leetcode_practice

1. Leetcode

ID	Title	Category	Difficulty	C++
0001	Two Sum	Array	Easy	C++
0002	Add Two Numbers	Linked List	Medium	C++
0003	Longest Substring Without Repeating Characters	Hashed Table, Two Pointers, String	Medium	C++
0004	Median of Two Sorted Arrays	Array, Binary Search, Divde and Conquer	Hard	C++
0005	Longest Palindromic Substring	String, Dynamic Programming	Medium	C++
0006	ZigZag Conversion	String	Medium	C++
0007	Reverse Integer	Math	Easy	C++
0008	String to Integer (atoi)	String	Medium	C++
0010	Regular Expression Matching	DP	Hard	C++
0012	Integer to Roman	Hash	Medium	C++
0013	Roman to Integer	String, Hash	Easy	C++
0014	Longest Common Prefix	String	Easy	C++
0015	3Sum	Array, Two Pointers	Medium	C++
0016	3Sum Closest	Two Pointers	Medium	C++
0017	Letter Combinations of a Phone Number	Backtracking	Medium	C++
0019	Remove Nth Node From End of List	Linked List	Medium	C++
0020	Valid Parentheses	Stack	Easy	C++
0021	Merge Two Sorted Lists	Linked List, Recursion	Easy	C++
0022	Generate Parentheses	String, Backtracking, Dynamic Programming	Medium	C++
0023	Merge k Sorted Lists	Linked List, Divide and Conquer, Heap	Hard	C++
0024	Swap Nodes in Pairs	Linked List	Medium	C++
0025	Reverse Nodes in k-Group	Linked List	Hard	C++
0026	Remove Duplicates from Sorted Array	Two Pointers	Easy	C++
0028	Implement strStr()	String	Easy	C++
0029	Divide Two Integers	Bit	Medium	C++
0030	Substring with Concatenation of All Words	Hash	Hard	C++
0031	Next Permutation	Two Pointers	Medium	C++
0032	Longest Valid Parentheses	Dynamic Programming	Hard	C++
0033	Search in Rotated Sorted Array	Array, Binary Search	Medium	C++
0034	Find First and Last Position of Element in Sorted Array	Two Pointers	Medium	C++
0035	Search Insert Position	Binary Search	Easy	C++
0036	Valid Sudoku	Hash	Medium	C++
0037	Sudoku Solver	Backtracking	Hard	C++
0038	Count and Say	String	Medium	C++
0040	Combination Sum II	Backtracking	Medium	C++
0041	First Missing Positive	Array	Hard	C++
0042	Trapping Rain Water	Array, Two Pointers, Dynamic Programming, Stack	Hard	C++
0044	Wildcard Matching	Dynamic Programming, Greedy	Hard	C++
0045	Jump Game II	Array,Greedy	Hard	C++
0046	Permutations	Backtracking	Medium	C++
0047	Permutations II	Backtracking	Medium	C++
0048	Rotate Image	Array	Medium	C++
0049	Group Anagrams	Hash	Medium	C++
0051	N-Queens	Backtracking	Hard	C++
0053	Maximum Subarray	DP	Easy	C++
0055	Jump Game	Greedy	Medium	C++
0056	Merge Intervals	Array, Sort	Medium	C++
0057	Insert Interval	Array	Medium	C++
0060	Permutation Sequence	Math, Backtracking	Hard	C++
0062	Unique Paths	DP	Medium	C++
0063	Unique Paths II	DP	Medium	C++
0064	Minimum Path Sum	DP	Medium	C++
0067	Add Binary	Math	Easy	C++
0069	Sqrt(x)	Math, Binary Search	Easy	C++
0070	Climbing Stairs	DP, Math	Easy	C++
0071	Simplify Path	String, Stack	Medium	C++
0072	Edit Distance	DP	Hard	C++
0075	Sort Colors	Sort	Medium	C++
0076	Minimum Window Substring	Hash Table, String, Sliding Window	Hard	C++
0077	Combinations	Backtracking	Medium	C++
0079	Word Search	Backtracking	Medium	C++
0080	Remove Duplicates from Sorted Array II	Two Pointers	Medium	C++
0081	Search in Rotated Sorted Array II	Binary Search	Medium	C++
0082	Remove Duplicates from Sorted List II	Two Pointers	Medium	C++
0083	Remove Duplicates from Sorted List	Linked List	Easy	C++
0086	Partition List	Linked List, Two Pointers	Medium	C++
0088	Merge Sorted Array	Two Pointers	Easy	C++
0091	Decode Ways	DP	Medium	C++
0092	Reverse Linked List II	Linked List	Medium	C++
0093	Restore IP Addresses	String, Backtracking	Medium	C++
0094	Binary Tree Inorder Traversal	Stack, Tree	Medium	C++
0097	Interleaving String	DP	Medium	C++
0098	Validate Binary Search Tree	Stack, Tree	Medium	C++
0099	Recover Binary Search Tree	Binary Tree	Medium	C++
0100	Same Tree	DFS, BFS	Easy	C++
0101	Symmetric Tree	Binary Tree	Easy	C++
0102	Binary Tree Level Order Traversal	Binary Tree	Medium	C++
0103	Binary Tree Zigzag Level Order Traversal	BFS	Medium	C++
0104	Maximum Depth of Binary Tree	Binary Tree	Easy	C++
0105	Construct Binary Tree from Preorder and Inorder Traversal	Binary Tree	Medium	C++
0106	Construct Binary Tree from Inorder and Postorder Traversal	Divide and Conquer	Medium	C++
0108	Convert Sorted Array to Binary Search Tree	Divide and Conquer	Easy	C++
0109	Convert Sorted List to Binary Search Tree	Binary Tree	Medium	C++
0110	Balanced Binary Tree	Binary Tree	Easy	C++
0112	Path Sum	DFS, BFS	Easy	C++
0114	Flatten Binary Tree to Linked List	Binary Tree, DFS	Medium	C++
0118	Pascal's Triangle	Dynamic Programming	Easy	C++
0120	Triangle	Array, Dynamic Programming	Medium	C++
0121	Best Time to Buy and Sell Stock	Array, Dynamic Programming	Easy	C++
0122	Best Time to Buy and Sell Stock II	Array, Greedy	Easy	C++
0123	Best Time to Buy and Sell Stock III	Array, Dynamic Programming	Hard	C++
0124	Binary Tree Maximum Path Sum	Dynamic Programming, DFS	Hard	C++
0126	Word Ladder II	BFS, DFS	Hard	C++
0128	Longest Consecutive Sequence	Array, Union Find	Hard	C++
0129	Sum Root to Leaf Numbers	DFS	Medium	C++
0130	Surrounded Regions	BFS, DFS, Union Find	Medium	C++
0131	Palindrome Partitioning	Backtracking	Medium	C++
0133	Clone Graph	DFS, BFS, Hash	Medium	C++
0134	Gas Station	Greedy	Medium	C++
0135	Candy	Greedy	Hard	C++
0136	Single Number	Bit	Easy	C++
0139	Word Break	DP	Medium	C++
0141	Linked List Circle	Linked List	Easy	C++
0142	Linked List Circle II	Linked List	Medium	C++
0144	Binary Tree Preorder Traversal	Binary Tree	Easy	C++
0145	Binary Tree Postorder Traversal	Stack, Tree	Medium	C++
0146	LRU Cache	LRU	Medium	C++
0148	Sort List	Linked List, Merge Sort	Medium	C++
0149	Max Points on a Line	Hash	Hard	C++
0150	Evaluate Reverse Polish Notation	Stack	Medium	C++
