168. Excel Sheet Column Title

Problem

Given a positive integer, return its corresponding column title as appear in an Excel sheet.

Example

For example:

    1 -> A
    2 -> B
    3 -> C
    ...
    26 -> Z
    27 -> AA
    28 -> AB 
    ...

Example 1:

Input: 1
Output: "A"

Example 2:

Input: 28
Output: "AB"

Example 3:

Input: 701
Output: "ZY"

Code

static int var = [](){
    std::ios::sync_with_stdio(false);
    cin.tie(NULL);
    return 0;
}();
class Solution {
public:
    string convertToTitle(int n) {
        string res = "";
        string tmpstr = "A";
        while(n){
            n--;
            tmpstr[0] += n%26;
            res = tmpstr + res;
            tmpstr = "A";
            n = n / 26;
        }
        return res;
    }
};

Result

168. Excel Sheet Column Title.png