leetcode 168

168. Excel Sheet Column Title

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 

给定一个正整数，返回它作为出现在Excel表中的正确列向标题。相当于26进制。
代码如下：

class Solution {
public:
    string convertToTitle(int n) {
        string ss;
        while(n > 0)
        {
            ss = (char)(--n % 26 + 'A') + ss;
            n /= 26;
        }
        return ss;
    }
};