摘要： 题目： Given a positive integer, return its corresponding column title as appear in an Excel sheet. For example 简单题 阅读全文

摘要： 题目： Given two binary strings, return their sum (also a binary string). For example,a = "11"b = "1"Return "100". 阅读全文

摘要： 题目： Description: Count the number of prime numbers less than a non-negative number, n. 这个题目有提示，计算素数的方法应该不用多说。 阅读全文

摘要： 题目： Find the total area covered by two rectilinear rectangles in a 2D plane. Each rectangle is defined by its bottom left corner and top right corner 阅读全文

摘要： 题目： Related to question Excel Sheet Column Title Given a column title as appear in an Excel sheet, return its corresponding column number. For example 阅读全文

摘要： 题目： Given a non-negative integer num, repeatedly add all its digits until the result has only one digit. For example: Given num = 38, the process is l 阅读全文