LeetCode 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

class Solution {//怪恶心的一道题
public:
    string convertToTitle(int n) {
           string s;
           while(n!=0){
                 n-=1;
                 s.insert(s.begin(),1,'A'+n%26);
                 n/=26;
               }
           return s;
    }
};