愿此行繁花似锦，再相逢依旧如故

本项目为leetCode习题解答

1. 算法采用Cpp编写，所有提交程序均AC，放心食用；
2. 多数题目一般采用了两种或两种以上的方法解答；

001~100

Index	Title	Tag	Type
1	Two Sum	Array, Hash Table	Easy
2	Add Two Numbers	Linked List, Math	Medium
5	Longest Palindromic Substring	String, Dynamic Programming	Medium
7	Reverse Integer	Math	Easy
8	String to Integer (atoi)	Math, String	Medium
9	Palindrome Number	Math	Easy
11	Container With Most Water	Array, Two Pointers	Medium
12	Integer to Roman	Math, String	Medium
13	Roman to Integer	Math, String	Easy
14	Longest Common Prefix	String	Easy
15	3Sum	Array, Two Pointers	Medium
16	3Sum Closest	Array, Two Pointers	Medium
19	Remove Nth Node From End of List	Linked List, Two Pointers	Medium
20	Valid Parentheses	Stack, String	Easy
21	Merge Two Sorted Lists	Linked List	Easy
22	Generate Parentheses	Backtracking, String	Medium
24	Swap Nodes in Pairs	Linked List	Medium
26	Remove Duplicates from Sorted Array	Array, Two Pointers	Easy
27	Remove Element	Array, Two Pointers	Easy
28	Implement strStr()	Two Pointers, String	Easy
33	Search in Rotated Sorted Array	Array, Binary Search	Medium
34	Find First and Last Position of Element in Sorted Array	Array, Binary Search	Medium
35	Search Insert Position	Array, Binary Search	Easy
36	Vaild Sudoku	Hash Table	Medium
38	Count and Say	String	Easy
48	Rotate Image	Array	Medium
53	Maximum Subarray	Array, Divide and Conquer, Dynamic Programming	Easy
54	Spiral Matrix	Array	Medium
56	Merge Intervals	Sort, Array	Medium
58	Length of Last Word	String	Easy
59	Spiral Matrix II	Array	Medium
62	Unique Paths	Array, Dynamic Programming	Medium
66	Plus One	Array, Math	Easy
67	Add Binary	Math, String	Easy
69	Valid Perfect Square	Math, Binary Search	Easy
70	Climbing Stairs	Array	Easy
74	Search a 2D Matrix	Array, Binary Search	Medium
75	Sort Colors	Sort, Array, Two Pointers	Medium
80	Remove duplicates from sorted arrays II	Array, Two Pointers	Medium
81	Search in Rotated Sorted Array II	Array, Binary Search	Medium
82	Remove Duplicates from Sorted List Ⅱ	Linked List	Medium
83	Remove Duplicates from Sorted List	Linked List	Easy
86	Partition List	Linked List, Two Pointers	Medium
88	Merge Sorted Array	Array, Two Pointers	Easy
92	Reverse Linked List II	Linked List	Medium
94	Binary Tree Inorder Traversal	Stack, Tree, Hash Table	Medium
100	Same Tree	Tree, DFS	Easy

101~200

Index	Title	Tag	Type
101	Symmetric Tree	Tree, BFS, DFS	Easy
102	Binary Tree Level Order Traversal	Tree, BFS	Medium
104	Maximum Depth of Binary Tree	Tree, DFS	Easy
107	Binary Tree Level Order Traversal II	Tree, BFS	Easy
108	Convert Sorted Array to Binary Search Tree	Tree, DFS	Easy
109	Convert Sorted List to Binary Search Tree	Linked List, DFS	Medium
110	Balanced Binary Tree	Tree, DFS	Easy
118	Pascal's Triangle	Array	Easy
119	Pascal's Triangle Ⅱ	Array	Easy
121	Best Time to Buy and Sell Stock	Array, Dynamic Programming	Easy
122	Best Time to Buy and Sell Stock II	Array, Greedy	Easy
125	Valid Palindrome	Two Pointers, String	Easy
136	Single Number	Bit Manipulation, Hash Table	Easy
138	Copy List with Random Pointer	Hash Table, Linked List	Medium
141	Linked List Cycle	Linked List, Two Pointers	Easy
142	Linked List Cycle II	Linked List, Two Pointers	Medium
143	Reorder List	Linked List	Medium
144	Binary Tree Preorder Traversal	Stack, Tree	Medium
145	Binary Tree Postorder Traversal	Stack, Tree	Hard
147	Insertion Sort List	Linked List, Sort	Medium
148	Sort List	Linked List, Sort	Medium
151	Reverse Words in a String	String	Medium
160	Intersection of Two Linked Lists	Linked List	Easy
162	Find Peak Element	Array, Binary Search	Medium
167	Two Sum - Input array is sorted Ⅱ	Array, Two Pointers, Binary Search	Easy
169	Majority Element	Bit Manipulation, Array, Divide and Conquer	Easy
179	Largest Number	Sort	Medium
189	Rotate Array	Array	Easy

201~300

Index	Title	Tag	Type
203	Remove Linked List Elements	Linked List	Easy
209	Minimum Size Subarray Sum	Array, Two Pointers, Binary Search	Medium
215	Kth Largest Element in an array	Heap, Divide and Conquer	Medium
217	Contains Duplicate	Array, Hash Table	Easy
226	[ Invert Binary Tree][226]	Tree	Easy
229	Majority Element II	Array	Medium
238	Product of Array Except Self	Array	Medium
278	First Bad Version	Binary Search	Easy
283	Move Zeroes	Array, Two Pointers	Easy
287	Find the Duplicate Number	Array, Two Pointers, Binary Search	Medium
292	Nim Game	Brainteaser	Easy

301~400

Index	Title	Tag	Type
328	Odd Even Linked List	Linked List	Medium
344	Reverse String	Two Pointers, String	Easy
345	Reverse a Vowels of a String	Two Pointers, String	Easy
347	Top K Frequent Elements	Heap, Hash Table	Medium
349	Intersection of Two Arrays	Sort, Hash Table, Two Pointers, Binary Search	Easy
350	Intersection of Two Arrays Ⅱ	Sort, Hash Table, Two Pointers, Binary Search	Easy
367	Valid Perfect Square	Math, Binary Search	Easy
374	Guess Number Higher or Lower	Binary Search	Easy

401~500

Index	Title	Tag	Type
443	String Compression	String	Easy
445	Add Two Numbers II	Linked List	Medium
459	Repeated Substring Pattern	String	Easy
485	Max Consecutive Ones	Array	Easy
496	Next Greater Element I	Stack	Easy

501~600

Index	Title	Tag	Type
503	Next Greater Element II	Stack	Medium
556	Next Greater Element III	String	Medium
557	Reverse Words in a String III	String	Easy
561	Array Partition Ⅰ	Array	Easy

601~700

Index	Title	Tag	Type
637	Average of Levels in Binary Tree	Tree	Easy
695	Max Area of Island	Depth-first Search, Array	Easy

701~800

Index	Title	Tag	Type
704	Binary Search	Binary Search	Easy
724	Find Pivot Index	Array	Easy
747	Largest Number At Least Twice of Others	Array	Easy

801~900

Index	Title	Tag	Type
852	Peak Index in a Mountain Array	Binary Search	Easy
876	Middle of the Linked List	Linked List	Easy

901~1000

Index	Title	Tag	Type
915	Partition Array into Disjoint Intervals	Array	Medium