描述: 将一个字符串表示的罗马数字转为整数,范围0~3999 解决: 如果后一个比前一个大,则表示减,没什么技巧. map<}, {}, {}, {}, {}, {}, {}}; int romanToInt(string s) { ; ; for (auto i : s) { if (m[i] > last) { ret = ret - last - last + m[i]; last = ; } else ret = ret + m[i]; last = m[i]; } return re…

题目描述 罗马数字包含以下七种字符:I, V, X, L,C,D 和 M. 字符 数值 I 1 V 5 X 10 L 50 C 100 D 500 M 1000 例如, 罗马数字 2 写做 II ,即为两个并列的 1.12 写做 XII ,即为 X + II . 27 写做 XXVII, 即为 XX + V + II . 通常情况下,罗马数字中小的数字在大的数字的右边.但也存在特例,例如 4 不写做 IIII,而是 IV.数字 1 在数字 5 的左边,所表示的数等于大数 5 减小数 1 得到的数…

13. Roman to Integer Easy Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M. Symbol Value I 1 V 5 X 10 L 50 C 100 D 500 M 1000 For example, two is written as II in Roman numeral, just two one's added together. Twelve i…

Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M. Symbol Value I 1 V 5 X 10 L 50 C 100 D 500 M 1000 For example, two is written as II in Roman numeral, just two one's added together. Twelve is written as, XII, which i…

1.题目: 原题:Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. Subscribe to see which companies asked this questio 解析:给出一个罗马数字,要求把其转换为一个整数.输入范围在1到3999内. 罗马数字的规则如下: 罗马数字 I V X L C D M 代表的阿拉伯数字 1 5…

问题描述: Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. 解题思路: 上一题反过来就可以了,其实觉得这两道题很没有意思. 代码如下: public class Solution { public int romanToInt(String s) { int result; if (s == null || s.length()…

题意: Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M. Symbol Value I 1 V 5 X 10 L 50 C 100 D 500 M 1000 For example, two is written as II in Roman numeral, just two one's added together. Twelve is written as, XII, whi…

题目要求 Roman numerals are represented by seven different symbols: I, V, X, L, C, Dand M. Symbol Value I 1 V 5 X 10 L 50 C 100 D 500 M 1000 For example, two is written as II in Roman numeral, just two one's added together. Twelve is written as, XII, whi…

Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M. Symbol Value I 1 V 5 X 10 L 50 C 100 D 500 M 1000 For example, two is written as II in Roman numeral, just two one's added together. Twelve is written as, XII, which i…

一.题目链接:https://leetcode.com/problems/roman-to-integer/ 二.题目大意: 给定一个罗马数字,返回它的整数形式. 三.题解: 这道题与12题恰好相反,关键之处在于罗马数字的组成规律.首先,弄清楚每个罗马字母对应的数字大小: 实质上,对于一个罗马数字,只需遍历它的每个字母,然后将字母对应的数字逐一相加即可,但是如果后一个字母对应的数字比相邻的前一个字母对应的数字大的话,那么这两个字母对应的数值实际上是大的数字减去小的数字,而不是两个数字的和.举个例…