[leetcode] 168. Excel Sheet Column Title 解题报告

题目链接：https://leetcode.com/problems/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 

思路：和171. Excel Sheet Column Number正好反过来，并不是很难的一题。

代码如下：

class Solution {public:    string convertToTitle(int n) {        string ans;        while(n>0)        {            int k = (n-1)%26;            ans += ('A' + k);            n = (n-1)/26;        }        reverse(ans.begin(), ans.end());        return ans;    }};