/*

Author: King, wangjingui@outlook.com

Date: Dec 19, 2014

Problem: Excel Sheet Column Title

Difficulty: Easy

Source: https://oj.leetcode.com/problems/excel-sheet-column-title/

Notes:

Given a non-zero 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

Solution: 1. Iteration.

2&3. recursion.

*/

public class Solution {

public String convertToTitle(int n) {

StringBuffer sb = new StringBuffer();

while (n > 0) {

sb.insert(0,(char)((n - 1)%26 + 'A'));

n = (n - 1) / 26;

}

return sb.toString();

}

}