romanToDec.txt

class Solution {
public:
    int value(char r) 
{ 
    if (r == 'I') 
        return 1; 
    if (r == 'V') 
        return 5; 
    if (r == 'X') 
        return 10; 
    if (r == 'L') 
        return 50; 
    if (r == 'C') 
        return 100; 
    if (r == 'D') 
        return 500; 
    if (r == 'M') 
        return 1000; 
  
    return -1; 
} 
    int romanToInt(string str) 
{ 
    int res = 0; 
    for (int i = 0; i < str.length(); i++) { 
        int s1 = value(str[i]); 
        if (i + 1 < str.length()) { 
            int s2 = value(str[i + 1]); 
            if (s1 >= s2) 
                res = res + s1; 
            else 
            { 
                res = res + s2 - s1; 
                i++; 
            } 
        } 
        else 
        { 
           res = res + s1; 
        } 
    } 
    return res; 
} 
};