LeetCode[Math]: 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

這個問題非常簡單，我的C++代碼實現如下：

string convertToTitle(int n) {
    string res;
    while (n--) {
        char element = ('A' + n % 26);
        res = element + res;
        n /= 26;
    }

    return res;
}

時間性能如下圖所示：