GitHub - pastriver/Play-Leetcode: My Solutions to Leetcode problems. All solutions support C++ language, some support Java and Python. Multiple solutions will be given by most problems. Enjoy:) 我的Leetcode解答。所有的问题都支持C++语言，一部分问题支持Java语言。近乎所有问题都会提供多个算法解决。大家加油！：）

This is my solutions for Leetcode

I will put my solutions of Leetcode Problems in this repo. Every problem will be solved in C++; part of the problems will be solved in Java also. I will try my best to support more language in the future :)

Please feel free to contact me if you have any problems with this repo:)

email: [email protected]

如果有任何问题，欢迎联系我：）

个人网站：liuyubobobo.com

电子邮件：[email protected]

微博: 刘宇波bobo http://weibo.com/liuyubobobo

知乎: 刘宇波 http://www.zhihu.com/people/liuyubobobo

知乎专栏：是不是很酷 https://zhuanlan.zhihu.com/liuyubobobo

个人公众号：是不是很酷：）

Problems

ID	Problem	Official Solution	C++	Java
001	Two Sum	solution	C++	Java

003	Longest-Substring-Without-Repeating-Characters	solution	C++	Java

007	Reverse Integer	solution	C++

014	Longest Common Prefix	[无]	C++
015	3Sum	[无]	C++

017	Letter Combinations of a Phone Number	[无]	C++	Java

019	Remove Nth Node From End of List	solution	C++	Java
020	Valid Parentheses	[无]	C++	Java
021	Merge Two Sorted Lists	solution	C++

023	Merge k Sorted Lists	solution	C++
024	Swap Nodes in Pairs	[无]	C++	Java

027	Remove Element	solution	C++
028	Implement strStr()	[无] [缺：KMP等高级字符串匹配算法]	C++

033	Search in Rotated Sorted Array	[无]	C++
034	Search for a Range	solution	C++

039	Combination Sum	[无]	C++
040	Combination Sum II	[无]	C++

046	Permutations	[缺：排列算法整理]	C++	Java
047	Permutations II	[无]	C++

051	N-Queens	[缺：N皇后问题整理]	C++	Java

054	Spiral Matrix	solution	C++

056	Merge Intervals	solution	C++

059	Spiral Matrix II	[无]	C++

061	Rotate List	[无]	C++

064	Minimum Path Sum	solution	C++	Java

066	Plus One	[无]	C++
067	Add Binary	[无]	C++

069	Sqrt(x)	[无]	C++
070	Climbing Stairs	solution	C++	Java

075	Sort Colors	[无]	C++	Java
076	Minimum Window Substring	[无]	C++
077	Combinations	[缺：组合算法整理]	C++	Java

079	Word Search	[无]	C++	Java

086	Partition List	[无]	C++
087	Scramble String	[无]	C++
088	Merge Sorted Array	[无]	C++

094	Binary Tree Inorder Traversal	solution	C++	Java

098	Validate Binary Search Tree	[无]	C++	Java
099	Recover Binary Search Tree	[无]		Java

101	Symmetric Tree	solution	C++
102	Binary Tree Level Order Traversal	[无]	C++	Java

104	Maximum Depth of Binary Tree	[无]	C++	Java
105	Construct Binary Tree from Preorder and Inorder Traversal	[无]	C++
106	Construct Binary Tree from Inorder and Postorder Traversal	[无]	C++

109	Convert Sorted List to Binary Search Tree	[无]	C++

111	Minimum Depth of Binary Tree	[无]	C++
112	Path Sum	[无]	C++	Java

115	Distinct Subsequences	[无]	C++	Java

118	Pascal's Triangle	solution	C++

120	Triangle	[无]	C++
121	Best Time to Buy and Sell Stock		C++
122	Best Time to Buy and Sell Stock II		C++
123	Best Time to Buy and Sell Stock III		C++

125	Valid Palindrome	[无]	C++
126	Word Ladder II	[无] [缺：双端搜索]	C++
127	Word Ladder	[无]	C++	Java
128	Longest Consecutive Sequence		C++

