LeetCode

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Template

• Tree
• LinkedList
• Stack
• Array

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• TwoPointer

• Bit

• Bfs

• Stack

• Enum

• Tree

• Divide&conquer

• Back

• Sort

• Search

• LinkedList

• BinarySearch

• Catalan

• StackMonotonic

• SortCounter

• Hash

• Greedy

• Dp

• Classic

• Math

• Sql

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TwoPointer

#	Title	Acceptance	Difficulty	Solution	Algorithm
0003	Longest Substring Without Repeating Characters	37.9%	Medium	Go
0019	Remove Nth Node From End of List	42.8%	Medium	Go
0027	Remove Element	59.8%	Easy	Go
0030	Substring with Concatenation of All Words	35.6%	Hard	Go
0042	Trapping Rain Water	57.5%	Hard	Go
0075	Sort Colors	59.4%	Medium	Go
0080	Remove Duplicates from Sorted Array II	61.6%	Medium	Go
0443	String Compression	47.7%	Medium	Go
0930	Binary Subarrays With Sum	54.5%	Medium	Go
1790	Check if One String Swap Can Make Strings Equal	65.1%	Easy	Go

Bit

#	Title	Acceptance	Difficulty	Solution	Algorithm
0168	Excel Sheet Column Title	43.3%	Easy	Go
0231	Power of Two	50.3%	Easy	Go
0342	Power of Four	51.6%	Easy	Go
0401	Binary Watch	61.4%	Easy	Go
0461	Hamming Distance	81.2%	Easy	Go
0477	Total Hamming Distance	60.4%	Medium	Go
1689	Partitioning Into Minimum Number Of Deci-Binary Numbers	87.0%	Medium	Go
0000	[er-jin-zhi-zhong-1de-ge-shu-lcof 二进制中1的个数](https://leetcode-cn.com/problems/er-jin-zhi-zhong-1de-ge-shu-lcof 二进制中1的个数)	NaN%	Hard	Go

Bfs

#	Title	Acceptance	Difficulty	Solution	Algorithm
0098	Validate Binary Search Tree	34.9%	Medium	Go
0102	Binary Tree Level Order Traversal	64.2%	Medium	Go
0103	Binary Tree Zigzag Level Order Traversal	57.2%	Medium	Go
0107	Binary Tree Level Order Traversal II	69.5%	Medium	Go
0111	Minimum Depth of Binary Tree	48.4%	Easy	Go
0116	Populating Next Right Pointers in Each Node	70.3%	Medium	Go
0117	Populating Next Right Pointers in Each Node II	61.0%	Medium	Go
0199	Binary Tree Right Side View	65.3%	Medium	Go
0297	Serialize and Deserialize Binary Tree	55.8%	Hard	Go
0428	Serialize and Deserialize N-ary Tree	65.0%	Hard	Go
0429	N-ary Tree Level Order Traversal	69.8%	Medium	Go
0513	Find Bottom Left Tree Value	73.1%	Medium	Go
0515	Find Largest Value in Each Tree Row	64.3%	Medium	Go
0559	Maximum Depth of N-ary Tree	72.7%	Easy	Go
0623	Add One Row to Tree	54.6%	Medium	Go
0637	Average of Levels in Binary Tree	68.9%	Easy	Go
1161	Maximum Level Sum of a Binary Tree	63.3%	Medium	Go
1306	Jump Game III	57.7%	Medium	Go

Stack

#	Title	Acceptance	Difficulty	Solution	Algorithm
0020	Valid Parentheses	44.5%	Easy	Go
0032	Longest Valid Parentheses	35.6%	Hard	Go
0071	Simplify Path	42.1%	Medium	Go
0084	Largest Rectangle in Histogram	43.3%	Hard	Go
0085	Maximal Rectangle	51.6%	Hard	Go
0094	Binary Tree Inorder Traversal	75.6%	Easy	Go
0103	Binary Tree Zigzag Level Order Traversal	57.2%	Medium	Go
0144	Binary Tree Preorder Traversal	70.3%	Easy	Go
0145	Binary Tree Postorder Traversal	74.9%	Easy	Go
0150	Evaluate Reverse Polish Notation	53.7%	Medium	Go
0155	Min Stack	57.2%	Easy	Go
0224	Basic Calculator	41.8%	Hard	Go
0225	Implement Stack using Queues	67.6%	Easy	Go
0227	Basic Calculator II	43.7%	Medium	Go
0232	Implement Queue using Stacks	69.1%	Easy	Go
0255	Verify Preorder Sequence in Binary Search Tree	47.2%	Medium	Go
0272	Closest Binary Search Tree Value II	64.5%	Hard	Go
0316	Remove Duplicate Letters	47.7%	Medium	Go
0331	Verify Preorder Serialization of a Binary Tree	48.0%	Medium	Go
0341	Flatten Nested List Iterator	72.7%	Medium	Go
0385	Mini Parser	41.5%	Medium	Go
0394	Decode String	55.1%	Medium	Go
0402	Remove K Digits	32.8%	Medium	Go
0430	Flatten a Multilevel Doubly Linked List	54.1%	Medium	Go
0439	Ternary Expression Parser	58.9%	Medium	Go
0445	Add Two Numbers II	58.8%	Medium	Go
0456	132 Pattern	36.3%	Medium	Go
0496	Next Greater Element I	68.8%	Easy	Go
0503	Next Greater Element II	63.4%	Medium	Go
0591	Tag Validator	34.0%	Hard	Go
0636	Exclusive Time of Functions	54.9%	Medium	Go
0726	Number of Atoms	55.5%	Hard	Go
0735	Asteroid Collision	41.1%	Medium	Go
0739	Daily Temperatures	67.8%	Medium	Go
0772	Basic Calculator III	49.0%	Hard	Go
0844	Backspace String Compare	51.5%	Easy	Go
0856	Score of Parentheses	62.5%	Medium	Go
0880	Decoded String at Index	25.2%	Medium	Go
0895	Maximum Frequency Stack	54.1%	Hard	Go
0901	Online Stock Span	54.2%	Medium	Go
0921	Minimum Add to Make Parentheses Valid	73.5%	Medium	Go
0946	Validate Stack Sequences	62.2%	Medium	Go
1003	Check If Word Is Valid After Substitutions	57.6%	Medium	Go
1019	Next Greater Node In Linked List	59.7%	Medium	Go
1081	Smallest Subsequence of Distinct Characters	57.1%	Medium	Go
1190	Reverse Substrings Between Each Pair of Parentheses	65.1%	Medium	Go
1544	Make The String Great	54.4%	Easy	Go
1598	Crawler Log Folder	67.1%	Easy	Go

