立个Flag：每天至少一道LeetCode2018-04-10

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周一参加了一个大公司笔试。一道本是很简单的题目，我写的代码却一个case也没有通过。
不得不承认，自己虽然学了一学期的算法，但是却毫无实战经验。
从现在开始，每天一题。
“唯手熟尔。”

1

Easy

#	Title	Tag
1	Two Sum	Array, Hash Table
7	Reverse Integer	Math
9	Palindrome Number	Math
13	Roman to Integer	Math, String
14	Longest Common Prefix	String
20	Valid Parentheses	Stack, String
21	Merge Two Sorted Lists	Linked List
26	Remove Duplicates from Sorted Array	Array, Two Pointers
27	Remove Element	Array, Two Pointers
28	Implement strStr()	Two Pointers, String
35	Search Insert Position	String
38	Count and Say	String
53	Maximum Subarray	Array, Dynamic Programming, Divide and Conquer
58	Length of Last Word	String
66	Plus One	Array, Math
67	Add Binary	Math, String
69	Sqrt(x)	Binary Search, Math
70	Climbing Stairs	Dynamic Programming
83	Remove Duplicates from Sorted List	Linked List
88	Merge Sorted Array	Array, Two Pointers
100	Same Tree	Tree, Depth-first Search
101	Symmetric Tree	Tree, Depth-first Search, Breadth-first Search
104	Maximum Depth of Binary Tree	Tree, Depth-first Search
107	Binary Tree Level Order Traversal II	Tree, Breadth-first Search
108	Convert Sorted Array to Binary Search Tree	Tree, Depth-first Search
110	Balanced Binary Tree	Tree, Depth-first Search
111	Minimum Depth of Binary Tree	Tree, Depth-first Search, Breadth-first Search
112	Path Sum	Tree, Depth-first Search
118	Pascal's Triangle	Array
119	Pascal's Triangle II	Array
121	Best Time to Buy and Sell Stock	Array, Dynamic Programmin
122	Best Time to Buy and Sell Stock II	Array, Greedy
543	Diameter of Binary Tree	Tree

Medium

#	Title	Tag
2	Add Two Numbers	Linked List, Math
3	Longest Substring Without Repeating Characters	Hash Table, Two Pointers, String
5	Longest Palindromic Substring	String
8	String to Integer (atoi)	Math, String
15	3Sum	Array, Two Pointers
17	Letter Combinations of a Phone Number	String, Backtracking
19	Remove Nth Node From End of List	Linked List, Two Pointers
33	Search in Rotated Sorted Array	Arrays, Binary Search
43	Multiply Strings	Math, String
49	Group Anagrams	Hash Table, String
50	Pow(x, n)	Math, Binary Search
56	Merge Intervals	Array, Sort
554	Brick Wall	Hash Table

Hard

#	Title	Tag
4	Median of Two Sorted Arrays	Array, Binary Search, Divide and Conquer
10	Regular Expression Matching	String, Dynamic Programming, Backtracking
23	Merge k Sorted Lists	Linked List, Divide and Conquer, Heap
25	Reverse Nodes in k-Group	Linked List
44	Reverse Nodes in k-Group	String, Dynamic Programming, Backtracking, Greedy
57	Insert Interval	Array, Sort
68	Text Justification	String