0151	Reverse Words in a String	Two Pointers, String	Medium	C++
0153	Find Minimum in Rotated Sorted Array	Array, Binary Search	Medium	C++
0154	Find Minimum in Rotated Sorted Array II	Array, Binary Search	Hard	C++
0155	Min Stack	Stack	Easy	C++
0160	Intersection of Two Linked Lists	Linked Lists, Two Pointers	Easy	C++
0167	Two Sum II - Input Array Is Sorted	Two Pointers	Medium	C++
0168	Excel Sheet Column Title	Math	Easy	C++
0169	Majority Element	Array, Hash Table, Divde and Conquer, Sorting, Counting	Easy	C++
0172	Factorial Trailing Zeroes	Math	Medium	C++
0173	Binary Search Tree Iterator	Stack, Binary Tree	Medium	C++
0188	Best Time to Buy and Sell Stock IV	Dynamic Programming	Hard	C++
0190	Reverse Bits	Bit	Easy	C++
0191	Number of 1 Bits	Bit	Easy	C++
0198	House Robber	Dynamic Programming	Easy	C++
0199	Binary Tree Right Side View	BFS, DFS	Medium	C++
0200	Number of Islands	DFS,BFS,Union Find	Medium	C++
0202	Happy Number	Two Pointers	Easy	C++
0204	Count Primes	Math	Medium	C++
0205	Isomorphic Strings	String, Hash	Easy	C++
0206	Reverse Linked List	Linked List	Easy	C++
0207	Course Schedule	Topological Sort, BFS	Medium	C++
0208	Implement Trie (Prefix Tree)	Trie	Medium	C++
0210	Course Schedule II	Topological Sort	Medium	C++
0211	Design Add and Search Words Data Structure	Trie, DFS	Medium
0212	Word Search II	Trie, Backtracking	Hard	C++
0213	House Robber II	Dynamic Programming	Medium	C++
0215	Kth Largest Element in an Array	Divide and Conquer, Heap	Medium	C++
0216	Combination Sum III	Backtracking	Medium	C++
0217	Contains Duplicate	Set	Easy	C++
0218	The Skyline Problem	Heap	Hard	C++
0219	Contains Duplicate II	Hash	Easy	C++
0221	Maximal Square	Dynamic Programming	Medium	C++
0222	Count Complete Tree Nodes	Binary Search, DFS	Medium	C++
0223	Rectangle Area	Geometry	Medium	C++
0224	Basic Calculator	Math, Stack	Hard	C++
0225	Implement Stack using Queues	Stack, Queue	Easy	C++
0226	Invert Binary Tree	Binary Tree	Easy	C++
0227	Basic Calculator II	String, Stack	Medium	C++
0232	Implement Queue using Stacks	Stack	Easy	C++
0234	Palindrome Linked List	Linked List, Two Pointers, Stack, Recursion	Easy	C++
0235	Lowest Common Ancestor of a Binary Search Tree	Binary Search Tree	Easy	C++
0236	Lowest Common Ancestor of a Binary Tree	Binary Tree	Medium	C++
0238	Product of Array Except Self	Math	Medium	C++
0239	Sliding Window Maximum	Deque	Hard	C++
0240	Search a 2D Matrix II	Binary Search	Medium	C++
0241	Different Ways to Add Parentheses	Divide and Conquer	Medium	C++
0242	Valid Anagram	String, Hash	Easy	C++
0257	Binary Tree Paths	DFS, Tree	Easy	C++
0260	Single Number III	Bit	Medium	C++
0263	Ugly Number	Math	Easy	C++
0268	Missing Number	Bit	Easy	C++
0279	Perfect Squares	DP, Math	Medium	C++
0284	Peeking Iterator	Iterator, Design	Medium	C++
0287	Find the Duplicate Number	Two Pointers, Binary Search	Medium	C++
0290	Word Pattern	Hash	Easy	C++
0295	Find Median from Data Stream	Heap	Hard	C++
0296	Best Meeting Point 1 2	Math	Medium	C++
0300	Longest Increasing Subsequence	DP	Medium	C++
0303	Range Sum Query - Immutable	Prefix Sum	Easy	C++
0304	Range Sum Query 2D - Immutable	Prefix Sum	Medium	C++
0307	Range Sum Query - Mutable	Fenwick Tree, Segment Tree	Medium	C++
0309	Best Time to Buy and Sell Stock with Cooldown	Dynamic Programming	Medium	C++
0310	Minimum Height Trees	Topological Sort	Medium	C++
0312	Burst Balloons	Divide and Conquer, DP	Hard	C++
0313	Super Ugly Number	DP, Heap	Medium	C++
0315	Count of Smaller Numbers After Self	Divide and Conquer, Merge Sort, Segment Tree	Hard	C++
0316	Remove Duplicate Letters	Greedy, Monotonic Stack	Hard	C++
0318	Maximum Product of Word Lengths	Bit	Medium	C++
0322	Coin Change	DP	Medium	C++
0326	Power of Three	Math	Easy	C++
0328	Odd Even Linked List	Linked List	Medium	C++
0329	Longest Increasing Path in a Matrix	DFS, Topological Sort, DP	Hard	C++
0332	Reconstruct Itinerary	Multiset, DFS, Graph, Eulerian Circuit	Hard	C++
0334	Increasing Triplet Subsequence	Greedy	Medium	C++
0336	Palindrome Pairs	Hash, Trie	Hard	C++
0338	Counting Bits	Bit	Easy	C++
0340	Longest Substring with At Most K Distinct Characters	Two Pointers	Hard	C++
0341	Flatten Nested List Iterator	DFS, Stack	Medium	C++
0342	Power of Four	Bit	Easy	C++
0343	Integer Break	DP, Math	Medium	C++
0345	Reverse Vowels of a String	Two Pointers	Easy	C++
0347	Top K Frequent Elements	Sort	Medium	C++
0352	Data Stream as Disjoint Intervals	Binary Search, Ordered Set	Hard	C++
0354	Russian Doll Envelopes	Binary Search, Dynamic Programming	Hard	C++
0363	Max Sum of Rectangle No Larger Than K	Prefix Sum, Binary Search, Ordered Set	Hard	C++
0372	Super Pow	Math	Medium	C++
0373	Find K Pairs with Smallest Sums	Binary Search, Heap	Medium	C++
0374	Guess Number Higher or Lower	Binary Search	Easy	C++
0376	Wiggle Subsequence	DP	Medium	C++
0377	Combination Sum IV	DP	Medium	C++
0378	Kth Smallest Element in a Sorted Matrix	Binary Search	Medium	C++
0380	Insert Delete GetRandom O(1)	Hash, Random	Medium	C++
0382	Linked List Random Node	Math	Medium	C++
0383	Ransom Note	Hash	Easy	C++
0384	Shuffle an Array	Math	Medium	C++
0387	First Unique Character in a String	Hash, Queue	Easy	C++
0393	UTF-8 Validation	Bit Manipulation	Medium	C++
0394	Decode String	String, Stack, Recursion	Medium	C++
0399	Evaluate Division	BFS, DFS, Disjoint Union Set	Medium	C++
0402	Remove K Digits	Greedy, Monotonic Stack	Medium	C++
0404	Sum of Left Leaves	Binary Tree	Easy	C++
0406	Queue Reconstruction by Height	Greedy, Segment Tree	Medium	C++
0409	Longest Palindrome	Greedy, String	Easy	C++
0411	Minimum Unique Word Abbreviation	Bit Mask	Hard	C++
0413	Arithmetic Slices	DP	Medium	C++
0415	Add Strings	Math	Easy	C++
0416	Partition Equal Subset Sum	DP	Medium	C++
