leetcode Excel Sheet Column Title

原题链接：https://leetcode.com/problems/excel-sheet-column-title/

Description

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

class Solution {
public:
string convertToTitle(int n) {
string ans = "";
while (n) {
char ch = !(n % 26) ? 'Z' : (n % 26 + 'A' - 1);
ans += ch;
n = (n - 1) / 26;
}
reverse(ans.begin(), ans.end());
return ans;
}
};