136	Single Number	solution	C++

141	Linked List Cycle	solution	C++
142	Linked List Cycle II	solution	C++

144	Binary Tree Preorder Traversal	[无]	C++	Java
145	Binary Tree Postorder Traversal	[无]	C++	Java

149	Max Points on a Line	[无]	C++

249	Max Points on a Line	[无]	C++

155	Min Stack	[无]	C++

167	Two Sum II - Input array is sorted	solution	C++	Java

169	Majority Element	solution	C++

173	Binary Search Tree Iterator	[无] [缺：Morris遍历]	C++

188	Best-Time-to-Buy-and-Sell-Stock-IV		C++

198	House Robber	solution	C++	Java

200	Number of Islands	[无]	C++	Java

202	Happy Number	[无]	C++
203	Remove Linked List Elements	[无]	C++	Java

205	Isomorphic Strings	[无]	C++
206	Reverse Linked List	solution	C++	Java

208	Implement Trie (Prefix Tree)	solution	C++
209	Minimum Size Subarray Sum	solution	C++	Java

211	Add and Search Word - Data structure design	[无]	C++

213	House Robber II	[无]	C++

215	Kth Largest Element in an Array	[无]	C++
216	Combination Sum III	[无]	C++
217	Contains Duplicate	[无]	C++
218	The Skyline Problem		C++
219	Contains Duplicate II	solution	C++	Java
220	Contains Duplicate III	solution	C++	Java

226	Invert Binary Tree	solution	C++	Java

232	Implement Queue using Stacks	solution	C++

234	Palindrome Linked List	[无]	C++
235	Lowest Common Ancestor of a Binary Search Tree	[无]	C++	Java

237	Delete Node in a Linked List	solution	C++	Java

239	Sliding Window Maximum	[无]	C++

250	Count Univalue Subtrees	[无]	C++

254	Factor Combinations	[无]	C++

257	Binary Tree Paths	[缺：非递归算法]	C++	Java

268	Missing Number	solution	C++

279	Perfect Squares	[无]	C++	Java

283	Move Zeroes	solution	C++	Java

287	Find the Duplicate Number		C++

290	Word Pattern	[无]	C++

300	Longest Increasing Subsequence	solution	C++	Java

303	Range Sum Query - Immutable		C++

307	Range Sum Query - Mutable	[缺：BIT]	C++
308	Range Sum Query 2D - Mutable		C++
309	Best Time to Buy and Sell Stock with Cooldown		C++

319	Bulb Switcher	[无]	C++

322	Coin Change	solution	C++

337	House Robber III	[无]	C++

343	Integer Break	[无]	C++	Java
344	Reverse String	[无]	C++

347	Top K Frequent Elements	[无]	C++	Java

349	Intersection of Two Arrays	[无]	C++	Java
350	Intersection of Two Arrays II	[无]	C++	Java

370	Range Addition		C++

374	Guess Number Higher or Lower	solution	C++

377	Combination Sum IV	[无]	C++

380	Insert Delete GetRandom O(1)	[无]	C++
381	Insert Delete GetRandom O(1) - Duplicates allowed	[无]	C++
382	Linked List Random Node	[无]	C++

384	Shuffle an Array	solution	C++

386	Lexicographical Numbers		C++
387	First Unique Character in a String		C++	Java
388	Longest Absolute File Path		C++
389	Find the Difference		C++
390	Elimination Game		C++
391	Perfect Rectangle	[缺：矩形求交]	C++

