James Pan

原题网址：https://leetcode.com/problems/excel-sheet-column-number/ Related to question Excel Sheet Column Title Given a column title as appear in an Excel sheet, return its corresponding column num

原题网址：https://leetcode.com/problems/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

原题网址：https://leetcode.com/problems/gray-code/ The gray code is a binary numeral system where two successive values differ in only one bit. Given a non-negative integer n representing the total