Leetcode

Leetcode algorithm solutions.

All the codes are runnable, you can directly run these codes to view the results or debug.

#(102)	Title	Solution	Difficulty
1	Two Sum	Solution	Easy
2	Add Two Numbers	Solution	Medium
3	Longest Substring Without Repeating Characters	Solution	Medium
4	Median of Two Sorted Arrays	Solution	Hard
5	Longest Palindromic Substring	Solution	Medium
6	Zigzag Conversion	Solution	Medium
7	Reverse Integer	Solution	Medium
9	Palindrome Number	Solution	Easy
11	Container With Most Water	Solution	Medium
12	Integer to Roman	Solution	Medium
13	Roman to Integer	Solution	Easy
14	Longest Common Prefix	Solution	Easy
15	3Sum	Solution	Medium
16	3Sum Closest	Solution	Medium
17	Letter Combinations of a Phone Number	Solution	Medium
19	Remove Nth Node From End of List	Solution	Medium
22	Generate Parentheses	Solution	Medium
25	Reverse Nodes in k-Group	Solution	Hard
27	Remove Element	Solution	Easy
42	Trapping Rain Water	Solution	Hard
45	Jump Game II	Solution	Medium
46	Permutations	Solution	Medium
48	Rotate Image	Solution	Medium
51	N-Queens	Solution	Hard
53	Maximum Subarray	Solution	Medium
55	Jump Game	Solution	Medium
58	Length of Last Word	Solution	Easy
61	Rotate List	Solution	Medium
62	Unique Paths	Solution	Medium
63	Unique Paths II	Solution	Medium
64	Minimum Path Sum	Solution	Medium
72	Edit Distance	Solution	Medium
80	Remove Duplicates from Sorted Array II	Solution	Medium
83	Remove Duplicates from Sorted List	Solution	Easy
86	Partition List	Solution	Medium
95	Unique Binary Search Trees II	Solution	Medium
98	Validate Binary Search Tree	Solution	Medium
101	Symmetric Tree	Solution	Easy
103	Binary Tree Zigzag Level Order Traversal	Solution	Medium
104	Maximum Depth of Binary Tree	Solution	Easy
106	Construct Binary Tree from Inorder and Postorder Traversal	Solution	Medium
107	Binary Tree Level Order Traversal II	Solution	Medium
112	Path Sum	Solution	Easy
114	Flatten Binary Tree to Linked List	Solution	Medium
116	Populating Next Right Pointers in Each Node	Solution	Medium
118	Pascal's Triangle	Solution	Easy
120	Triangle	Solution	Medium
121	Best Time to Buy and Sell Stock	Solution	Easy
125	Valid Palindrome	Solution	Easy
139	Word Break	Solution	Medium
144	Binary Tree Preorder Traversal	Solution	Easy
146	LRU Cache	Solution	Medium
151	Reverse Words in a String	Solution	Medium
165	Compare Version Numbers	Solution	Medium
167	Two Sum II - Input Array Is Sorted	Solution	Medium
189	Rotate Array	Solution	Medium
198	House Robber	Solution	Medium
199	Binary Tree Right Side View	Solution	Medium
202	Happy Number	Solution	Easy
205	Isomorphic Strings	Solution	Easy
206	Reverse Linked List	Solution	Easy
221	Maximal Square	Solution	Medium
222	Count Complete Tree Nodes	Solution	Medium
226	Invert Binary Tree	Solution	Easy
230	Kth Smallest Element in a BST	Solution	Medium
236	Lowest Common Ancestor of a Binary Tree	Solution	Medium
238	Product of Array Except Self	Solution	Medium
290	Word Pattern	Solution	Easy
300	Longest Increasing Subsequence	Solution	Medium
303	Range Sum Query - Immutable	Solution	Easy
322	Coin Change	Solution	Medium
334	Increasing Triplet Subsequence	Solution	Medium
345	Reverse Vowels of a String	Solution	Easy
374	Guess Number Higher or Lower	Solution	Easy
392	Is Subsequence	Solution	Easy
437	Path Sum III	Solution	Medium
443	String Compression	Solution	Medium
523	Continuous Subarray Sum	Solution	Medium
530	Minimum Absolute Difference in BST	Solution	Easy
563	Binary Tree Tilt	Solution	Easy
623	Add One Row to Tree	Solution	Medium
637	Average of Levels in Binary Tree	Solution	Easy
643	Maximum Average Subarray I	Solution	Easy
653	Two Sum IV - Input is a BST	Solution	Easy
654	Maximum Binary Tree	Solution	Medium
655	Print Binary Tree	Solution	Medium
680	Valid Palindrome II	Solution	Easy
747	Min Cost Climbing Stairs	Solution	Easy
904	Leaf-Similar Trees	Solution	Easy
967	Minimum Falling Path Sum	Solution	Medium
1046	Max Consecutive Ones III	Solution	Medium
1146	Greatest Common Divisor of Strings	Solution	Easy
1236	N-th Tribonacci Number	Solution	Easy
1392	Find the Difference of Two Arrays	Solution	Easy
1474	Longest ZigZag Path in a Binary Tree	Solution	Medium
1544	Count Good Nodes in Binary Tree	Solution	Medium
1567	Maximum Number of Vowels in a Substring of Given Length	Solution	Medium
1693	Sum of All Odd Length Subarrays	Solution	Easy
1798	Max Number of K-Sum Pairs	Solution	Medium
1894	Merge Strings Alternately	Solution	Easy
2265	Partition Array According to Given Pivot	Solution	Medium
2728	Sum in a Matrix	Solution	Medium