Enum

#	Title	Acceptance	Difficulty	Solution	Algorithm
0002	Add Two Numbers	40.8%	Medium	Go
0006	ZigZag Conversion	50.6%	Medium	Go
0014	Longest Common Prefix	40.7%	Easy	Go
0036	Valid Sudoku	62.9%	Medium	Go
0038	Count and Say	58.0%	Medium	Go
0041	First Missing Positive	41.9%	Hard	Go
0121	Best Time to Buy and Sell Stock	57.3%	Easy	Go
0122	Best Time to Buy and Sell Stock II	68.7%	Medium	Go
0171	Excel Sheet Column Number	71.7%	Easy	Go
1213	Intersection of Three Sorted Arrays	77.2%	Easy	Go
1295	Find Numbers with Even Number of Digits	80.9%	Easy	Go
1389	Create Target Array in the Given Order	83.1%	Easy	Go
1503	Last Moment Before All Ants Fall Out of a Plank	51.2%	Medium	Go
1646	Get Maximum in Generated Array	53.8%	Easy	Go
1672	Richest Customer Wealth	85.0%	Easy	Go

Tree

#	Title	Acceptance	Difficulty	Solution	Algorithm
0022	Generate Parentheses	77.3%	Medium	Go	dfs.catalan
				Go	dfs.recursive
0039	Combination Sum	72.7%	Medium	Go	dfs.recursive
0040	Combination Sum II	62.8%	Medium	Go	dfs.recursive
0094	Binary Tree Inorder Traversal	75.6%	Easy	Go	dfs.inorder.recursive
				Go	dfs.inorder.stack
				Go	dfs.morris.break
				Go	dfs.morris.keep
0095	Unique Binary Search Trees II	69.9%	Medium	Go	dfs.catalan
0096	Unique Binary Search Trees	69.9%	Medium	Go	catalan
				Go	dp
0098	Validate Binary Search Tree	34.9%	Medium	Go	dfs.inorder.recursive
				Go	dfs.inorder.stack
				Go	dfs.preorder.recursive
				Go	dfs.preorder.stack
0099	Recover Binary Search Tree	61.5%	Medium	Go	dfs.inorder.recursive
				Go	dfs.inorder.stack
				Go	dfs.morris
0100	Same Tree	60.4%	Easy	Go	dfs.recursive
0101	Symmetric Tree	56.1%	Easy	Go	dfs.recursive
0102	Binary Tree Level Order Traversal	64.2%	Medium	Go	dfs.recursive
0103	Binary Tree Zigzag Level Order Traversal	57.2%	Medium	Go	dfs.recursive
0104	Maximum Depth of Binary Tree	76.6%	Easy	Go	dfs
0105	Construct Binary Tree from Preorder and Inorder Traversal	70.4%	Medium	Go
0106	Construct Binary Tree from Inorder and Postorder Traversal	72.1%	Medium	Go
0107	Binary Tree Level Order Traversal II	69.5%	Medium	Go	dfs.recursive
0108	Convert Sorted Array to Binary Search Tree	75.9%	Easy	Go	dfs.recursive
0109	Convert Sorted List to Binary Search Tree	76.4%	Medium	Go	array
				Go	inorder
				Go	recursive
0110	Balanced Binary Tree	56.2%	Easy	Go	postorder
				Go	top
0111	Minimum Depth of Binary Tree	48.4%	Easy	Go	dfs
0112	Path Sum	52.6%	Easy	Go	dfs
0113	Path Sum II	62.6%	Medium	Go	dfs
0114	Flatten Binary Tree to Linked List	72.6%	Medium	Go	preorder.morris
0116	Populating Next Right Pointers in Each Node	70.3%	Medium	Go	dfs
0124	Binary Tree Maximum Path Sum	44.3%	Hard	Go	dfs
0129	Sum Root to Leaf Numbers	68.0%	Medium	Go	dfs
0144	Binary Tree Preorder Traversal	70.3%	Easy	Go	dfs.recursive
				Go	dfs.stack
				Go	morris.break
				Go	morris.keep
0145	Binary Tree Postorder Traversal	74.9%	Easy	Go	dfs.recursive
0156	Binary Tree Upside Down	72.6%	Medium	Go	link
0173	Binary Search Tree Iterator	80.3%	Medium	Go
0199	Binary Tree Right Side View	65.3%	Medium	Go	dfs
0222	Count Complete Tree Nodes	78.0%	Medium	Go	dfs
				Go	two pointer
0226	Invert Binary Tree	78.8%	Easy	Go	dfs
0230	Kth Smallest Element in a BST	74.1%	Medium	Go	dfs
0235	Lowest Common Ancestor of a Binary Search Tree	66.6%	Easy	Go	dfs
0236	Lowest Common Ancestor of a Binary Tree	68.0%	Medium	Go	dfs
0250	Count Univalue Subtrees	63.4%	Medium	Go	dfs
0255	Verify Preorder Sequence in Binary Search Tree	47.2%	Medium	Go
