LeetCode

​ 自己刷LeetCode整理的一些题解笔记。

​ 每道题使用Java实现。

​ 有什么错误及不足之处欢迎指出。

​ ----------------------- 开始备战秋招，每日必刷2题！ --------------------

ID	Title	Difficulty	Tag
1	Two Sum	easy
2	Add Two Numbers	medium
5	Longest Palindromic Substring	medium
7	Reverse Integer	easy
11	Container With Most Water	medium
17	Letter Combinations of a Phone Number	medium	Backtracking
19	Remove Nth Node From End of List	medium	Linked List
20	Valid Parentheses	easy
21	Merge Two Sorted Lists	easy	Linked List
22	Generate Parentheses	medium
26	Remove Duplicates from Sorted Array	easy
27	Remove Element	easy
33	Search in Rotated Sorted Array	medium
34	Find First and Last Position of Element in Sorted Array	medium
37	Sudoku Solver	hard
39	Combination Sum	medium
41	First Missing Positive	hard
42	Trapping Rain Water	hard
45	Jump Game II	hard
46	Permutations	medium
48	Rotate Image	medium
49	Group Anagrams	medium
51	N-Queens	hard
53	Maximum Subarray	easy	Dynamic Programming
55	Jump Game	medium
56	Merge Intervals	medium
62	Unique Paths	medium	Dynamic Programming
70	Climbing Stairs	easy
72	Edit Distance	hard	Dynamic Programming
75	Sort Colors	medium
78	Subsets	medium
79	Word Search	medium	Backtracking
80	Remove Duplicates from Sorted Array II	medium
84	Largest Rectangle in Histogram	hard
94	Binary Tree Inorder Traversal	medium	Tree
96	Unique Binary Search Trees	medium	Tree
98	Validate Binary Search Tree	medium	Tree
100	Same Tree	easy	Tree
101	Symmetric Tree	easy	Tree
102	Binary Tree Level Order Traversal	medium	Tree
104	Maximum Depth of Binary Tree	easy	Tree
105	Construct Binary Tree from Preorder and Inorder Traversal	medium	Tree
106	Construct Binary Tree from Inorder and Postorder Traversal	medium	Tree
107	Binary Tree Level Order Traversal II	easy	Tree
110	Balanced Binary Tree	easy	Tree
111	Minimum Depth of Binary Tree	medium	Tree
112	Path Sum	easy	Tree
114	Flatten Binary Tree to Linked List	medium
121	Best Time to Buy and Sell Stock	easy
122	Best Time to Buy and Sell Stock II	medium
125	Valid Palindrome	easy
128	Longest Consecutive Sequence	hard
136	Single Number	easy	Bit Manipulation
139	Word Break	medium
141	Linked List Cycle	easy	Linked List
142	Linked List Cycle II	medium
146	LRU Cache	medium
155	Min Stack	easy
160	Intersection of Two Linked Lists	east	Linked List
169	Majority Element	easy	Array
198	House Robber	easy	Dynamic Programming
200	Number of Islands	medium
206	Reverse Linked List	easy	Linked List
207	Course Schedule	medium
208	Implement Trie (Prefix Tree)	medium
221	Maximal Square	medium
226	Invert Binary Tree	easy	Tree
234	Palindrome Linked List	easy	Linked List
235	Lowest Common Ancestor of a Binary Search Tree	easy
236	Lowest Common Ancestor of a Binary Tree	medium
238	Product of Array Except Self	medium
239	Sliding Window Maximum	hard
240	Search a 2D Matrix II	medium
257	Binary Tree Paths	easy
279	Perfect Squares	medium
283	Move Zeroes	easy	Array
287	Find the Duplicate Number	medium
295	Find Median from Data Stream	hard
297	Serialize and Deserialize Binary Tree	hard
300	Longest Increasing Subsequence	medium
301	Remove Invalid Parentheses	hard
309	Best Time to Buy and Sell Stock with Cooldown	medium
312	Burst Balloons	hard
315	Count of Smaller Numbers After Self	hard
322	Coin Change	medium
337	House Robber III	medium
338	Counting Bits	medium
344	Reverse String	easy
347	Top K Frequent Elements	medium
394	Decode String	medium
406	Queue Reconstruction by Height	medium
416	Partition Equal Subset Sum	medium
429	N-ary Tree Level Order Traversal	medium
437	Path Sum Ⅲ	easy	Tree
448	Find All Numbers Disappeared in an Array	easy	Array
461	Hamming Distance	easy	Bit Manipulation
494	Target Sum	medium
513	Find Bottom Left Tree Value	medium	Tree
515	Find Largest Value in Each Tree Row	medium	Tree
538	Convert BST to Greater Tree	easy	Tree
543	Diameter of Binary Tree	easy	Tree
547	Friend Circles	medium
559	Maximum Depth of N-ary Tree	easy	Tree
560	Subarray Sum Equals K	medium
572	SubTree of Another Tree	easy	Tree
581	Shortest Unsorted Continuous Subarray	easy
617	Merge Two Binary Trees	easy	Tree
621	Task Scheduler	medium
647	Palindromic Substrings	medium
714	Best Time to Buy and Sell Stock with Transaction Fee	medium
739	Daily Temperatures	medium
752	Open the Lock	medium
773	Sliding Puzzle	hard
994	Rotting Oranges	medium	BFS