398	Random Pick Index	[无]	C++

416	Partition Equal Subset Sum	[无]	C++	Java
417	Pacific Atlantic Water Flow	[无]		Java

434	Number of Segments in a String		C++
435	Non-overlapping Intervals	solution	C++	Java

437	Path Sum III	[无]	C++	Java
438	Find All Anagrams in a String	[无]	C++

443	String Compression		C++

447	Number of Boomerangs	[无]	C++	Java

454	4Sum II	[无]	C++	Java
455	Assign Cookies	[无]	C++	Java

470	Implement Rand10() Using Rand7()	solution [缺：Rejection Sampling]	C++

485	Max Consecutive Ones	[无]	C++

490	The Maze	solution	C++

498	Diagonal Traverse	[无]	C++

518	Coin Change 2	[无]	C++

530	Minimum Absolute Difference in BST	[无]		Java

541	Reverse String II	solution	C++

561	Array Partition I	solution	C++

583	Delete Operation for Two Strings	solution	C++

598	Range Addition II		C++
599	Minimum Index Sum of Two Lists	solution	C++
600	Non-negative Integers without Consecutive Ones	solution [缺：Bit Manipulation]	C++

637	Average of Levels in Binary Tree	solution	C++

648	Replace Words	[无]	C++

672	Bulb Switcher II	solution	C++
673	Number of Longest Increasing Subsequence	[缺：BIT；线段树]	C++
674	Longest Continuous Increasing Subsequence		C++
675	Cut Off Trees for Golf Event	[缺：A*；Hadlock's Algo]	C++
676	Implement Magic Dictionary	solution	C++
677	Map Sum Pairs	solution	C++

684	Redundant Connection	solution	C++
685	Redundant Connection II	solution	C++

690	Employee Importance	solution	C++

692	Top K Frequent Words	solution	C++

694	Number of Distinct Islands	[review: hash的方式]	C++
695	Max-Area-of-Island		C++
696	Count Binary Substrings		C++
697	Degree of an Array		C++
698	Partition to K Equal Sum Subsets		C++	Java
699	Falling Squares	[缺：线段树；块状链表]	C++

710	Random Pick with Blacklist	solution	C++
711	Number of Distinct Islands II	[review: hash的方式]	C++
712	Minimum ASCII Delete Sum for Two Strings		C++
713	Subarray Product Less Than K		C++
714	Best Time to Buy and Sell Stock with Transaction Fee		C++
715	Range Module	[缺：set查找]	C++
716	Max Stack	solution	C++
717	1-bit and 2-bit Characters		C++
718	Maximum Length of Repeated Subarray	[缺：Rolling Hash]	C++
719	Find K-th Smallest Pair Distance	[缺：二分搜索]	C++
720	Longest Word in Dictionary	solution	C++
721	Accounts Merge	solution	C++
722	Remove Comments	solution	C++
723	Candy Crush	solution	C++
724	Find Pivot Index	solution	C++
725	Split Linked List in Parts	solution	C++

727	Minimum Window Subsequence	solution	C++
728	Self Dividing Numbers	solution	C++
729	My Calendar I	solution	C++

731	My Calendar II	solution	C++
732	My Calendar III	solution	C++
733	Flood Fill	solution	C++
734	Sentence Similarity	solution	C++
735	Asteroid Collision	solution	C++
736	Parse Lisp Expression	solution	C++
737	Sentence Similarity II	solution	C++

740	Delete and Earn	solution	C++
741	Cherry Pickup	solution [缺：自底向上的动态规划]	C++

747	Largest Number At Least Twice of Others	solution	C++

765	Couples Holding Hands	solution	C++
766	Toeplitz Matrix	solution	C++
780	Reaching Points	solution	C++
781	Rabbits in Forest	solution	C++

783	Minimum Distance Between BST Nodes	solution	C++
784	Letter Case Permutation	solution	C++
785	Is Graph Bipartite?	solution	C++
786	K-th Smallest Prime Fraction	solution [缺：分治算法]	C++
787	Cheapest Flights Within K Stops	solution [缺：使用Heap]	C++
788	Rotated Digits	solution	C++
789	Escape The Ghosts	solution	C++
790	Domino and Tromino Tiling	solution [缺：转移矩阵求幂解法]	C++
791	Custom Sort String	solution	C++
792	Number of Matching Subsequences	solution	C++
793	Preimage Size of Factorial Zeroes Function	solution	C++
794	Valid Tic-Tac-Toe State	solution	C++
795	Number of Subarrays with Bounded Maximum	solution	C++
796	Rotate String	solution [缺：Rolling Hash]	C++
797	All Paths From Source to Target	solution	C++