0257	Binary Tree Paths	68.0%	Easy	Go	dfs
0270	Closest Binary Search Tree Value	55.0%	Easy	Go
0272	Closest Binary Search Tree Value II	64.5%	Hard	Go
0285	Inorder Successor in BST	63.6%	Medium	Go
0297	Serialize and Deserialize Binary Tree	55.8%	Hard	Go	bfs
				Go	dfs
0298	Binary Tree Longest Consecutive Sequence	57.9%	Medium	Go
0366	Find Leaves of Binary Tree	76.2%	Medium	Go
0404	Sum of Left Leaves	58.2%	Easy	Go	dfs
0426	Convert Binary Search Tree to Sorted Doubly Linked List	66.8%	Medium	Go	inorder
0428	Serialize and Deserialize N-ary Tree	65.0%	Hard	Go	dfs
0437	Path Sum III	56.7%	Medium	Go	dfs
				Go	hash table
0449	Serialize and Deserialize BST	55.5%	Medium	Go	dfs.preorder
0450	Delete Node in a BST	48.5%	Medium	Go	dfs
0501	Find Mode in Binary Search Tree	51.1%	Easy	Go	dfs.recursive
0508	Most Frequent Subtree Sum	67.5%	Medium	Go	dfs
0510	Inorder Successor in BST II	60.9%	Medium	Go
0530	Minimum Absolute Difference in BST	62.1%	Easy	Go	dfs
0538	Convert BST to Greater Tree	69.6%	Medium	Go	dfs
0543	Diameter of Binary Tree	54.9%	Easy	Go	dfs
0559	Maximum Depth of N-ary Tree	72.7%	Easy	Go	dfs
0563	Binary Tree Tilt	60.5%	Easy	Go	dfs
0572	Subtree of Another Tree	47.4%	Easy	Go	dfs
0589	N-ary Tree Preorder Traversal	74.5%	Easy	Go	dfs.recursive
				Go	dfs.stack
0590	N-ary Tree Postorder Traversal	76.0%	Easy	Go	dfs.recursive
				Go	dfs.stack
0606	Construct String from Binary Tree	56.8%	Easy	Go	dfs
0617	Merge Two Binary Trees	78.8%	Easy	Go	dfs.recursive
0653	Two Sum IV - Input is a BST	59.5%	Easy	Go	dfs
0654	Maximum Binary Tree	81.0%	Medium	Go	dfs
0669	Trim a Binary Search Tree	66.7%	Medium	Go	dfs
0671	Second Minimum Node In a Binary Tree	48.7%	Easy	Go	dfs
0687	Longest Univalue Path	44.0%	Medium	Go	dfs
0700	Search in a Binary Search Tree	75.9%	Easy	Go	dfs
0701	Insert into a Binary Search Tree	72.4%	Medium	Go	dfs
0783	Minimum Distance Between BST Nodes	59.6%	Easy	Go	dfs
0814	Binary Tree Pruning	70.0%	Medium	Go	dfs
0865	Smallest Subtree with all the Deepest Nodes	65.4%	Medium	Go
0872	Leaf-Similar Trees	65.2%	Easy	Go	dfs
0889	Construct Binary Tree from Preorder and Postorder Traversal	67.9%	Medium	Go
0897	Increasing Order Search Tree	74.6%	Easy	Go	inorder
0938	Range Sum of BST	81.8%	Easy	Go
0951	Flip Equivalent Binary Trees	66.2%	Medium	Go	dfs
0965	Univalued Binary Tree	68.4%	Easy	Go	dfs
0979	Distribute Coins in Binary Tree	71.2%	Medium	Go	dfs
1008	Construct Binary Search Tree from Preorder Traversal	72.6%	Medium	Go	dfs
1022	Sum of Root To Leaf Binary Numbers	70.2%	Easy	Go	dfs
1026	Maximum Difference Between Node and Ancestor	66.9%	Medium	Go	dfs
1038	Binary Search Tree to Greater Sum Tree	79.3%	Medium	Go	inorder
1104	Path In Zigzag Labelled Binary Tree	76.1%	Medium	Go
1123	Lowest Common Ancestor of Deepest Leaves	70.5%	Medium	Go	dfs
1161	Maximum Level Sum of a Binary Tree	63.3%	Medium	Go	bfs
1302	Deepest Leaves Sum	81.7%	Medium	Go	dfs
1315	Sum of Nodes with Even-Valued Grandparent	81.0%	Medium	Go	dfs
1325	Delete Leaves With a Given Value	72.9%	Medium	Go	postorder
1448	Count Good Nodes in Binary Tree	71.3%	Medium	Go	dfs
1484	Clone Binary Tree With Random Pointer	80.3%	Medium	Go	dfs
1490	Clone N-ary Tree	85.5%	Medium	Go	dfs
1560	Most Visited Sector in a Circular Track	57.4%	Easy	Go	hash
1600	Throne Inheritance	68.2%	Medium	Go
1602	Find Nearest Right Node in Binary Tree	77.9%	Medium	Go	bfs
1669	Merge In Between Linked Lists	76.7%	Medium	Go
1740	Find Distance in a Binary Tree	70.1%	Medium	Go	dfs

