Excel Sheet Column Title

Excel Sheet Column Title

Total Accepted: 45878 Total Submissions: 230128 Difficulty: Easy

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 {
public:
    string convertToTitle(int n) {
        string res;
        while(n){
            int r = (n-1)%26;
            res.push_back('A' + r);
            n = (n-1)/26;
        }
        reverse(res.begin(),res.end());
        return res;
    }
};