leetcode - programming practice

Official Web: https://leetcode.com/problemset/algorithms/

I haven`t written code for a long time, due to reading papers all the time. So I need to practice, or I can`t find a job...

mark: compile using g++: g++ -std=c++0x file -o file

No	Question	Code
1	Two Sum	Hash Table (C++)
2	Add Two Numbers	Linked List (C++)
3	Longest Substring Without Repeating Characters	Hash Table (C++)
4	Median of Two Sorted Arrays	Divide and Conquer (C++)
5	Longest Palindromic Substring	Dynamic Programming (C++)
6	ZigZag Conversion	String (C++)
7	Reverse Integer	Math (C++)
8	String to Integer (atoi)	Math / String (C++)
9	Palindrome Number	Math (C++)
10	Regular Expression Matching	String (C++) Dynamic Programming (C++)
11	Container With Most Water	Greedy (C++)
12	Integer to Roman	Math (C++)
13	Roman to Integer	Math (C++)
14	Longest Common Prefix	String (C++)
15	3Sum	Array / Two Pointer (C++)
16	3Sum Closest	Array / Two Pointer (C++)
17	Letter Combinations of a Phone Number	Backtracking / String (C++)
208	Implement Trie (Prefix Tree)	Trie (C++)
226	Invert Binary Tree	Binary Tree (C++)

Some Usefull Code

No	Question	Code
0	bit array opperation	bit array (C++)
1	quick sort	quick sort (python)
2	KMP (string match)	KMP (C++)
3	Top K (Top K number)	Top K (heap build/sort) (C++)