LeetCode 168 Excel Sheet Column Title

168. 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

难度EASY。相当于是26进制转换，稍微做点处理。

class Solution {
public:string convertToTitle(int n) {string s = "";while(n){int x = --n % 26; s += 'A' + x;n /= 26; }reverse(s.begin(),s.end());return s;}
};

还有一种更简单的写法，避免用Reverse,直接利用递归栈的思想。
如下：

class Solution {
public:string convertToTitle(int n) {return n == 0 ? "" : convertToTitle(n / 26) + (char) (--n % 26 + 'A');}
};

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