Excel Sheet Column Title

Given a positive integer, return its corresponding column title as appear in an Excel sheet.

For example:

  1.     1 -> A
  2.     2 -> B
  3.     3 -> C
  4.     ...
  5.     26 -> Z
  6.     27 -> AA
  7.     28 -> AB

Solution:

  1. public class Solution {
  2.   public String convertToTitle(int n) {
  3.     String res = "";
  5.     while (n >= 1) {
  6.       res = (char)('A' + (n - 1) % 26) + res;
  7.       n = (n - 1) / 26;
  8.     }
  10.     return res;
  11.   }
  12. }