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E. Frog Fights 题目连接： http://www.codeforces.com/contest/625/problem/E Description stap Bender recently visited frog farm and was inspired to create his 阅读全文
posted @ 2016-02-22 23:59
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F. The Sum of the k th Powers 题目连接： http://www.codeforces.com/contest/622/problem/F Description There are well known formulas: , , . Also mathematicia 阅读全文
posted @ 2016-02-22 14:55
qscqesze
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Rikka with Phi 题目连接： http://acm.hdu.edu.cn/showproblem.php?pid=5634 Description Rikka and Yuta are interested in Phi function (which is known as Euler 阅读全文
posted @ 2016-02-22 13:23
qscqesze
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Rikka with Graph 题目连接： http://acm.hdu.edu.cn/showproblem.php?pid=5631 Description As we know, Rikka is poor at math. Yuta is worrying about this situa 阅读全文
posted @ 2016-02-22 12:10
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E. Famil Door and Roads 题目连接： http://www.codeforces.com/contest/629/problem/E Description Famil Door’s City map looks like a tree (undirected connecte 阅读全文
posted @ 2016-02-22 00:55
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