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Farmer John went to cut some wood and left N (2 ≤ N ≤ 100,000) cows eating the grass, as usual. When he returned, he found to his horror that the clus 阅读全文
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King Mercer is the king of ACM kingdom. There are one capital and some cities in his kingdom. Amazingly, there are no roads in the kingdom now. Recent 阅读全文
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Data mining huge data sets can be a painful and long lasting process if we are not aware of tiny patterns existing within those data sets. One reputab 阅读全文
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Problem Description A permutation p1,p2,...,pn of 1,2,...,n is called a lucky permutation if and only if pi≡0(mod|pi−pi−2|) for i=3...n. Now you need 阅读全文