摘要：
Given an integer, convert it to a roman numeral.Input is guaranteed to be within the range from 1 to 3999与罗马字符转数字类似，注意按级处理。string intToRoman(int num){... 阅读全文
摘要：
Given a roman numeral, convert it to an integer.Input is guaranteed to be within the range from 1 to 3999.从低位开始累加，注意一下像IV和 VI DC和CD的处理class Solution {... 阅读全文
摘要：
'.' Matches any single character.'*' Matches zero or more of the preceding element.The matching should cover the entire input string (not partial).The 阅读全文