摘要：
Given a linked list, remove thenthnode from the end of list and return its head.For example, Given linked list: 1->2->3->4->5, and n = 2. After re... 阅读全文
摘要：
Write a function to find the longest common prefix string amongst an array of strings.思路： 很简单，其他字符串和第一个字符串比较，一个一个字符比较，反正最长不会超过第一个字符串的长度。class Solution... 阅读全文
摘要：
Given a digit string, return all possible letter combinations that the number could represent.A mapping of digit to letters (just like on the telephon... 阅读全文