1. Remove All Adjacent Duplicates In String

1. Remove Duplicates from Sorted Array

1. Best Time to Buy and Sell Stock II

1. Contains Duplicate

1. Single Number

需要了解位运算

1. Intersection of Two Arrays II

1. Plus One

1. Move Zeroes

1. Two Sum

48. Rotate Image

1. Reverse String

1. Reverse Integer

1. First Unique Character in a String

1. Valid Palindrome

1. Find the Index of the First Occurrence in a String

更优解法待补充

1. String to Integer (atoi)

有限状态自动机算法补充(已完成)

1. Longest Common Prefix 暴力解法

   更优解法待补充(已补充)

deleteNode

removeNthFromEnd

reverseList

mergeTwoLists

isPalindrome

hasCycle

maxDepth

merge

isSymmetric (递归) not fixed