimum Time to Reach Destination in Directed Graph	Graph, Heap (Priority Queue), Shortest Path
3607	Power Grid Maintenance	Array, Hash Table, Depth-First Search, Breadth-First Search, Union Find, Graph, Heap (Priority Queue), Ordered Set
3608	Minimum Time for K Connected Components	Binary Search, Union Find, Graph, Sorting
3611	Find Overbooked Employees	Database
3612	Process String with Special Operations I	String, Simulation
3613	Minimize Maximum Component Cost	Binary Search, Sort, Union Find, Graph
3618	Split Array by Prime Indices	Array, Math, Number Theory
3619	Count Islands With Total Value Divisible by K	Array, Depth-First Search, Breadth-First Search, Union Find, Matrix
3623	Count Number of Trapezoids I	Array, Hash Table, Math, Geometry
3626	Find Stores with Inventory Imbalance	-
3627	Maximum Median Sum of Subsequences of Size 3	-
3628	Maximum Number of Subsequences After One Inserting	-
3629	Minimum Jumps to Reach End via Prime Teleportation	-
3634	Minimum Removals to Balance Array	-
3635	Earliest Finish Time for Land and Water Rides II	-
3638	Maximum Balanced Shipments	-
3639	Minimum Time to Activate String	-