2020年6月19日
1022 Digital Library
摘要： A Digital Library contains millions of books, stored according to their titles, authors, key words of their abstracts, publishers, and published years 阅读全文
posted @ 2020-06-19 15:37 Veritas_des_Liberty 阅读(280) 评论(0) 推荐(0)
1023 Have Fun with Numbers
摘要： Notice that the number 123456789 is a 9-digit number consisting exactly the numbers from 1 to 9, with no duplication. Double it we will obtain 2469135 阅读全文
posted @ 2020-06-19 14:29 Veritas_des_Liberty 阅读(240) 评论(0) 推荐(0)