799	Champagne Tower	solution	C++
800	Similar RGB Color	solution	C++

804	Unique Morse Code Words	solution	C++
805	Split Array With Same Average	solution	C++
806	Number of Lines To Write String	solution	C++
807	Max Increase to Keep City Skyline	solution	C++

809	Expressive Words	solution	C++

811	Subdomain Visit Count	solution	C++

817	Linked List Components	solution	C++

819	Most Common Word	solution	C++

852	Peak Index in a Mountain Array	solution	C++
853	Car Fleet	solution	C++
854	K-Similar Strings	solution	C++
855	Exam Room	solution	C++
856	Score of Parentheses	solution	C++
857	Minimum Cost to Hire K Workers	solution [缺：二分搜索]	C++
858	Mirror Reflection	solution	C++
859	Buddy Strings	solution	C++
860	Lemonade Change	solution	C++
861	Score After Flipping Matrix	solution	C++

863	All Nodes Distance K in Binary Tree	solution	C++
864	Shortest Path to Get All Keys	solution [缺：Dijkstra]	C++
865	Smallest Subtree with all the Deepest Nodes	solution	C++
866	Prime Palindrome	solution	C++
867	Transpose Matrix	solution	C++
868	Binary Gap	solution	C++
869	Reordered Power of 2	solution	C++
870	Advantage Shuffle	solution	C++

872	Leaf-Similar Trees	solution	C++
873	Length of Longest Fibonacci Subsequence	solution	C++
874	Walking-Robot-Simulation	solution	C++
875	Koko Eating Bananas	solution	C++