0417	Pacific Atlantic Water Flow	BFS, DFS	Medium	C++
0424	Longest Repeating Character Replacement	Hash Table, String, Sliding Window	Medium	C++
0427	Construct Quad Tree	Divide and Conquer	Medium	C++
0429	N-ary Tree Level Order Traversal	BFS	Medium	C++
0432	All O`one Data Structure	Design	Hard	C++
0433	Minimum Genetic Mutation	BFS	Medium	C++
0435	Non-overlapping Intervals	Greedy	Medium	C++
0437	Path Sum III	Linked List, Prefix Sum	Medium	C++
0443	String Compression	Two Pointers	Medium	C++
0438	Find All Anagrams in a String	Sliding Window, Hash	Medium	C++
0446	Arithmetic Slices II - Subsequence	DP	Hard	C++
0448	Find All Numbers Disappeared in an Array	Array	Easy	C++
0450	Delete Node in a BST	Binary Tree	Medium	C++
0451	Sort Characters By Frequency	Sort	Medium	C++
0452	Minimum Number of Arrows to Burst Balloons	Sort, Greedy	Medium	C++
0455	Assign Cookies	Greedy	Easy	C++
0456	132 Pattern	Monotonic Stack	Medium	C++
0458	Poor Pigs	DP, Combinatorics, Math	Hard	C++
0460	LFU Cache	Hash, Double Linked List	Hard	C++
0461	Hamming Distance	Bit	Easy	C++
0462	Minimum Moves to Equal Array Elements II	Math	Medium	C++
0464	Can I Win	Math, Bit	Medium	C++
0470	Implement Rand10() Using Rand7()	Math	Medium	C++
0472	Concatenated Words	DP, Trie	Hard	C++
0473	Matchsticks to Square	Backtracking, DP	Medium	C++
0474	Ones and Zeroes	DP	Medium	C++
0476	Number Complement	Bit	Easy	C++
0481	Magical String	Two Pointers	Medium	C++
0491	Non-decreasing Subsequences	Backtracking, Bit	Medium	C++
0494	Target Sum	DP	Medium	C++
0496	Next Greater Element I	Stack	Easy	C++
0502	IPO	Heap, Sort, Greedy	Hard	C++
0503	Next Greater Element II	Monotonic Stack	Medium	C++
0504	Base 7	Math	Easy	C++
0509	Fibonacci Number	Math	Easy	C++
0513	Find Bottom Left Tree Value	Binary Tree	Easy	C++
0516	Longest Palindromic Subsequence	DP	Medium	C++
0520	Detect Capital	String	Easy	C++
0523	Continuous Subarray Sum	Prefix	Medium	C++
0524	Longest Word in Dictionary through Deleting	Greedy, State Machine	Medium	C++
0528	Random Pick with Weight	Math	Medium	C++
0530	Minimum Absolute Difference in BST	Binary Tree	Easy	C++
0535	Encode and Decode TinyURL	Hash, String	Medium	C++
0538	Convert BST to Greater Tree	Binary Tree	Medium	C++
0540	Single Element in a Sorted Array	Binary Search	Medium	C++
0542	01 Matrix	DP	Medium	C++
0543	Diameter of Binary Tree	Binary Tree	Easy	C++
0547	Number of Provinces	DFS, Union Find	Medium	C++
0557	Reverse Words in a String III	String	Easy	C++
0560	Subarray Sum Equals K	Prefix Sum, Hash	Medium	C++
0566	Reshape the Matrix	Matrix	Easy	C++
0567	Permutation in String	Two Pointers, Sliding Window	Medium	C++
0572	Subtree of Another Tree	Binary Tree	Easy	C++
0576	Out of Boundary Paths	DP, DFS	Medium	C++
0581	Shortest Unsorted Continuous Subarray	Two Pointers	Medium	C++
0583	Delete Operation for Two Strings	DP	Medium	C++
0587	Erect the Fence	Geometry	Hard	C++
0594	Longest Harmonious Subsequence	Hash, Two Pointers	Easy	C++
0605	Can Place Flowers	Greedy	Easy	C++
0606	Construct String from Binary Tree	DFS	Easy	C++
0609	Find Duplicate File in System	Hash	Medium	C++
0617	Merge Two Binary Trees	Binary Tree	Easy	C++
0622	Design Circular Queue	Queue, Design	Medium	C++
0623	Add One Row to Tree	DFS, BFS	Medium	C++
0629	K Inverse Pairs Array	DP	Hard	C++
0630	Course Schedule III	Greedy, Heap	Hard	C++
0633	Sum of Square Numbers	Two Pointers	Medium	C++
0636	Exclusive Time of Functions	Stack	Medium	C++
0637	Average of Levels in Binary Tree	Binary Tree	Easy	C++
0640	Solve the Equation	Simulation	Medium	C++
0641	Design Circular Deque	Queue, Design	Medium	C++
0645	Set Mismatch	Hash, Bit	Easy	C++
0646	Maximum Length of Pair Chain	DP	Medium	C++
0647	Palindromic Substrings	String, DP	Medium	C++
0650	2 Keys Keyboard	DP, Math	Medium	C++
0652	Find Duplicate Subtrees	Hash, DFS	Medium	C++
0653	Two Sum IV - Input is a BST	Binary Tree	Easy	C++
0654	Maximum Binary Tree	Divide and Conquer, Segment Tree, Monotonic Stack	Medium	C++
0655	Print Binary Tree	DFS, BFS	Medium	C++
0658	Find K Closest Elements	Binary Search, Two Pointers	Medium	C++
0659	Split Array into Consecutive Subsequences	Hash, Greedy, Heap	Medium	C++
0662	Maximum Width of Binary Tree	DFS, BFS	Medium	C++
0665	Non-decreasing Array	Greedy	Medium	C++
0667	Beautiful Arrangement II	Math	Medium	C++
0668	Kth Smallest Number in Multiplication Table	Binary Search	Medium	C++
0669	Trim a Binary Search Tree	Binary Tree	Medium	C++
0670	Maximum Swap	Greedy	Medium	C++
0672	Bulb Switcher II	Math	Medium	C++
0674	Longest Continuous Increasing Subsequence	Array	Easy	C++
0675	Cut Off Trees for Golf Event	BFS	Hard	C++
0680	Valid Palindrome II	Two Pointers	Easy	C++
0684	Redundant Connection	Union Find	Medium	C++
0687	Longest Univalue Path	Binary Trree	Easy	C++
0692	Top K Frequent Words	Priority Queue	Medium	C++
0693	Binary Number with Alternating Bits	Bit	Easy	C++
0695	Max Area of Island	DFS	Medium	C++
0696	Count Binary Substrings	String	Easy	C++
0697	Degree of an Array	Hash	Easy	C++
0698	Partition to K Equal Sum Subsets	DP, Greedy, Backtracking, Memoization	Medium	C++
0704	Binary Search	Binary Search	Easy	C++
0705	Design HashSet	Hash	Easy	C++
0706	Design HashMap	Hash	Easy	C++
0707	Design Linked List	Linked List, Design	Medium	C++
0714	Best Time to Buy and Sell Stock with Transaction Fee	Array, Dynamic Programming, Greedy	Medium	C++
0716	Max Stack	design	Easy	C++
0718	Maximum Length of Repeated Subarray	Array, Binary Search, DP, Sliding Window, Rolling Hash, Hash	Medium	C++
0719	Find K-th Smallest Pair Distance	Binary Search	Hard	C++
0727	Minimum Window Subsequence	DP	Hard	C++
0729	My Calendar I	Binary Search, Segment Tree	Medium	C++
0732	My Calendar III	Differece Array, Segment Tree	Hard	C++
