摘要：
Given a string containing only digits, restore it by returning all possible valid IP address combinations. For example:Given "25525511135",return ["25... 阅读全文
摘要：
A message containing letters from A-Z is being encoded to numbers using the following mapping:'A' -> 1'B' -> 2...'Z' -> 26Given an encoded message con... 阅读全文
摘要：
Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining.... 阅读全文
摘要：
'?' Matches any single character.'*' Matches any sequence of characters (including the empty sequence).The matching should cover the entire input stri... 阅读全文