Divide&conquer

#	Title	Acceptance	Difficulty	Solution	Algorithm
0014	Longest Common Prefix	40.7%	Easy	Go

Back

#	Title	Acceptance	Difficulty	Solution	Algorithm
0037	Sudoku Solver	67.1%	Hard	Go
0000	0038	NaN%	Hard	Go

Sort

#	Title	Acceptance	Difficulty	Solution	Algorithm
0179	Largest Number	41.0%	Medium	Go

Search

#	Title	Acceptance	Difficulty	Solution	Algorithm
0011	Container With Most Water	63.2%	Medium	Go
0015	3Sum	33.3%	Medium	Go
0016	3Sum Closest	46.0%	Medium	Go
0018	4Sum	40.1%	Medium	Go
0026	Remove Duplicates from Sorted Array	54.0%	Easy	Go
1838	Frequency of the Most Frequent Element	43.1%	Medium	Go
0000	[ 在排序数组中查找数字 I ](https://leetcode-cn.com/problems/ 在排序数组中查找数字 I)	NaN%	Hard	Go

LinkedList

#	Title	Acceptance	Difficulty	Solution	Algorithm
0021	Merge Two Sorted Lists	66.7%	Easy	Go
0023	Merge k Sorted Lists	55.9%	Hard	Go
0024	Swap Nodes in Pairs	70.3%	Medium	Go
0025	Reverse Nodes in k-Group	65.6%	Hard	Go
0061	Rotate List	41.8%	Medium	Go
0082	Remove Duplicates from Sorted List II	52.9%	Medium	Go
0083	Remove Duplicates from Sorted List	53.9%	Easy	Go
0086	Partition List	63.2%	Medium	Go
0092	Reverse Linked List II	54.7%	Medium	Go
0109	Convert Sorted List to Binary Search Tree	76.4%	Medium	Go	array
				Go	inorder
				Go	recursive
0138	Copy List with Random Pointer	65.9%	Medium	Go
0141	Linked List Cycle	51.3%	Easy	Go
0142	Linked List Cycle II	55.2%	Medium	Go
0143	Reorder List	61.7%	Medium	Go
0147	Insertion Sort List	68.1%	Medium	Go
0160	Intersection of Two Linked Lists	61.2%	Easy	Go
0203	Remove Linked List Elements	51.3%	Easy	Go
0206	Reverse Linked List	72.2%	Easy	Go
0234	Palindrome Linked List	49.3%	Easy	Go
0237	Delete Node in a Linked List	84.8%	Easy	Go
0328	Odd Even Linked List	65.7%	Medium	Go
0369	Plus One Linked List	61.7%	Medium	Go
0379	Design Phone Directory	64.6%	Medium	Go
0430	Flatten a Multilevel Doubly Linked List	54.1%	Medium	Go
0445	Add Two Numbers II	58.8%	Medium	Go
0707	Design Linked List	31.8%	Medium	Go
0708	Insert into a Sorted Circular Linked List	33.5%	Medium	Go
0725	Split Linked List in Parts	56.3%	Medium	Go
0817	Linked List Components	59.2%	Medium	Go
0876	Middle of the Linked List	70.7%	Easy	Go
1019	Next Greater Node In Linked List	59.7%	Medium	Go
1171	Remove Zero Sum Consecutive Nodes from Linked List	47.2%	Medium	Go
1290	Convert Binary Number in a Linked List to Integer	80.9%	Easy	Go
1367	Linked List in Binary Tree	41.7%	Medium	Go
1474	Delete N Nodes After M Nodes of a Linked List	72.0%	Easy	Go
1634	Add Two Polynomials Represented as Linked Lists	52.2%	Medium	Go
				Go
1669	Merge In Between Linked Lists	76.7%	Medium	Go
1670	Design Front Middle Back Queue	52.9%	Medium	Go
1721	Swapping Nodes in a Linked List	64.7%	Medium	Go
剑指 Offer II 023	两个链表的第一个重合节点	71.5%	Easy	Go

BinarySearch

#	Title	Acceptance	Difficulty	Solution	Algorithm
0004	Median of Two Sorted Arrays	40.7%	Hard	Go
0014	Longest Common Prefix	40.7%	Easy	Go
0033	Search in Rotated Sorted Array	42.6%	Medium	Go
0034	Find First and Last Position of Element in Sorted Array	42.4%	Medium	Go
0035	Search Insert Position	46.6%	Easy	Go
0278	First Bad Version	45.5%	Easy	Go
0374	Guess Number Higher or Lower	51.4%	Easy	Go
0701	Insert into a Binary Search Tree	72.4%	Medium	Go
0852	Peak Index in a Mountain Array	71.5%	Easy	Go

