Roman to Integer -- leetcode

Given a roman numeral, convert it to an integer.

Input is guaranteed to be within the range from 1 to 3999.

class Solution {
public:
    int romanToInt(string s) {
        int weight[26];
        int *map = &weight[-'A'];
        map['I'] =  1; map['V'] =   5; map['X'] = 10;
        map['L'] = 50; map['C'] = 100; map['D'] = 500;
        map['M'] = 1000;

        int result = 0;
        for (int i=0; i


转换比较简单， 比后面大或等，则累加；比后面小，则累减。