摘要：
Given a string containing only digits, restore it by returning all possible valid IP address combinations. For example:Given "25525511135", return ["2 阅读全文
摘要：
Given an absolute path for a file (Unix-style), simplify it. For example,path = "/home/", => "/home"path = "/a/./b/../../c/", => "/c" click to show co 阅读全文
摘要：
Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there exists one unique longes 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 telepho 阅读全文