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Jessica's a very lovely girl wooed by lots of boys. Recently she has a problem. The final exam is coming, yet she has spent little time on it. If she 阅读全文
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The zoo have N cats and M dogs, today there are P children visiting the zoo, each child has a like-animal and a dislike-animal, if the child's like-an 阅读全文
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传递闭包最开始是在Floyd-Warshall算法里面出现的，当时这算法用的很少就被我忽视了。。 传递闭包是指如果i能到达k，并且k能到达j，那么i就能到达j Have you ever read any book about treasure exploration? Have you ever 阅读全文
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有向图的最小路径覆盖=V-二分图最大匹配。 Consider a town where all the streets are one-way and each street leads from one intersection to another. It is also known that 阅读全文
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最小定点覆盖是指这样一种情况： 图G的顶点覆盖是一个顶点集合V，使得G中的每一条边都接触V中的至少一个顶点。我们称集合V覆盖了G的边。最小顶点覆盖是用最少的顶点来覆盖所有的边。顶点覆盖数是最小顶点覆盖的大小。 相应地，图G的边覆盖是一个边集合E，使得G中的每一个顶点都接触E中的至少一条边。如果只说覆 阅读全文
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D. Mike and distribution time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Mike has always 阅读全文
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C. Mike and gcd problem time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Mike has a seque 阅读全文
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The Global Aerial Research Centre has been allotted the task of building the fifth generation of mobile phone nets in Sweden. The most striking reason 阅读全文
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Thanks to a certain "green" resources company, there is a new profitable industry of oil skimming. There are large slicks of crude oil floating in the 阅读全文
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You’re giving a party in the garden of your villa by the sea. The party is a huge success, and everyone is here. It’s a warm, sunny evening, and a soo 阅读全文