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
十进制转26进制的问题。注意每次有n-1是因为‘A’=1
class Solution {
public String convertToTitle(int n) {
String res="";
while(n!=0){
char temp = (char)('A'+(n-1)%26);
res = temp+res;
n = (n-1)/26;
}
return res;
}
}