Solve this way(c++ solution)


#1

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 Solution::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; 

}