[算法练习]Excel Sheet Column Title

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;

}

};

?
?

?
?

?
?