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

以前面试遇到过，磕磕巴巴写出来http://blog.csdn.net/ymhhym/article/details/23594753；重写，比较清楚简短。

class Solution {
public:
string convertToTitle(int n) {
string result;
while (n > 0) {
int rmod = n % 26;
n /= 26;
if (rmod == 0) {
result.push_back('Z');
n -= 1;
}
else {
result.push_back('A' + rmod - 1);
}

}
reverse(result.begin(), result.end());

return result;
}
};