Java [Leetcode 168]Excel Sheet Column Title

题目描述：

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 

解题思路：

26进制。

代码如下：

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