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摘要： 题目内容： Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. 题目分析：罗马数字向阿拉伯数字的转换情况如下： 1、M=1000 D=5 阅读全文

摘要： 题目内容： Reverse digits of an integer. Example1: x = 123, return 321Example2: x = -123, return -321 题目分析：反转的方法很简单，重点在于判断溢出的问题，下面给出了两种方法。 方法一： 判断溢出方法：在执行完 阅读全文

摘要： 题目内容：Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would ha 阅读全文

摘要： 题目内容：Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would ha 阅读全文