leetcode-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 {                   //10进制转化成26进制的思想public:    string convertToTitle(int n) {        if(n<=0)            return string("");        string res;        while(n){            int temp=n%26;            if(temp==0)                temp=26;            res+='A'+(temp-1);            n=(n-1)/26;        }            reverse(res.begin(),res.end());        return res;    }};