摘要: A reversible prime in any number system is a prime whose "reverse" in that number system is also a prime. For example in the decimal system 73 is a re 阅读全文
posted @ 2020-06-24 17:56 Veritas_des_Liberty 阅读(197) 评论(0) 推荐(0) 编辑
摘要: A long-distance telephone company charges its customers by the following rules: Making a long-distance call costs a certain amount per minute, dependi 阅读全文
posted @ 2020-06-24 17:30 Veritas_des_Liberty 阅读(185) 评论(0) 推荐(0) 编辑
摘要: Suppose a bank has K windows open for service. There is a yellow line in front of the windows which devides the waiting area into two parts. All the c 阅读全文
posted @ 2020-06-24 15:22 Veritas_des_Liberty 阅读(189) 评论(0) 推荐(0) 编辑