Name		Name	Last commit message	Last commit date
Latest commit History 393 Commits
0001-Two-Sum		0001-Two-Sum
0003-Longest-Substring-Without-Repeating-Characters		0003-Longest-Substring-Without-Repeating-Characters
0007-Reverse-Integer/cpp-0007		0007-Reverse-Integer/cpp-0007
0014-Longest-Common-Prefix/cpp-0014		0014-Longest-Common-Prefix/cpp-0014
0015-3Sum/cpp-3Sum		0015-3Sum/cpp-3Sum
0017-Letter-Combinations-of-a-Phone-Number		0017-Letter-Combinations-of-a-Phone-Number
0019-Remove-Nth-Node-From-End-of-List		0019-Remove-Nth-Node-From-End-of-List
0020-Valid-Parentheses		0020-Valid-Parentheses
0021-Merge-Two-Sorted-Lists/cpp-0021		0021-Merge-Two-Sorted-Lists/cpp-0021
0023-Merge-k-Sorted-Lists/cpp-0023		0023-Merge-k-Sorted-Lists/cpp-0023
0024-Swap-Nodes-in-Pairs		0024-Swap-Nodes-in-Pairs
0027-Remove-Element/cpp-0027		0027-Remove-Element/cpp-0027
0028-Implement-strStr/cpp-0028		0028-Implement-strStr/cpp-0028
0033-Search-in-Rotated-Sorted-Array/cpp-0033		0033-Search-in-Rotated-Sorted-Array/cpp-0033
0034-Search-for-a-Range/cpp-0034		0034-Search-for-a-Range/cpp-0034
0039-Combination-Sum/cpp-0039		0039-Combination-Sum/cpp-0039
0040-Combination-Sum-II/cpp-0040		0040-Combination-Sum-II/cpp-0040
0046-Permutations		0046-Permutations
0047-Permutations-II/cpp-0047		0047-Permutations-II/cpp-0047
0051-N-Queens		0051-N-Queens
0054-Spiral-Matrix/cpp-0054		0054-Spiral-Matrix/cpp-0054
0056-Merge-Intervals/cpp-0056		0056-Merge-Intervals/cpp-0056
0059-Spiral-Matrix-II/cpp-0059		0059-Spiral-Matrix-II/cpp-0059
0061-Rotate-List/cpp-0061		0061-Rotate-List/cpp-0061
0064-Minimum-Path-Sum/cpp-0064		0064-Minimum-Path-Sum/cpp-0064
0066-Plus-One/cpp-0066		0066-Plus-One/cpp-0066
0067-Add-Binary/cpp-0067		0067-Add-Binary/cpp-0067
0069-Sqrt-x/cpp-0069		0069-Sqrt-x/cpp-0069
0070-Climbing-Stairs		0070-Climbing-Stairs
0075-Sort-Colors		0075-Sort-Colors
0076-Minimum-Window-Substring/cpp-0076		0076-Minimum-Window-Substring/cpp-0076
0077-Combinations		0077-Combinations
0079-Word-Search		0079-Word-Search
0086-Partition-List/cpp-0086		0086-Partition-List/cpp-0086
0087-Scramble-String/cpp-0087		0087-Scramble-String/cpp-0087
0088-Merge-Sorted-Array/cpp-0088		0088-Merge-Sorted-Array/cpp-0088
0094-Binary-Tree-Inorder-Traversal		0094-Binary-Tree-Inorder-Traversal
0098-Validate-Binary-Search-Tree		0098-Validate-Binary-Search-Tree
0099-Recover-Binary-Search-Tree/java-0099/src		0099-Recover-Binary-Search-Tree/java-0099/src
0101-Symmetric-Tree/cpp-0101		0101-Symmetric-Tree/cpp-0101
0102-Binary-Tree-Level-Order-Traversal		0102-Binary-Tree-Level-Order-Traversal
0104-Maximum-Depth-of-Binary-Tree		0104-Maximum-Depth-of-Binary-Tree
0105-Construct-Binary-Tree-from-Preorder-and-Inorder Traversal/cpp-0105		0105-Construct-Binary-Tree-from-Preorder-and-Inorder Traversal/cpp-0105
0106-Construct-Binary-Tree-from-Inorder-and-Postorder Traversal/cpp-0106		0106-Construct-Binary-Tree-from-Inorder-and-Postorder Traversal/cpp-0106
0109-Convert-Sorted-List-to-Binary-Search-Tree/cpp-0109		0109-Convert-Sorted-List-to-Binary-Search-Tree/cpp-0109
0111-Minimum-Depth-of-Binary-Tree/cpp-0111		0111-Minimum-Depth-of-Binary-Tree/cpp-0111
0112-Path-Sum		0112-Path-Sum
0115-Distinct-Subsequences		0115-Distinct-Subsequences
0118-Pascals-Triangle/cpp-0118		0118-Pascals-Triangle/cpp-0118
0120-Triangle/cpp-0120		0120-Triangle/cpp-0120
0121-Best-Time-to-Buy-and-Sell-Stock/cpp-0121		0121-Best-Time-to-Buy-and-Sell-Stock/cpp-0121