Catalan

#	Title	Acceptance	Difficulty	Solution	Algorithm
0022	Generate Parentheses	77.3%	Medium	Go

StackMonotonic

#	Title	Acceptance	Difficulty	Solution	Algorithm
0042	Trapping Rain Water	57.5%	Hard	Go

SortCounter

#	Title	Acceptance	Difficulty	Solution	Algorithm
0274	H-Index	44.0%	Medium	Go
0451	Sort Characters By Frequency	71.1%	Medium	Go
1365	How Many Numbers Are Smaller Than the Current Number	82.5%	Easy	Go
1833	Maximum Ice Cream Bars	68.5%	Medium	Go

Hash

#	Title	Acceptance	Difficulty	Solution	Algorithm
0001	Two Sum	51.9%	Easy	Go
0003	Longest Substring Without Repeating Characters	37.9%	Medium	Go
0041	First Missing Positive	41.9%	Hard	Go
0049	Group Anagrams	66.4%	Medium	Go
0170	Two Sum III - Data structure design	41.7%	Easy	Go
0205	Isomorphic Strings	50.1%	Easy	Go
0217	Contains Duplicate	56.1%	Easy	Go
0219	Contains Duplicate II	42.5%	Easy	Go
0242	Valid Anagram	64.4%	Easy	Go
0246	Strobogrammatic Number	47.4%	Easy	Go
0266	Palindrome Permutation	67.1%	Easy	Go
0290	Word Pattern	45.7%	Easy	Go
0349	Intersection of Two Arrays	73.8%	Easy	Go
0350	Intersection of Two Arrays II	55.0%	Easy	Go
0359	Logger Rate Limiter	72.5%	Easy	Go
0383	Ransom Note	59.5%	Easy	Go
0387	First Unique Character in a String	53.1%	Easy	Go
0389	Find the Difference	69.2%	Easy	Go
0409	Longest Palindrome	55.6%	Easy	Go
0448	Find All Numbers Disappeared in an Array	64.7%	Easy	Go
0500	Keyboard Row	70.9%	Easy	Go
0575	Distribute Candies	68.5%	Easy	Go
0594	Longest Harmonious Subsequence	51.6%	Easy	Go
0599	Minimum Index Sum of Two Lists	52.2%	Easy	Go
0604	Design Compressed String Iterator	37.3%	Easy	Go
0657	Robot Return to Origin	78.3%	Easy	Go
0690	Employee Importance	64.6%	Easy	Go
0697	Degree of an Array	60.6%	Easy	Go
0705	Design HashSet	64.7%	Easy	Go
0706	Design HashMap	64.4%	Easy	Go
0720	Longest Word in Dictionary	48.6%	Easy	Go
0734	Sentence Similarity	47.8%	Easy	Go
0748	Shortest Completing Word	59.9%	Easy	Go
0760	Find Anagram Mappings	83.9%	Easy	Go
0771	Jewels and Stones	85.1%	Easy	Go
0811	Subdomain Visit Count	70.3%	Medium	Go
0819	Most Common Word	42.1%	Easy	Go
0859	Buddy Strings	30.2%	Easy	Go
0884	Uncommon Words from Two Sentences	66.1%	Easy	Go
0888	Fair Candy Swap	64.0%	Easy	Go
0914	X of a Kind in a Deck of Cards	38.9%	Easy	Go
0929	Unique Email Addresses	64.3%	Easy	Go
0930	Binary Subarrays With Sum	54.5%	Medium	Go
0953	Verifying an Alien Dictionary	55.3%	Easy	Go
0961	N-Repeated Element in Size 2N Array	67.7%	Easy	Go
0997	Find the Town Judge	51.2%	Easy	Go
1002	Find Common Characters	73.8%	Easy	Go
1086	High Five	68.9%	Easy	Go
1119	Remove Vowels from a String	86.6%	Easy	Go
1122	Relative Sort Array	70.7%	Easy	Go
1128	Number of Equivalent Domino Pairs	54.5%	Easy	Go
1133	Largest Unique Number	64.5%	Easy	Go
1160	Find Words That Can Be Formed by Characters	68.8%	Easy	Go
1165	Single-Row Keyboard	83.8%	Easy	Go
1189	Maximum Number of Balloons	64.4%	Easy	Go
1275	Find Winner on a Tic Tac Toe Game	54.0%	Easy	Go
1331	Rank Transform of an Array	53.5%	Easy	Go
1346	Check If N and Its Double Exist	43.6%	Easy	Go
1370	Increasing Decreasing String	79.1%	Easy	Go
1394	Find Lucky Integer in an Array	66.4%	Easy	Go
1399	Count Largest Group	66.8%	Easy	Go
1426	Counting Elements	70.5%	Easy	Go
1436	Destination City	78.3%	Easy	Go
1460	Make Two Arrays Equal by Reversing Sub-arrays	74.4%	Easy	Go
1512	Number of Good Pairs	84.9%	Easy	Go
1536	Minimum Swaps to Arrange a Binary Grid	43.9%	Medium	Go
1570	Dot Product of Two Sparse Vectors	90.1%	Medium	Go
1603	Design Parking System	84.5%	Easy	Go
1624	Largest Substring Between Two Equal Characters	62.8%	Easy	Go
1640	Check Array Formation Through Concatenation	66.3%	Easy	Go
1656	Design an Ordered Stream	78.1%	Easy	Go
1711	Count Good Meals	35.9%	Medium	Go
1742	Maximum Number of Balls in a Box	70.7%	Easy	Go
1748	Sum of Unique Elements	75.0%	Easy	Go
1763	Longest Nice Substring	60.9%	Easy	Go
1796	Second Largest Digit in a String	48.7%	Easy	Go
1805	Number of Different Integers in a String	49.4%	Easy	Go
1935	Maximum Number of Words You Can Type	74.2%	Easy	Go
1941	Check if All Characters Have Equal Number of Occurrences	77.3%	Easy	Go
LCP 11	期望个数统计	68.4%	Easy	Go
0000	07	NaN%	Hard	Go
剑指 Offer 50	第一个只出现一次的字符 LCOF	61.4%	Easy	Go
剑指 Offer II 032	有效的变位词	59.9%	Easy	Go
剑指 Offer II 075	数组相对排序	71.8%	Easy	Go
0000	01	NaN%	Hard	Go
				Go
				Go
				Go
				Go

