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) { StringBuilder sb = new StringBuilder(); while (n > 0) { int apd = n % 26; char c; if (apd == 0) { c = 'Z'; n = n / 26 - 1; } else { c = (char) (apd + 'A' - 1); n = n / 26; } sb.append(c); } return sb.reverse().toString(); } }