0739	Daily Temperatures	Monotonic Stack	Medium	C++
0743	Network Delay Time	Shortest Path	Medium	C++
0746	Min Cost Climbing Stairs	DP	Easy	C++
0745	Prefix and Suffix Search	Trie, Prefix	Hard	C++
0753	Cracking the Safe	Eulerian Circuit	Hard	C++
0754	Reach a Number	Math	Medium	C++
0761	Special Binary String	Recursion	Hard	C++
0764	Largest Plus Sign	DP	Medium	C++
0766	Toeplitz Matrix	Matrix	Easy	C++
0768	Max Chunks To Make Sorted II	Greedy, Monotonic Stack	Hard	C++
0769	Max Chunks To Make Sorted	Monotonic Stack	Medium	C++
0772	Basic Calculator III	Stack, String	Hard	C++
0775	Global and Local Inversions	Math, Segment Tree	Medium	C++
0777	Swap Adjacent in LR String	Two Pointers	Medium	C++
0779	K-th Symbol in Grammar	Recursion	Medium	C++
0782	Transform to Chessboard	Bit	Hard	C++
0783	Minimum Distance Between BST Nodes	BST	Easy	C++
0784	Letter Case Permutation	Bit, Backtracking	Medium	C++
0785	Is Graph Bipartite?	Graph, BFS	Medium	C++
0787	Cheapest Flights Within K Stops	Shortest Path	Medium	C++
0788	Rotated Digits	DP	Medium	C++
0790	Domino and Tromino Tiling	DP	Medium	C++
0791	Custom Sort String	Hash	Medium	C++
0792	Number of Matching Subsequences	Hash, Greedy, State Machine	Medium	C++
0793	Preimage Size of Factorial Zeroes Function	Math, Binary Search	Hard	C++
0795	Number of Subarrays with Bounded Maximum	Monotonic Stack	Medium	C++
0797	All Paths From Source to Target	Backtracking, DFS, BFS	Medium	C++
0799	Champagne Tower	DP	Medium	C++
0801	Minimum Swaps To Make Sequences Increasing	DP	Hard	C++
0804	Unique Morse Code Words	Hash	Easy	C++
0805	Split Array With Same Average	Bit, DP	Hard	C++
0808	Soup Servings	DP	Medium	C++
0811	Subdomain Visit Count	String, Hash	Medium	C++
0813	Largest Sum of Averages	DP	Medium	C++
0814	Binary Tree Pruning	DFS	Medium	C++
0816	Ambiguous Coordinates	Backtracking	Medium	C++
0817	Linked List Components	Hash	Medium	C++
0820	Short Encoding of Words	Trie, Suffix	Medium	C++
0823	Binary Trees With Factors	DP	Medium	C++
0827	Making A Large Island	DFS, BFS, Union Find	Hard	C++
0828	Count Unique Characters of All Substrings of a Given String	Hash, DP	Hard	C++
0831	Masking Personal Information	String	Medium	C++
0834	Sum of Distances in Tree	DP, DFS	Hard	C++
0835	Image Overlap	Matrix, Bit	Medium	C++
0838	Push Dominoes	Two Pointers	Medium	C++
0841	Keys and Rooms	DFS, BFS	Medium	C++
0844	Backspace String Compare	Stack, Two Pointers	Easy	C++
0850	Rectangle Area II	Line Sweep, Segment Tree	Hard	C++
0854	K-Similar Strings	BFS, DFS	Hard	C++
0855	Exam Room	Heap	Medium	C++
0856	Score of Parentheses	Stack	Medium	C++
0857	Minimum Cost to Hire K Workers	Greedy, Heap	Hard	C++
0858	Mirror Reflection	Math, Geometry	Medium	C++
0862	Shortest Subarray with Sum at Least K	Prefix, Monotonic Stack, Heap, Queue	Hard	C++
0864	Shortest Path to Get All Keys	BFS, Bit	Hard	C++
0867	Transpose Matrix	Simulation	Easy	C++
0869	Reordered Power of 2	Sort	Medium	C++
0870	Advantage Shuffle	Greedy	Medium	C++
0871	Minimum Number of Refueling Stops	Greedy, Heap, DP	Hard	C++
0872	Leaf-Similar Trees	DFS	Easy	C++
0875	Koko Eating Bananas	Binary Search	Medium	C++
0876	Middle of the Linked List	Two Pointers	Easy	C++
0878	Nth Magical Number	Binary Search	Hard	C++
0881	Boats to Save People	Greedy, Two Pointers	Medium	C++
0882	Reachable Nodes In Subdivided Graph	Dijstra, Bellman Ford, Heap	Hard	C++
0889	Construct Binary Tree from Preorder and Postorder Traversal	Binary Tree	Medium	C++
0890	Find and Replace Pattern	Hash	Medium	C++
0891	Sum of Subsequence Widths	Math	Hard	C++
0895	Maximum Frequency Stack	Hash	Hard	C++
0897	Increasing Order Search Tree	Binary Tree	Easy	C++
0899	Orderly Queue	Sort	Hard	C++
0901	Online Stock Span	Monotonic Stack	Medium	C++
0902	Numbers At Most N Given Digit Set	DP	Hard	C++
0904	Fruit Into Baskets	Sliding Window	Medium	C++
0905	Sort Array By Parity	Two Pointers	Easy	C++
0909	Snakes and Ladders	BFS	Medium	C++
0912	Sort an Array	Array	Medium	C++
0915	Partition Array into Disjoint Intervals	Prefix, Suffix	Medium	C++
0916	Word Subsets	Hash	Medium	C++
0918	Maximum Sum Circular Subarray	Dynamic Programming	Medium	C++
0919	Complete Binary Tree Inserter	BFS	Medium	C++
0921	Minimum Add to Make Parentheses Valid	Greedy	Medium	C++
0926	Flip String to Monotone Increasing	DP, Prefix Sum	Medium	C++
0927	Three Equal Parts	Simulation, Math	Hard	C++
0930	Binary Subarrays With Sum	Prerfix Sum, Sliding Window, Hash	Medium	C++
0931	Minimum Falling Path Sum	DP	Medium	C++
0932	Beautiful Array	Divide and Conquer, DP	Medium	C++
0934	Shortest Bridge	BFS	Medium	C++
0936	Stamping The Sequence	Greedy, Topological Sort	Hard	C++
0938	Range Sum of BST	Binary Search Tree	Easy	C++
0940	Distinct Subsequences II	DP	Hard	C++
0944	Delete Columns to Make Sorted	Simulation	Easy	C++
0946	Validate Stack Sequences	Stack, Simulation	Medium	C++
0947	Most Stones Removed with Same Row or Column	Union Find	Medium	C++
0948	Bag of Tokens	Greedy, Sort	Medium	C++
0949	Largest Time for Given Digits	Math	Medium	C++
0953	Verifying an Alien Dictionary	Hash	Easy	C++
0958	Check Completeness of a Binary Tree	BFS	Medium	C++
0967	Numbers With Same Consecutive Differences	DFS, BFS	Medium	C++
0968	Binary Tree Cameras	Greedy, DP	Hard	C++
0974	Subarray Sums Divisible by K	Prefix Sum	Medium	C++
0976	Largest Perimeter Triangle	Greedy	Easy	C++
0980	Unique Paths III	Backtracking, DP	Hard	C++
0981	Time Based Key-Value Store	Hash, Binary Search	Medium	C++
0982	Triples with Bitwise AND Equal To Zero	Hash, Bit	Hard	C++
0983	Minimum Cost For Tickets	DP	Medium	C++
0985	Sum of Even Numbers After Queries	Simulation	Medium	C++
0987	Vertical Order Traversal of a Binary Tree	Hash, BFS, DFS	Hard	C++
