Alternative.cs

namespace LeetCode.Problem13{
//13. Roman to Integer
//https://leetcode.com/problems/roman-to-integer/
/*
Given a roman numeral, convert it to an integer.
*/
  public class Alternative {
    
   public int RomanToInt(string s) {
        int answer = 0;
        int num = 0;
        for(int i = s.Length-1; i >= 0; i--){
            switch(s[i]){
            case 'I': num = 1;
            break;
            case 'V': num = 5;
            break;
            case 'X': num = 10;
            break;
            case 'L': num = 50;
            break;
            case 'C': num = 100;
            break;
            case 'D': num = 500;
            break;
            case 'M': num = 1000;
            break;
        }       
        if(4 * num < answer)
        {
            answer -= num;
        }
        else
        {
            answer += num;
        }
        }
        return answer;
    }
  } 
}