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
Credits:
Special thanks to
@ifanchu for adding this problem and creating all test cases.
public class Solution { public String convertToTitle(int n) { //if n<=0 return empty string; StringBuilder sb = new StringBuilder(); while(n>0) { int x = n % 26; if(x == 0) { sb.append('Z'); --n; } else { sb.append((char)('A'-1+x)); } n /= 26; } return sb.reverse().toString(); } }