摘要： 2. Missing number 转自：https://mp.weixin.qq.com/s/WLRXLdi-3igkjtiWlHg7Ug Given a positive integer n(n≤40), pick n-1 numbers randomly from 1 to n and con 阅读全文

摘要： For two rational numbers, your task is to implement the basic arithmetics, that is, to calculate their sum, difference, product and quotient. Input Sp 阅读全文