这是《算法设计》书上的一些题目，每一个程序都验证过了，有2题还有小错误，希望大家能够多多指教（代码是txt格式），望可以通过啊-This is some of the topics in the book of algorithm design, and each program are verified, and question 2, there is a small error, I hope everyone will advise (code txt format), hope by!