Roman to Integer -- LeetCode 13

Given a roman numeral, convert it to an integer.

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

roman numerals: https://en.wikipedia.org/wiki/Roman_numerals

Solution 1:

class Solution
{
public:
    inline int romanInt(const char c)
    {
        switch(c)
        {
            case 'I': return ;
            case 'V': return ;
            case 'X': return ;
            case 'L': return ;
            case 'C': return ;
            case 'D': return ;
            case 'M': return ;
            default: return ;
        }
    }

    int romanToInt(string s)
    {
        int result = ;
        for(size_t i = ; i < s.size(); ++i)
        {
            if(i >  && romanInt(s[i]) > romanInt(s[i - ]))
            {
                result += (romanInt(s[i]) -  * romanInt(s[i - ]));
            }
            else
                result += romanInt(s[i]);
        }
        return result;
    }
};

Solution 2: