Leetcode 168. Excel Sheet Column Title (Easy) (cpp)

/*

168. Excel Sheet Column Title (Easy)

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 ret = "";
while (n) {
ret = char((n - 1) % 26 + 'A') + ret;
n = (n - 1)/26;
}
return ret;
}
};