[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 

给定一个整数，求出其在Excel对应的字母标题，利用while循环，先对整数取余(n - 1) % 26，找到数字与字母的关系，计算出最后一位的字母，然后对整数取商，计算下一位。最后将得到的结果字符串反转即可。

class Solution {
public:
    string convertToTitle(int n) {
        string s;
        int tmp = 0;
        while (n) {
            n = n - 1;
            tmp = n % 26;
            s += ('A' + tmp);
            n /= 26;
        }
        int left = 0, right = s.size() - 1;
        while (left <= right)
            swap(s[left++], s[right--]);
        return s;
    }
};
// 0 ms

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