摘要: Problem DescriptionIf two people were born one after another with one second difference and one of them is a child, then the other one is a child too. We get by induction that all the people are children.Everyone knows that the mathematical department of the Ural State University is a big family of 阅读全文
posted @ 2014-03-27 16:57 chen2013 阅读(300) 评论(0) 推荐(0)
摘要: Problem DescriptionThe president of the Ural State University is going to make an 80'th Anniversary party. The university has a hierarchical structure... 阅读全文
posted @ 2014-03-27 12:09 chen2013 阅读(233) 评论(0) 推荐(0)