米开朗菠萝

摘要： Given two binary strings, return their sum (also a binary string). For example,a = "11"b = "1"Return "100". 题目：求2个二进制字符串的和，结果也要二进制字符串输出。 阅读全文

摘要： Given an integer, write a function to determine if it is a power of three. Follow up:Could you do it without using any loop / recursion? 判断整数是不是3的幂数 阅读全文