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1、hdu 1796 How many integers can you find 容斥典型问题:求在给定区间内,能被给定集合至少一个数整除的数个数 方法:将给出的n个整除的数进行二进制枚举(2^n),计算ai所能组成的各种集合(这里将集合中ai的最小公倍数作为除数)在区间中满足的数的个数,然后利用 阅读全文
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Description We all know that Bin-Laden is a notorious terrorist, and he has disappeared for a long time. But recently, it is reported that he hides in 阅读全文
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Description People in Silverland use square coins. Not only they have square shapes but also their values are square numbers. Coins with values of all 阅读全文
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Description "Well, it seems the first problem is too easy. I will let you know how foolish you are later." feng5166 says. "The second problem is, give 阅读全文
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Description Bizon the Champion isn't just a bison. He also is a favorite of the "Bizons" team. At a competition the "Bizons" got the following problem 阅读全文
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A. Rewards A. Rewards Bizon the Champion is called the Champion for a reason. Bizon the Champion has recently got a present — a new glass cupboard wit 阅读全文