2019年11月26日
1023 Have Fun with Numbers (20 分)
摘要： 1023 Have Fun with Numbers (20 分) Notice that the number 123456789 is a 9-digit number consisting exactly the numbers from 1 to 9, with no duplication 阅读全文
posted @ 2019-11-26 18:12 57one 阅读(140) 评论(0) 推荐(0)
1022 Digital Library (30 分)
摘要： 1022 Digital Library (30 分) A Digital Library contains millions of books, stored according to their titles, authors, key words of their abstracts, pub 阅读全文
posted @ 2019-11-26 16:52 57one 阅读(150) 评论(0) 推荐(0)