Greedy

#	Title	Acceptance	Difficulty	Solution	Algorithm
0045	Jump Game II	42.5%	Medium	Go
0055	Jump Game	43.2%	Medium	Go

Dp

#	Title	Acceptance	Difficulty	Solution	Algorithm
0005	Longest Palindromic Substring	35.3%	Medium	Go
0010	Regular Expression Matching	31.6%	Hard	Go
0032	Longest Valid Parentheses	35.6%	Hard	Go
0042	Trapping Rain Water	57.5%	Hard	Go
0044	Wildcard Matching	32.8%	Hard	Go
0053	Maximum Subarray	55.1%	Easy	Go
0062	Unique Paths	66.0%	Medium	Go
0063	Unique Paths II	39.0%	Medium	Go
0064	Minimum Path Sum	68.8%	Medium	Go
0070	Climbing Stairs	52.8%	Easy	Go
0072	Edit Distance	61.3%	Hard	Go
0087	Scramble String	48.9%	Hard	Go
0091	Decode Ways	30.5%	Medium	Go
0097	Interleaving String	45.8%	Medium	Go
0115	Distinct Subsequences	52.4%	Hard	Go
0118	Pascal's Triangle	72.6%	Easy	Go
0119	Pascal's Triangle II	66.3%	Easy	Go
0120	Triangle	67.9%	Medium	Go
0121	Best Time to Buy and Sell Stock	57.3%	Easy	Go
0123	Best Time to Buy and Sell Stock III	53.4%	Hard	Go
0139	Word Break	51.3%	Medium	Go
0279	Perfect Squares	63.1%	Medium	Go
0303	Range Sum Query - Immutable	72.4%	Easy	Go
0322	Coin Change	44.3%	Medium	Go
0474	Ones and Zeroes	61.0%	Medium	Go
0509	Fibonacci Number	67.7%	Easy	Go
0518	Coin Change 2	65.2%	Medium	Go
0523	Continuous Subarray Sum	27.4%	Medium	Go
0525	Contiguous Array	53.7%	Medium	Go
0877	Stone Game	75.7%	Medium	Go
1480	Running Sum of 1d Array	86.9%	Easy	Go
1744	Can You Eat Your Favorite Candy on Your Favorite Day?	36.3%	Medium	Go
1769	Minimum Number of Operations to Move All Balls to Each Box	85.5%	Medium	Go

Classic

#	Title	Acceptance	Difficulty	Solution	Algorithm
0005	Longest Palindromic Substring	35.3%	Medium	Go	manacher
0028	Implement strStr()	40.7%	Easy	Go	kmp
0169	Majority Element	66.5%	Easy	Go	Boyer-Moore 投票
0000	10	NaN%	Hard	Go	Boyer-Moore 投票

Math

#	Title	Acceptance	Difficulty	Solution	Algorithm
0007	Reverse Integer	35.4%	Easy	Go
0008	String to Integer (atoi)	21.7%	Medium	Go
0009	Palindrome Number	58.5%	Easy	Go
0012	Integer to Roman	66.5%	Medium	Go
0013	Roman to Integer	63.3%	Easy	Go
0029	Divide Two Integers	20.7%	Medium	Go
0031	Next Permutation	37.3%	Medium	Go
0043	Multiply Strings	44.9%	Medium	Go
0066	Plus One	45.8%	Easy	Go
0191	Number of 1 Bits	74.7%	Easy	Go
0268	Missing Number	62.3%	Easy	Go
0292	Nim Game	69.7%	Easy	Go
0319	Bulb Switcher	51.6%	Medium	Go
0415	Add Strings	53.6%	Easy	Go
0877	Stone Game	75.7%	Medium	Go
1025	Divisor Game	71.0%	Easy	Go
1266	Minimum Time Visiting All Points	82.4%	Easy	Go
1281	Subtract the Product and Sum of Digits of an Integer	83.2%	Easy	Go
1313	Decompress Run-Length Encoded List	83.1%	Easy	Go
1403	Minimum Subsequence in Non-Increasing Order	69.1%	Easy	Go
1791	Find Center of Star Graph	81.0%	Easy	Go

