Given a positive integer, return its corresponding column title as appear in an Excel sheet.
For example:
1 -> A 2 -> B 3 -> C ... 26 -> Z 27 -> AA 28 -> AB ...
Example 1:
Input: 1 Output: "A"
Example 2:
Input: 28 Output: "AB"
Example 3:
Input: 701 Output: "ZY"
class Solution {
public:
string convertToTitle(int n) {
return n == 0 ? "" : convertToTitle(n / 26) + (char) (--n % 26 + 'A');
}
};