leetcode第13题--Roman to Integer

Problem：

Given a roman numeral, convert it to an integer.

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

遍历一次输入的字符串，如果不满足类似4或者9的就直接加相应的数，否则减去相应的数。其中对应如下”IVXLCDM“对应{1,5,10,50,100,500,1000}

class Solution {

public:

int romanToInt(string s)

{

    string refe = "IVXLCDM";

    int val[] = {, , , , , , };

    int result = ;

    for (int i = ; i < s.size(); i++)

    {

        for (int j = ; j < refe.length(); j++)

        {

            if (i+<s.size() && s[i] == refe[j] && ((j+<refe.size() && s[i+] == refe[j+]) || (j+<refe.size() && s[i+] == refe[j+])))

            {result -= val[j];}

            else if (s[i] == refe[j])

            {result += val[j];}

        }

    }

    return result;

}

};