摘要： https://leetcode.com/problems/longest-common-prefix/ 原题： Write a function to find the longest common prefix string amongst an array of strings. 思路： 简单 阅读全文

摘要： https://leetcode.com/problems/integer-to-roman/ 原题： Given an integer, convert it to a roman numeral. Input is guaranteed to be within the range from 1 阅读全文