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## 频道

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+ rrrrr ##dgwegds  ljboioi 

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Problem Description Recently, iSea went to an ancient country. For such a long time, it was the mos

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Problem Description Lemon wants to be a hero since he was a child. Recently he is reading a book ca

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Problem Description It was ten thousand years, after Demon Lemon caught Yifenfei’s love. In order t

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Problem Description With the new recruiting season's coming, lots of famous corporations come on ca

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Problem Description The expression N!, reads as the factorial of N, denoting the product of the fir

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Problem Description Consider a cube of size 3 * 3 * 3. Let us number the 27 blocks in it as follows

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Problem Description Each of three baskets contains a certain number of marbles. You may move from o

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Problem Description Mr. Chou is the atworld diamond dealer. It is important that he knows the valu

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Problem Description The local skating park has been given a nancial incentive by the city to make t

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Problem Description The ACM Student Chapter has just been given custody of a number of school b

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Problem Description The set of cyclic rotations of a string are the strings obtained by embedding t

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Problem Description Traditionally after the Local Contest, judges and contestants go to their favou

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Problem Description After travelling around for years, Salesman John has decided to settle. He want

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Problem Description Slitherlink is a type of logic puzzle made popular by Nikoli, the same Japanese

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Problem Description 对于表达式n^2+n+41，当n在（x,y）范围内取整数值时（包括x,y）(-39<=x<y<=50)，判定该表达式的值是否都为素数。

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Problem Description 假设一堆由1分、2分、5分组成的n个硬币总面值为m分，求一共有多少种可能的组合方式（某种面值的硬币可以数量可以为0）。 Input 输入数据第一

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Problem Description 定义：一个词组中每个单词的首字母的大写组合称为该词组的缩写。 比如，C语言里常用的EOF就是end of file的缩写。 Input 输入的