romToInt.cpp

#include <iostream>
#include <string>
using namespace std;

class Solution {
public:
    int romanToInt(string s) {
        int total = 0;
        for(int i = 0;i<s.length();i++){
            if(s[i] == 'I'){
                if(s[i+1] == 'V'){
                    total += 4;
                    i++;
                }else if(s[i+1] == 'X'){
                    total += 9;
                    i++;
                }else{
                    total += 1;
                }
            }else if(s[i] == 'V'){
                total += 5;
            }else if(s[i] == 'X'){
                if(s[i+1] == 'L'){
                    total += 40;
                    i++;
                }else if(s[i+1] == 'C'){
                    total += 90;
                    i++;
                }else{
                    total += 10;
                }
            }else if(s[i] == 'L'){
                total += 50;
            }else if(s[i] == 'C'){
                if(s[i+1] == 'D'){
                    total += 400;
                    i++;
                }else if(s[i+1] == 'M'){
                    total += 900;
                    i++;
                }else{
                    total += 100;
                }
            }else if(s[i] == 'D'){
                total += 500;
            }else if(s[i] == 'M'){
                total += 1000;
            }
        }

        return total;
    }
};

int main(){

    Solution s1;
    string s;
    cout<<"Enter String here: ";
    cin>>s;

    cout<<s1.romanToInt(s);

    return 0;
}