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