摘要: Friday the ThirteenthIs Friday the 13th really an unusual event?That is, does the 13th of the month land on a Friday less often than on any other day ... 阅读全文
posted @ 2015-02-16 19:21 BlackStorm 阅读(402) 评论(0) 推荐(0) 编辑
摘要: Greedy Gift GiversA group of NP (2 ≤ NP ≤ 10) uniquely named friends has decided to exchange gifts of money. Each of these friends might or might not ... 阅读全文
posted @ 2015-02-16 17:46 BlackStorm 阅读(357) 评论(0) 推荐(0) 编辑
摘要: Your Ride Is HereIt is a well-known fact that behind every good comet is a UFO. These UFOs often come to collect loyal supporters from here on Earth. ... 阅读全文
posted @ 2015-02-16 17:24 BlackStorm 阅读(384) 评论(0) 推荐(0) 编辑