0989	Add to Array-Form of Integer	Math	Easy	C++
0990	Satisfiability of Equality Equations	Union Find	Medium	C++
0997	Find the Town Judge	Hash	Easy	C++
0998	Maximum Binary Tree II	Binary Tree	Medium	C++
1000	Minimum Cost to Merge Stones	DP	Hard	C++
1011	Capacity To Ship Packages Within D Days	Binary Search	Medium	C++
1012	Numbers With Repeated Digits	DP, Math	Hard	C++
1017	Convert to Base -2	Math	Medium	C++
1019	Next Greater Node In Linked List	Monotonic Stack	Medium	C++
1020	Number of Enclaves	DFS, BFS, Union Find	Medium	C++
1023	Camelcase Matching	Two Pointers, Trie	Medium	C++
1026	Maximum Difference Between Node and Ancestor	DFS	Medium	C++
1032	Stream of Characters	Trie	Hard	C++
1039	Minimum Score Triangulation of Polygon	DP	Medium	C++
1040	Moving Stones Until Consecutive II	Two Pointers	Medium	C++
1041	Robot Bounded In Circle	Math, Simulation	Medium	C++
1042	Flower Planting With No Adjacent	DFS, BFS	Medium	C++
1047	Remove All Adjacent Duplicates In String	Stack	Easy	C++
1048	Longest String Chain	DP, Two Pointers	Medium	C++
1053	Previous Permutation With One Swap	Greedy	Medium	C++
1059	All Paths from Source Lead to Destination	DFS, BFS, Graph	Medium	C++
1061	Lexicographically Smallest Equivalent String	Union Find	Medium	C++
1071	Greatest Common Divisor of Strings	Math, String	Easy	C++
1074	Number of Submatrices That Sum to Target	Hash, Prefix Sum	Hard	C++
1081	Smallest Subsequence of Distinct Characters	Greedy, Monotonic Stack	Medium	C++(Same with 316)
1091	Shortest Path in Binary Matrix	BFS	Medium	C++
1092	Shortest Common Supersequence	DP	Hard	C++
1096	Brace Expansion II	BFS, Backtracking	Hard	C++
1106	Parsing A Boolean Expression	Stack	Hard	C++
1110	Delete Nodes And Return Forest	Binary Tree	Medium	C++
1124	Longest Well-Performing Interval	Prefix Sum, Monotonic Stack	Medium	C++
1125	Smallest Sufficient Team	DP, Bitmask	Hard	C++
1129	Shortest Path with Alternating Colors	BFS	Medium	C++
1135	Connecting Cities With Minimum Cost	Minimum spanning tree	Medium	C++
1137	N-th Tribonacci Number	Simulation, DP	Easy	C++
1138	Alphabet Board Path	Hash	Medium	C++
1139	Largest 1-Bordered Square	DP, Prefix Sum	Medium	C++
1140	Stone Game II	DP	Medium	C++
1143	Longest Common Subsequence	DP	Medium	C++
1144	Decrease Elements To Make Array Zigzag	Greedy	Medium	C++
1145	Binary Tree Coloring Game	DFS	Medium	C++
1147	Longest Chunked Palindrome Decomposition	Greedy, Two Pointers, Rolling Hash, DP	Hard
1155	Number of Dice Rolls With Target Sum	DP	Medium	C++
1162	As Far from Land as Possible	DP, BFS	Medium	C++
1202	Smallest String With Swaps	Union Find	Medium	C++
1207	Unique Number of Occurrences	Hash	Easy	C++
1209	Remove All Adjacent Duplicates in String II	Stack, String	Medium	C++
1210	Minimum Moves to Reach Target with Rotations	BFS	Hard	C++
1220	Count Vowels Permutation	DP	Hard	C++
1223	Dice Roll Simulation	DP	Hard	C++
1224	Maximum Equal Frequency	Hash	Hard	C++
1233	Remove Sub-Folders from the Filesystem	Trie, Sort	Medium	C++
1234	Replace the Substring for Balanced String	Sliding Window	Medium	C++
1235	Maximum Profit in Job Scheduling	Interval, DP	Hard	C++
1237	Find Positive Integer Solution for a Given Equation	Binary Search, Two Pointers	Medium	C++
1238	Circular Permutation in Binary Representation	Backtracking	Medium	C++
1239	Maximum Length of a Concatenated String with Unique Characters	Bit, Backtracking	Medium	C++
1247	Minimum Swaps to Make Strings Equal	Greedy	Medium	C++
1250	Check If It Is a Good Array	Math, Number Theory	Hard	C++
1254	Number of Closed Islands	DFS, BFS, Union Find	Medium	C++
1255	Maximum Score Words Formed by Letters	Backtracking, Bit	Hard	C++
1263	Minimum Moves to Move a Box to Their Target Location	BFS	Hard	C++
1268	Search Suggestions System	Trie, Binary Search	Medium	C++
1282	Group the People Given the Group Size They Belong To	Hash, Simulation	Medium	C++
1293	Shortest Path in a Grid with Obstacles Elimination	BFS	Hard	C++
1302	Deepest Leaves Sum	BFS	Medium	C++
1319	Number of Operations to Make Network Connected	BFS, DFS, Union Find	Medium	C++
1323	Maximum 69 Number	Greedy	Easy	C++
1326	Minimum Number of Taps to Open to Water a Garden	Greedy	Hard	C++
1328	Break a Palindrome	Greedy	Medium	C++
1329	Sort the Matrix Diagonally	Sort	Medium	C++
1332	Remove Palindromic Subsequences	Two Pointers, Simulation	Easy	C++
1334	Find the City With the Smallest Number of Neighbors at a Threshold Distance	Floyd	Medium	C++
1338	Reduce Array Size to The Half	Sort, Hash, Heap	Medium	C++
1339	Maximum Product of Splitted Binary Tree	DFS	Medium	C++
1342	Number of Steps to Reduce a Number to Zero	Bit	Easy	C++
1345	Jump Game IV	BFS, Hash	Hard	C++
1354	Construct Target Array With Multiple Sums	Heap	Hard	C++
1371	Find the Longest Substring Containing Vowels in Even Counts	Prefix Sum, XOR, Hash	Medium	C++
1374	Generate a String With Characters That Have Odd Counts	String	Easy	C++
1383	Maximum Performance of a Team	Greedy, Heap	Hard	C++
1396	Design Underground System	Hash, Design	Medium	C++
1402	Reducing Dishes	DP, Greedy	Hard	C++
1403	Minimum Subsequence in Non-Increasing Order	Greedy	Easy	C++
1408	String Matching in an Array	String Matching	Easy	C++
1413	Minimum Value to Get Positive Step by Step Sum	Prefix Sum	Easy	C++
1417	Reformat The String	String	Easy	C++
1422	Maximum Score After Splitting a String	String	Easy	C++
1423	Maximum Points You Can Obtain from Cards	Sliding Window, Prefix	Medium	C++
1441	Build an Array With Stack Operations	Stack, Simulation	Medium	C++
1443	Minimum Time to Collect All Apples in a Tree	DFS, BFS, Hash	Medium	C++
1444	Number of Ways of Cutting a Pizza	DP,Memoization	Hard	C++
1448	Count Good Nodes in Binary Tree	DFS	Medium	C++
