Roman to Integer

Given a roman numeral, convert it to an integer.

Input is guaranteed to be within the range from 1 to 3999.

  inline int c2n(char c) {

       switch(c) {

         case 'I': return ;

         case 'V': return ;

         case 'X': return ;

         case 'L': return ;

         case 'C': return ;

         case 'D': return ;

         case 'M': return ;

         default: return ;

       }

     }

 class Solution {

 public:

     int romanToInt(string s) {

       // Start typing your C/C++ solution below

       // DO NOT write int main() function

       int result=;

       int len=s.length();

       result=c2n(s[]);

       for(int i =; i< len; i++)

       {

         if(c2n(s[i]) > c2n(s[i-]))

         {

           result +=(c2n(s[i]) - *c2n(s[i-]));

         }

         else

         {

           result += c2n(s[i]);

         }

       }

       return result;

     }

 };