[LeetCode] 168. Excel Sheet Column Title

Problem

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"

Solution

class Solution {
    public String convertToTitle(int n) {
        StringBuilder sb = new StringBuilder();
        
        while (n-- != 0) {
            sb.append((char)('A'+(n%26)));
            n /= 26;
        }
        return sb.reverse().toString();
    }
}