Leetcode: Excel Sheet Column Title

问题：

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

解答：

将十进制转为26进制

class Solution {
public:
string convertToTitle(int n)
{
if (n < 1)
{
return "";
}
else
{
string result = "";
while (n)
{
n--;
char ch = n % 26 + 'A';
result += ch;
n /= 26;
}
reverse(result.begin(), result.end());
return result;
}
}
};

从右到左得到各位的字符，然后进行转置！