Sql

#	Title	Acceptance	Difficulty	Solution	Algorithm
0175	Combine Two Tables	74.0%	Easy	Go
0176	Second Highest Salary	35.6%	Easy	Go
0177	Nth Highest Salary	46.2%	Medium	Go
0178	Rank Scores	60.2%	Medium	Go
0180	Consecutive Numbers	48.7%	Medium	Go
0181	Employees Earning More Than Their Managers	70.3%	Easy	Go
0182	Duplicate Emails	79.7%	Easy	Go
0183	Customers Who Never Order	67.8%	Easy	Go
0184	Department Highest Salary	47.5%	Medium	Go
0185	Department Top Three Salaries	49.3%	Hard	Go
0196	Delete Duplicate Emails	66.5%	Easy	Go
0197	Rising Temperature	53.4%	Easy	Go
0262	Trips and Users	43.8%	Hard	Go
0511	Game Play Analysis I	73.4%	Easy	Go
0512	Game Play Analysis II	53.8%	Easy	Go
0534	Game Play Analysis III	67.6%	Medium	Go
0550	Game Play Analysis IV	43.8%	Medium	Go
0569	Median Employee Salary	56.2%	Hard	Go
0570	Managers with at Least 5 Direct Reports	66.4%	Medium	Go
0571	Find Median Given Frequency of Numbers	48.9%	Hard	Go
0574	Winning Candidate	64.8%	Medium	Go
0577	Employee Bonus	70.6%	Easy	Go
0578	Get Highest Answer Rate Question	49.8%	Medium	Go
0579	Find Cumulative Salary of an Employee	41.3%	Hard	Go
0580	Count Student Number in Departments	52.5%	Medium	Go
0584	Find Customer Referee	77.3%	Easy	Go
0585	Investments in 2016	59.5%	Medium	Go
0586	Customer Placing the Largest Number of Orders	75.0%	Easy	Go
0595	Big Countries	79.6%	Easy	Go
0596	Classes More Than 5 Students	42.0%	Easy	Go
0597	Friend Requests I: Overall Acceptance Rate	44.1%	Easy	Go
0601	Human Traffic of Stadium	49.7%	Hard	Go
0602	Friend Requests II: Who Has the Most Friends	62.9%	Medium	Go
0603	Consecutive Available Seats	67.4%	Easy	Go
0607	Sales Person	66.5%	Easy	Go
0608	Tree Node	65.9%	Medium	Go
0610	Triangle Judgement	66.7%	Easy	Go
0612	Shortest Distance in a Plane	66.9%	Medium	Go
0613	Shortest Distance in a Line	81.7%	Easy	Go
0614	Second Degree Follower	34.6%	Medium	Go
0615	Average Salary: Departments VS Company	42.4%	Hard	Go
0618	Students Report By Geography	62.1%	Hard	Go
0619	Biggest Single Number	46.6%	Easy	Go
0620	Not Boring Movies	77.3%	Easy	Go
0626	Exchange Seats	68.3%	Medium	Go
0627	Swap Salary	80.7%	Easy	Go
1045	Customers Who Bought All Products	64.5%	Medium	Go
1050	Actors and Directors Who Cooperated At Least Three Times	75.7%	Easy	Go
1068	Product Sales Analysis I	86.4%	Easy	Go
1069	Product Sales Analysis II	82.0%	Easy	Go
1070	Product Sales Analysis III	48.4%	Medium	Go
1075	Project Employees I	69.5%	Easy	Go
1076	Project Employees II	49.7%	Easy	Go
1077	Project Employees III	72.2%	Medium	Go
1082	Sales Analysis I	76.0%	Easy	Go
1083	Sales Analysis II	52.8%	Easy	Go
1084	Sales Analysis III	53.8%	Easy	Go
1097	Game Play Analysis V	51.9%	Hard	Go
1098	Unpopular Books	47.4%	Medium	Go
1107	New Users Daily Count	41.0%	Medium	Go
1112	Highest Grade For Each Student	64.3%	Medium	Go
1113	Reported Posts	54.2%	Easy	Go
1126	Active Businesses	69.4%	Medium	Go
1127	User Purchase Platform	41.7%	Hard	Go
1132	Reported Posts II	38.9%	Medium	Go
1141	User Activity for the Past 30 Days I	51.1%	Easy	Go
1142	User Activity for the Past 30 Days II	37.1%	Easy	Go
1148	Article Views I	71.8%	Easy	Go
1149	Article Views II	44.3%	Medium	Go
1158	Market Analysis I	55.1%	Medium	Go
1159	Market Analysis II	48.9%	Hard	Go
1164	Product Price at a Given Date	61.6%	Medium	Go
1173	Immediate Food Delivery I	75.7%	Easy	Go
1174	Immediate Food Delivery II	62.0%	Medium	Go
1179	Reformat Department Table	63.4%	Easy	Go
1193	Monthly Transactions I	61.0%	Medium	Go
1194	Tournament Winners	51.5%	Hard	Go
1204	Last Person to Fit in the Bus	72.9%	Medium	Go
1205	Monthly Transactions II	46.8%	Medium	Go
1211	Queries Quality and Percentage	65.8%	Easy	Go
1212	Team Scores in Football Tournament	51.5%	Medium	Go
1225	Report Contiguous Dates	54.5%	Hard	Go
1241	Number of Comments per Post	59.7%	Easy	Go
