题目：
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
? ?
代码：
class Solution {
public:
string convertToTitle(int n)
{
????????const char ALPHA[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
????????int base = 26;
?
????????string result;
????????while (n)
????????{
????????????????int v = (n-1) % base;
????????????????result += ALPHA[v];
?
????????????????n = (n-1) / base;
????????}
?
????????reverse(result.begin(),result.end());
????????return result;
}
};
? ?
? ?
? ?
[算法练习]Excel Sheet Column Title
原文：http://www.cnblogs.com/Quincy/p/5401269.html