romantointeger.txt

int romanToInt(string s) {
    // Write your code here
    long long int sum=0;
        int i=0;
        while(i<s.size()){
            if(s[i]=='I'){
                if(i!=s.size()-1 && s[i+1]=='V'){sum+=4;i=i+2;}
                else if(i!=s.size()-1 && s[i+1]=='X'){sum=sum+9;i=i+2;}
                else{sum=sum+1;i++;}
            }else if(s[i]=='X'){
                if(i!=s.size()-1 && s[i+1]=='L'){sum+=40;i=i+2;}
                else if(i!=s.size()-1 && s[i+1]=='C'){sum=sum+90;i=i+2;}
                else{sum=sum+10;i++;}
            }else if(s[i]=='C'){
                if(i!=s.size()-1 && s[i+1]=='D'){sum+=400;i=i+2;}
                else if(i!=s.size()-1 && s[i+1]=='M'){sum=sum+900;i=i+2;}
                else{sum=sum+100;i++;}
            }else if(s[i]=='M'){sum=sum+1000;i++;}
            else if(s[i]=='V'){sum=sum+5;i++;}
            else if(s[i]=='L'){sum=sum+50;i++;}
            else if(s[i]=='D'){sum=sum+500;i++;}
//             cout<<sum<<endl;
        } 
        return sum;
}