1450	Number of Students Doing Homework at a Given Time	Interval	Easy	C++
1455	Check If a Word Occurs As a Prefix of Any Word in a Sentence	String Match	Easy	C++
1457	Pseudo-Palindromic Paths in a Binary Tree	DFS	Medium	C++
1460	Make Two Arrays Equal by Reversing Sub-arrays	Hash, Sort	Easy	C++
1461	Check If a String Contains All Binary Codes of Size K	Bit, Hash	Medium	C++
1462	Course Schedule IV	Topological Sort	Medium	C++
1464	Maximum Product of Two Elements in an Array	Array	Easy	C++
1465	Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts	Greedy	Medium	C++
1466	Reorder Routes to Make All Paths Lead to the City Zero	DFS, BFS	Medium	C++
1470	Shuffle the Array	Bit, Two Pointers	Easy	C++
1472	Design Browser History	Stack, Double Linked List	Medium	C++
1473	Paint House III	DP	Hard	C++
1475	Final Prices With a Special Discount in a Shop	Monotonic Stack	Easy	C++
1478	Allocate Mailboxes	DP, Distance	Hard	C++
1480	Running Sum of 1d Array	Prefix Sum	Easy	C++
1487	Making File Names Unique	Hash	Medium	C++
1514	Path with Maximum Probability	SPFA	Medium	C++
1519	Number of Nodes in the Sub-Tree With the Same Label	DFS	Medium	C++
1523	Count Odd Numbers in an Interval Range	Math	Easy	C++
1531	String Compression II	DP	Hard	C++
1539	Kth Missing Positive Number	Binary Search	Easy	C++
1542	Find Longest Awesome Substring	Prefix Sum, XOR, Hash	Hard	C++
1544	Make The String Great	Stack	Easy	C++
1574	Shortest Subarray to be Removed to Make Array Sorted	Two Pointers, Binary Search	Medium	C++
1578	Minimum Time to Make Rope Colorful	Greedy	Medium	C++
1582	Special Positions in a Binary Matrix	Simulation	Easy	C++
1584	Min Cost to Connect All Points	Minimum Spanning Tree, Union Find	Medium	C++
1590	Make Sum Divisible by P	Prefix Sum	Medium	C++
1592	Rearrange Spaces Between Words	String	Easy	C++
1598	Crawler Log Folder	Stack, Simulation	Easy	C++
1599	Maximum Profit of Operating a Centennial Wheel	Simulation	Medium	C++
1604	Alert Using Same Key-Card Three or More Times in a One Hour Period	Sort, Hash	Medium	C++
1605	Find Valid Matrix Given Row and Column Sums	Greedy	Medium	C++
1608	Special Array With X Elements Greater Than or Equal X	Binary Search, Sort	Easy	C++
1615	Maximal Network Rank	graph	Medium	C++
1616	Split Two Strings to Make Palindrome	Two Pointers	Medium	C++
1617	Count Subtrees With Max Distance Between Cities	DP, Bit	Hard	C++
1619	Mean of Array After Removing Some Elements	Sort	Easy	C++
1620	Coordinate With Maximum Network Quality	Enumeration	Medium	C++
1624	Largest Substring Between Two Equal Characters	Hash	Easy	C++
1625	Lexicographically Smallest String After Applying Operations	BFS, Enumeration	Medium	C++
1626	Best Team With No Conflicts	DP, Sort	Medium	C++
1630	Arithmetic Subarrays	Math	Medium	C++
1631	Path With Minimum Effort	Disjoint Union Set, BFS, DFS, Binary Search	Medium	C++
1632	Rank Transform of a Matrix	Topological Sort, Union Find	Hard	C++
1636	Sort Array by Increasing Frequency	Hash, Sort	Easy	C++
1637	Widest Vertical Area Between Two Points Containing No Points	Sort	Medium	C++
1638	Count Substrings That Differ by One Character	DP, Hash	Medium	C++
1640	Check Array Formation Through Concatenation	Hash	Easy	C++
1641	Count Sorted Vowel Strings	DP	Medium	C++
1642	Furthest Building You Can Reach	Heap	Medium	C++
1647	Minimum Deletions to Make Character Frequencies Unique	Greedy	Medium	C++
1652	Defuse the Bomb	Simulation	Easy	C++
1653	Minimum Deletions to Make String Balanced	DP, Stack	Medium	C++
1656	Design an Ordered Stream	Hash	Easy	C++
1657	Determine if Two Strings Are Close	Hash	Medium	C++
1658	Minimum Operations to Reduce X to Zero	Prefi9x Sum	Medium	C++
1662	Check If Two String Arrays are Equivalent	String	Easy	C++
1663	Smallest String With A Given Numeric Value	Greedy	Medium	C++
1664	Ways to Make a Fair Array	Prefix Sum, DP	Medium	C++
1668	Maximum Repeating Substring	DP, Greedy	Easy	C++
1669	Merge In Between Linked Lists	Linked List	Medium	C++
1673	Find the Most Competitive Subsequence	Greedy, Monotonic Stack	Medium	C++
1675	Minimize Deviation in Array	Greedy, Heap	Hard	C++
1678	Goal Parser Interpretation	String	Easy	C++
1679	Max Number of K-Sum Pairs	Hash, Two Pointers	Medium	C++
1680	Concatenation of Consecutive Binary Numbers	Bit	Medium	C++
1684	Count the Number of Consistent Strings	Hash, Bit	Easy	C++
1687	Delivering Boxes from Storage to Ports	DP, Segment Tree, Heap	Hard	C++
1689	Partitioning Into Minimum Number Of Deci-Binary Numbers	Greedy	Medium	C++
1691	Maximum Height by Stacking Cuboids	DP	Hard	C++
1694	Reformat Phone Number	String	Easy	C++
1695	Maximum Erasure Value	Two Pointers	Medium	C++
1696	Jump Game VI	DP, Monotonic Stack, Heap	Medium	C++
1697	Checking Existence of Edge Length Limited Paths	Union Find, Sort	Hard	C++
1700	Number of Students Unable to Eat Lunch	Simulation	Easy	C++
1703	Minimum Adjacent Swaps for K Consecutive Ones	Math, Distance	Hard	C++
1704	Determine if String Halves Are Alike	Counting	Easy	C++
1706	Where Will the Ball Fall	Simulation, DP, DFS	Medium	C++
1710	Maximum Units on a Truck	Greedy	Easy	C++
1732	Find the Highest Altitude	Prefix Sum	Easy	C++
1739	Building Boxes	Math, Greedy	Hard	C++
1742	Maximum Number of Balls in a Box	Simulation	Easy	C++
1750	Minimum Length of String After Deleting Similar Ends	Two Pointers	Medium	C++
1751	Maximum Number of Events That Can Be Attended II	Binary Search, Interval	Hard	C++
1752	Check if Array Is Sorted and Rotated	Array	Easy	C++
1753	Maximum Score From Removing Stones	Greedy, Math	Medium	C++
1754	Largest Merge Of Two Strings	Two Pointers, Greedy	Medium	C++
1755	Closest Subsequence Sum	Bit Mask, Two Parts	Hard	C++
1758	Minimum Changes To Make Alternating Binary String	String	Easy	C++
