A Simple Interview Question

I ran into an interview question on leetcode about a number conversion that marked as easy. It reveals the beauty of our numbering notation. Question Excel Sheet Column Title 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 ... Example 1: Input: 1 Output: "A" Example 2: Input: 28 Output: "AB" Example 3: Input: 701 Output: "ZY" Solution (Incorrect) At first glance, I thought it is just a simple conversion to a base 26 number. Read more →