Integet to Roman

class Solution {
public:
   string intToRoman(int num) {
       int numm[]={1000,900,500,400,100,90,50,40,10,9,5,4,1};
       string ans[]={"M","CM","D","CD","C","XC","L","XL","X","IX","V","IV","I"};
       string s;
       for(int i=0;i<13;i++)
       {
          while(num>=numm[i])
          {
              s=s+ans[i];
              num=num-numm[i];
          }
       }
        return s;
    }
};