1759	Count Number of Homogenous Substrings	String	Medium	C++
1760	Minimum Limit of Balls in a Bag	Binary Search	Medium	C++
1764	Form Array by Concatenating Subarrays of Another Array	String Matching, Greedy	Medium	C++
1768	Merge Strings Alternately	Two Pointers	Easy	C++
1769	Minimum Number of Operations to Move All Balls to Each Box	Prefix Sum	Medium	C++
1770	Maximum Score from Performing Multiplication Operations	DP	Medium	C++
1773	Count Items Matching a Rule	String	Easy	C++
1774	Closest Dessert Cost	Backtracking, DP	Medium	C++
1775	Equal Sum Arrays With Minimum Number of Operations	Hash, Greedy	Medium	C++
1779	Find Nearest Point That Has the Same X or Y Coordinate	Array	Easy	C++
1780	Check if Number is a Sum of Powers of Three	Math	Medium	C++
1781	Sum of Beauty of All Substrings	Hash	Medium	C++
1784	Check if Binary String Has at Most One Segment of Ones	Simulation	Easy	C++
1785	Minimum Elements to Add to Form a Given Sum	Greedy	Medium	C++
1790	Check if One String Swap Can Make Strings Equal	Simulation	Easy	C++
1792	Maximum Average Pass Ratio	Heap	Medium	C++
1796	Second Largest Digit in a String	Hash	Easy	C++
1797	Design Authentication Manager	Hash	Medium	C++
1798	Maximum Number of Consecutive Values You Can Make	Greedy	Medium	C++
1799	Maximize Score After N Operations	DP, Bit	Hard	C++
1800	Maximum Ascending Subarray Sum	DP	Easy	C++
1801	Number of Orders in the Backlog	Heap	Medium	C++
1802	Maximum Value at a Given Index in a Bounded Array	Binary Search	Medium	C++
1803	Count Pairs With XOR in a Range	Trie	Hard	C++
1805	Number of Different Integers in a String	Hash	Easy	C++
1806	Minimum Number of Operations to Reinitialize a Permutation	Math, Simulation	Medium	C++
1807	Evaluate the Bracket Pairs of a String	Hash	Medium	C++
1812	Determine Color of a Chessboard Square	Math	Easy	C++
1813	Sentence Similarity III	Two Pointers	Medium	C++
1814	Count Nice Pairs in an Array	Hash	Medium	C++
1815	Maximum Number of Groups Getting Fresh Donuts	DP, Greedy, Bit	Hard	C++
1817	Finding the Users Active Minutes	Hash	Medium	C++
1818	Minimum Absolute Sum Difference	Binary Search	Medium	C++
1819	Number of Different Subsequences GCDs	Math	Hard	C++
1822	Sign of the Product of an Array	Array	Easy	C++
1824	Minimum Sideway Jumps	DP, Greedy	Medium	C++
1825	Finding MK Average	Queue, Heap, Ordered Set	Hard	C++
1827	Minimum Operations to Make the Array Increasing	Greedy	Easy	C++
1828	Queries on Number of Points Inside a Circle	Math	Medium	C++
1832	Check if the Sentence Is Pangram	Hash	Easy	C++
1833	Maximum Ice Cream Bars	Greedy	Medium	C++
1834	Single-Threaded CPU	Heap	Medium	C++
1857	Largest Color Value in a Directed Graph	DP, Topological Sort	Hard	C++
1870	Minimum Speed to Arrive on Time	Binary Search	Medium	C++
1918*	Kth Smallest Subarray Sum lintcode	Binary Search	Medium	C++
1926	Nearest Exit from Entrance in Maze	BFS	Medium	C++
1945	Sum of Digits of String After Convert	Simulation	Easy	C++
1962	Remove Stones to Minimize the Total	Heap	Medium	C++
1971	Find if Path Exists in Graph	BFS, DFS, Union Find	Easy	C++
1996	The Number of Weak Characters in the Game	Greedy, Sort, Monotonic Stack	Medium	C++
2007	Find Original Array From Doubled Array	Hash, Greedy, Sort	Medium	C++
2008	Maximum Earnings From Taxi	Binary Search, Interval	Medium	C++
2011	Final Value of Variable After Performing Operations	String	Easy	C++
2024	Maximize the Confusion of an Exam	Two Pointers, Prefix um	Medium	C++
2027	Minimum Moves to Convert String	Greedy	Easy	C++
2029	Stone Game IX	Greedy, Game Theory	Medium	C++
2030	Smallest K-Length Subsequence With Occurrences of a Letter	Greedy, Monotonic Stack	Hard	C++
2032	Two Out of Three	Hash	Easy	C++
2033	Minimum Operations to Make a Uni-Value Grid	Math	Medium	C++
2035	Partition Array Into Two Arrays to Minimize Sum Difference	Bit Mask, Two Parts	Hard	C++
2037	Minimum Number of Moves to Seat Everyone	Greedy, Sort	Easy	C++
2040	Kth Smallest Product of Two Sorted Arrays	Binary Search	Hard	C++
2042	Check if Numbers Are Ascending in a Sentence	String	Easy	C++
2044	Count Number of Maximum Bitwise-OR Subsets	Dynamic Programming	Medium	C++
2045	Second Minimum Time to Reach Destination	BFS	Hard	C++
2049	Count Nodes With the Highest Score	Binary Tree	Medium	C++
2050	Parallel Courses III	Topological Sort	Hard	C++
2054	Two Best Non-Overlapping Events	Heap, Greedy, Interval	Medium	C++
2055	Plates Between Candles	Greedy, State Machine, Prefix Sum	Medium	C++
2056	Number of Valid Move Combinations On Chessboard	DFS	Hard	C++
2060	Check if an Original String Exists Given Two Encoded Strings	Recursion	Hard	C++
2064	Minimized Maximum of Products Distributed to Any Store	Binary Search	Medium	C++
2065	Maximum Path Quality of a Graph	DFS	Hard	C++
2095	Delete the Middle Node of a Linked List	Two Pointers	Medium	C++
2131	Longest Palindrome by Concatenating Two Letter Words	Hash, Greedy	Medium	C++
2136	Earliest Possible Day of Full Bloom	Greedy	Hard	C++
2180	Count Integers With Even Digit Sum	Simulation, Math	Easy	C++
2185	Counting Words With a Given Prefix	String	Easy	C++
2187	Minimum Time to Complete Trips	Binary Search	Medium	C++
2218	Maximum Value of K Coins From Piles	DP, Prefix Sum	Hard	C++
2225	Find Players With Zero or One Losses	Hash	Medium	C++
2244	Minimum Rounds to Complete All Tasks	Greedy, Hash	Medium	C++
2246	Longest Path With Different Adjacent Characters	DFS, Topological Sort	Hard	C++
2256	Minimum Average Difference	Prefix Sum	Medium	C++
2279	Maximum Bags With Full Capacity of Rocks	Greedy	Medium	C++
2283	Check if Number Has Equal Digit Count and Digit Value	Hash	Easy	C++
2287	Rearrange Characters to Make Target String	Hash	Easy	C++
2293	Min Max Game	Simulation	Easy	C++