1251	Average Selling Price	77.2%	Easy	Go
1264	Page Recommendations	57.3%	Medium	Go
1270	All People Report to the Given Manager	80.5%	Medium	Go
1280	Students and Examinations	50.6%	Easy	Go
1285	Find the Start and End Number of Continuous Ranges	81.3%	Medium	Go
1294	Weather Type in Each Country	66.0%	Easy	Go
1303	Find the Team Size	82.1%	Easy	Go
1308	Running Total for Different Genders	75.1%	Medium	Go
1321	Restaurant Growth	61.7%	Medium	Go
1322	Ads Performance	59.2%	Easy	Go
1327	List the Products Ordered in a Period	69.2%	Easy	Go
1336	Number of Transactions per Visit	42.3%	Hard	Go
1341	Movie Rating	48.0%	Medium	Go
1350	Students With Invalid Departments	84.8%	Easy	Go
1355	Activity Participants	66.2%	Medium	Go
1364	Number of Trusted Contacts of a Customer	67.5%	Medium	Go
1369	Get the Second Most Recent Activity	60.7%	Hard	Go
1378	Replace Employee ID With The Unique Identifier	86.1%	Easy	Go
1384	Total Sales Amount by Year	54.2%	Hard	Go
1393	Capital Gain/Loss	85.7%	Medium	Go
1398	Customers Who Bought Products A and B but Not C	77.1%	Medium	Go
1407	Top Travellers	66.7%	Easy	Go
1412	Find the Quiet Students in All Exams	55.1%	Hard	Go
1418	Display Table of Food Orders in a Restaurant	73.3%	Medium	Go
1421	NPV Queries	74.8%	Medium	Go
1435	Create a Session Bar Chart	62.1%	Easy	Go
1440	Evaluate Boolean Expression	69.6%	Medium	Go
1445	Apples & Oranges	85.8%	Medium	Go
1454	Active Users	40.3%	Medium	Go
1459	Rectangles Area	59.4%	Medium	Go
1468	Calculate Salaries	71.2%	Medium	Go
1479	Sales by Day of the Week	57.4%	Hard	Go
1485	Group Sold Products By The Date	66.0%	Easy	Go
1495	Friendly Movies Streamed Last Month	54.3%	Easy	Go
1501	Countries You Can Safely Invest In	59.1%	Medium	Go
1511	Customer Order Frequency	68.1%	Easy	Go
1517	Find Users With Valid E-Mails	72.9%	Easy	Go
1527	Patients With a Condition	50.8%	Easy	Go
1532	The Most Recent Three Orders	62.0%	Medium	Go
1543	Fix Product Name Format	54.8%	Easy	Go
1549	The Most Recent Orders for Each Product	66.7%	Medium	Go
1555	Bank Account Summary	43.5%	Medium	Go
1565	Unique Orders and Customers Per Month	72.6%	Easy	Go
1571	Warehouse Manager	75.7%	Easy	Go
1581	Customer Who Visited but Did Not Make Any Transactions	81.1%	Easy	Go
1587	Bank Account Summary II	82.5%	Easy	Go
1596	The Most Frequently Ordered Products for Each Customer	76.2%	Medium	Go
1607	Sellers With No Sales	54.8%	Easy	Go
1613	Find the Missing IDs	72.4%	Medium	Go
1623	All Valid Triplets That Can Represent a Country	78.3%	Easy	Go
1633	Percentage of Users Attended a Contest	65.7%	Easy	Go
1635	Hopper Company Queries I	54.4%	Hard	Go
1645	Hopper Company Queries II	41.2%	Hard	Go
1651	Hopper Company Queries III	68.6%	Hard	Go
1661	Average Time of Process per Machine	73.1%	Easy	Go
1667	Fix Names in a Table	60.3%	Easy	Go
1677	Product's Worth Over Invoices	40.0%	Easy	Go
1683	Invalid Tweets	89.5%	Easy	Go
1693	Daily Leads and Partners	80.2%	Easy	Go
1699	Number of Calls Between Two Persons	79.9%	Medium	Go
1709	Biggest Window Between Visits	71.5%	Medium	Go
1715	Count Apples and Oranges	73.8%	Medium	Go
1729	Find Followers Count	62.5%	Easy	Go
1731	The Number of Employees Which Report to Each Employee	47.8%	Easy	Go
1741	Find Total Time Spent by Each Employee	84.5%	Easy	Go
1747	Leetflex Banned Accounts	70.4%	Medium	Go
1757	Recyclable and Low Fat Products	92.4%	Easy	Go
1767	Find the Subtasks That Did Not Execute	79.6%	Hard	Go
1777	Product's Price for Each Store	77.9%	Easy	Go
1783	Grand Slam Titles	78.9%	Medium	Go
1789	Primary Department for Each Employee	71.4%	Easy	Go
1795	Rearrange Products Table	79.1%	Easy	Go
1809	Ad-Free Sessions	64.0%	Easy	Go
1811	Find Interview Candidates	66.5%	Medium	Go
1821	Find Customers With Positive Revenue this Year	90.0%	Easy	Go
1831	Maximum Transaction Each Day	73.3%	Medium	Go