leetcode

0 class Solution {

1 public:

2 string convertToTitle(int columnNumber) {

3 string res = "";

4 do {

5 columnNumber -= 1;

6 res += 'A' + columnNumber % 26;

7 } while ((columnNumber /= 26));

8 reverse(res.begin(), res.end());

9 return res;

10 }

11 };