2299	Strong Password Checker II	String	Easy	C++
2300	Successful Pairs of Spells and Potions	Binary Search	Medium	C++
2303	Calculate Amount Paid in Taxes	Simulation	Easy	C++
2306	Naming a Company	Hash, Bit, Enumeration	Hard	C++
2309	Greatest English Letter in Upper and Lower Case	Hash	Easy	C++
2315	Count Asterisks	String	Easy	C++
2316	Count Unreachable Pairs of Nodes in an Undirected Graph	BFS, DFS, Union Find	Medium	C++
2319	Check if Matrix Is X-Matrix	Matrix	Easy	C++
2325	Decode the Message	Hash	Easy	C++
2331	Evaluate Boolean Binary Tree	DFS	Easy	C++
2335	Minimum Amount of Time to Fill Cups	Greedy	Easy	C++
2336	Smallest Number in Infinite Set	Heap	Medium	C++
2337	Move Pieces to Obtain a String	Two Pointers	Medium	C++
2341	Maximum Number of Pairs in Array	Hash	Easy	C++
2347	Best Poker Hand	Hash	Easy	C++
2348	Number of Zero-Filled Subarrays	Math	Medium	C++
2351	First Letter to Appear Twice	Hash, Count	Easy	C++
2352	Equal Row and Column Pairs	Hash, Simulation	Medium	C++
2353	Design a Food Rating System	Hash, Ordered Set, Heap	Medium	C++
2354	Number of Excellent Pairs	Bit, Binary Search, Prefix Sum	Hard	C++
2357	Make Array Zero by Subtracting Equal Amounts	Hash	Easy	C++
2359	Find Closest Node to Given Two Nodes	DFS	Medium	C++
2360	Longest Cycle in a Graph	DFS, Topological Sort	Hard	C++
2363	Merge Similar Items	Hash, Ordered Set	Easy	C++
2367	Number of Arithmetic Triplets	Hash, Two Pointers	Easy	C++
2373	Largest Local Values in a Matrix	Matrix	Easy	C++
2376	Count Special Integers	DP, Combinatorics	Hard	C++
2379	Minimum Recolors to Get K Consecutive Black Blocks	Sliding Window	Easy	C++
2383	Minimum Hours of Training to Win a Competition	Greedy	Easy	C++
2389	Longest Subsequence With Limited Sum	Binary Search, Prefix Sum	Easy	C++
2390	Removing Stars From a String	Stack	Medium	C++
2395	Find Subarrays With Equal Sum	Hash	Easy	C++
2397	Maximum Rows Covered by Columns	Bit	Medium	C++
2399	Check Distances Between Same Letters	Hash	Easy	C++
2402	Meeting Rooms III	Heap	Hard	C++
2404	Most Frequent Even Element	Hash	Easy	C++
2405	Optimal Partition of String	Hash	Medium	C++
2406	Divide Intervals Into Minimum Number of Groups	Greedy, Heap	Medium	C++
2421	Number of Good Paths	Union Find	Hard	C++
2427	Number of Common Factors	Math	Easy	C++
2434	Using a Robot to Print the Lexicographically Smallest String	Stack, Greedy	Medium	C++
2435	Paths in Matrix Whose Sum Is Divisible by K	DP	Hard	C++
2439	Minimize Maximum of Array	DP, Greedy, Binary Search	Medium	C++
2444	Count Subarrays With Fixed Bounds	Two Pointers	Hard	C++
2447	Number of Subarrays With GCD Equal to K	Math	Medium	C++
2448	Minimum Cost to Make Array Equal	Math	Hard	C++
2463	Minimum Total Distance Traveled	DP	Hard	C++
2469	Convert the Temperature	Math	Easy	C++
2477	Minimum Fuel Cost to Report to the Capital	BFS, DFS	Medium	C++
2478	Number of Beautiful Partitions	DP	Hard	C++
2488	Count Subarrays With Median K	Prefix Sum, Hash	Hard	C++
2492	Minimum Score of a Path Between Two Cities	BFS, DFS, Union Find	Medium	C++
2493	Divide Nodes Into the Maximum Number of Groups	Bipartite, DFS, BFS	Hard	C++
2503	Maximum Number of Points From Grid Queries	Heap, Union Find, BFS	Hard	C++
2508	Add Edges to Make Degrees of All Nodes Even	Math	Hard	C++
2516	Take K of Each Character From Left and Right	Two Pointers	Medium	C++
2517	Maximum Tastiness of Candy Basket	Binary Search	Medium	C++
2528	Maximize the Minimum Powered City	Binary Search, Greedy, Difference Array	Hard	C++
2532	Time to Cross a Bridge	Heap, Simulation	Hard	C++
2538	Difference Between Maximum and Minimum Price Sum	DFS, DP	Hard	C++
2552	Count Increasing Quadruplets	DP, Binary Indexed Tree, Enumeration, Prefix Sum	Hard	C++
2560	House Robber IV	DP, Binary Search	Medium	C++
2561	Rearranging Fruits	Greedy, Hash	Hard	C++
2565	Subsequence With the Minimum Score	Prefix, Suffix	Hard	C++
2573	Find the String with LCP	Greedy, DP	Hard	C++
2576	Find the Maximum Number of Marked Indices	Binary Search, Greedy, Two Pointers	Medium	C++
2585	Number of Ways to Earn Points	DP	Hard	C++
2597	The Number of Beautiful Subsets	DP, Backtracking	Medium	C++
2603	Collect Coins in a Tree	Topological Sort, DP	Hard	C++
2607	Make K-Subarray Sums Equal	Bézout's lemma, Greedy	Medium	C++

2. 剑指Offer

官方参考源代码 link

leetcode lcof

ID	Title	C++ countExcellentPairs
03	数组中重复的数字	C++
04	二维数组中的查找	C++
07	重建二叉树	C++
09	用两个栈实现队列	C++
12	矩阵中的路径	C++
13	机器人的运动范围	C++
14	剪绳子I	C++
14.2	剪绳子 II	C++
16	数值的整数次方	C++
19	正则表达式匹配	C++
20	表示数值的字符串	C++
21	调整数组顺序使奇数位于偶数前面	C++
22	链表中倒数第k个节点	C++
26	树的子结构	C++
27	二叉树的镜像	C++
29	顺时针打印矩阵	C++
30	包含min函数的栈	C++
31	栈的压入、弹出序列	C++
32-I	I. 从上到下打印二叉树	C++
32-II	II. 从上到下打印二叉树 II	C++
33	二叉搜索树的后序遍历序列	C++
34	二叉树中和为某一值的路径	C++
35	复杂链表的复制	C++
36	二叉搜索树与双向链表	C++
37	序列化二叉树	C++
38	字符串的排列	C++
39	数组中出现次数超过一半的数字	C++
40	最小的k个数	C++
41	数据流中的中位数	C++
42	连续子数组的最大和	C++
43	1～n 整数中 1 出现的次数	C++
44	数字序列中某一位的数字	C++
45	把数组排成最小的数	C++
46	把数字翻译成字符串	C++
47	礼物的最大价值	C++
48	最长不含重复字符的子字符串	C++
49	丑数	C++
50	第一个只出现一次的字符	C++
51	数组中的逆序对	C++
52	两个链表的第一个公共节点	C++
53-II	0～n-1中缺失的数字	C++
54	二叉搜索树的第k大节点	C++
55-I	二叉树的深度	C++
55-II	平衡二叉树	C++
56-I	数组中数字出现的次数	C++
56-II	数组中数字出现的次数 II	C++
57	和为s的两个数字	C++
57-II	和为s的连续正数序列	C++
58-I	翻转单词顺序	C++
58-II	左旋转字符串	C++
59-I	滑动窗口的最大值	C++
59-II	队列的最大值	C++
60	n个骰子的点数	C++
61	扑克牌中的顺子	C++
62	圆圈中最后剩下的数字	C++
63	股票的最大利润	C++
64	求1+2+…+n	C++
66	构建乘积数组	C++
67	把字符串转换成整数	C++
68-I	二叉搜索树的最近公共祖先	C++
68-II	二叉树的最近公共祖先	C++

3. Interview

Title	C++
扑克牌大小	poker.cpp
求大于某值的最小的不重复数	nonRepeat.cpp

4. 程序员面试金典

Title	Category	C++
面试题 01.02. 判定是否互为字符重排	Hash	C++
面试题 01.08. 零矩阵	Hash	C++
面试题 01.09. 字符串轮转	KMP	C++
面试题 05.02. 二进制数转字符串	Bit	C++
面试题 17.05. 字母与数字	Prefix Sum, Hash	C++
面试题 17.09. 第 k 个数	DP, Heap	C++
面试题 17.19. 消失的两个数字	Bit	C++