0122-Best-Time-to-Buy-and-Sell-Stock-II/cpp-0122		0122-Best-Time-to-Buy-and-Sell-Stock-II/cpp-0122
0123-Best-Time-to-Buy-and-Sell-Stock-III/cpp-0123		0123-Best-Time-to-Buy-and-Sell-Stock-III/cpp-0123
0125-Valid-Palindrome/cpp-0125		0125-Valid-Palindrome/cpp-0125
0126-Word-Ladder-II/cpp-0126		0126-Word-Ladder-II/cpp-0126
0127-Word-Ladder		0127-Word-Ladder
0128-Longest-Consecutive-Sequence/cpp-0128		0128-Longest-Consecutive-Sequence/cpp-0128
0136-Single-Number/cpp-0136		0136-Single-Number/cpp-0136
0141-Linked-List-Cycle/cpp-0141		0141-Linked-List-Cycle/cpp-0141
0142-Linked-List-Cycle-II/cpp-0142		0142-Linked-List-Cycle-II/cpp-0142
0144-Binary-Tree-Preorder-Traversal		0144-Binary-Tree-Preorder-Traversal
0145-Binary-Tree-Postorder-Traversal		0145-Binary-Tree-Postorder-Traversal
0149-Max-Points-on-a-Line/cpp-0149		0149-Max-Points-on-a-Line/cpp-0149
0155-Min-Stack/cpp-0155		0155-Min-Stack/cpp-0155
0167-Two-Sum-II-Input-array-is-sorted		0167-Two-Sum-II-Input-array-is-sorted
0169-Majority-Element/cpp-0169		0169-Majority-Element/cpp-0169
0173-Binary-Search-Tree-Iterator/cpp-0173		0173-Binary-Search-Tree-Iterator/cpp-0173
0188-Best-Time-to-Buy-and-Sell-Stock-IV/cpp-0188		0188-Best-Time-to-Buy-and-Sell-Stock-IV/cpp-0188
0198-House-Robber		0198-House-Robber
0200-Number-of-Islands		0200-Number-of-Islands
0202-Happy-Number/cpp-0202		0202-Happy-Number/cpp-0202
0203-Remove-Linked-List-Elements		0203-Remove-Linked-List-Elements
0205-Isomorphic-Strings/cpp-0205		0205-Isomorphic-Strings/cpp-0205
0206-Reverse-Linked-List		0206-Reverse-Linked-List
0208-Implement-Trie-Prefix-Tree/cpp-0208		0208-Implement-Trie-Prefix-Tree/cpp-0208
0209-Minimum-Size-Subarray-Sum		0209-Minimum-Size-Subarray-Sum
0211-Add-and-Search-Word-Data-structure-design/cpp-0211		0211-Add-and-Search-Word-Data-structure-design/cpp-0211
0213-House-Robber-II/cpp-0213		0213-House-Robber-II/cpp-0213
0215-Kth-Largest-Element-in-an-Array/cpp-0215		0215-Kth-Largest-Element-in-an-Array/cpp-0215
0216-Combination-Sum-III/cpp-0216		0216-Combination-Sum-III/cpp-0216
0217 Contains Duplicate/cpp-0217		0217 Contains Duplicate/cpp-0217
0218-The-Skyline-Problem/cpp-0218		0218-The-Skyline-Problem/cpp-0218
0219-Contains-Duplicate-II		0219-Contains-Duplicate-II
0220-Contains-Duplicate-III		0220-Contains-Duplicate-III
0226-Invert-Binary-Tree		0226-Invert-Binary-Tree
0232-Implement-Queue-using-Stacks/cpp-0232		0232-Implement-Queue-using-Stacks/cpp-0232
0234-Palindrome-Linked-List/cpp-0234		0234-Palindrome-Linked-List/cpp-0234
0235-Lowest-Common-Ancestor-of-a-Binary-Search-Tree		0235-Lowest-Common-Ancestor-of-a-Binary-Search-Tree
0237-Delete-Node-in-a-Linked-List		0237-Delete-Node-in-a-Linked-List
0239-Sliding-Window-Maximum/cpp-0239		0239-Sliding-Window-Maximum/cpp-0239
0250-Count-Univalue-Subtrees/cpp-0250		0250-Count-Univalue-Subtrees/cpp-0250
0254-Factor-Combinations/cpp-0254		0254-Factor-Combinations/cpp-0254
0257-Binary-Tree-Paths		0257-Binary-Tree-Paths
0268-Missing-Number/cpp-0268		0268-Missing-Number/cpp-0268
0279-Perfect-Squares		0279-Perfect-Squares
0283-Move-Zeroes		0283-Move-Zeroes
0287-Find-the-Duplicate-Number/cpp-0287		0287-Find-the-Duplicate-Number/cpp-0287
0290-Word-Pattern/cpp-0290		0290-Word-Pattern/cpp-0290
0300-Longest-Increasing-Subsequence		0300-Longest-Increasing-Subsequence
0303-Range-Sum-Query-Immutable/cpp-0303		0303-Range-Sum-Query-Immutable/cpp-0303

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