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
class Solution {
public:
string convertToTitle(int n) {
//residue is the value of current bit (from least-significant bit)
//divided by 26, then iterate
int residue = n%, quotient=n;
string ret = "";
while(quotient>){
if(residue==) {
residue = ;
quotient -= ;
}
ret = (char)('A'+residue-) + ret;
quotient /= ;
residue = quotient %;
}
return ret;
}
};