08 2017 档案
摘要：The harmonic value of the permutation p1,p2,⋯pn is ∑i=1n−1gcd(pi.pi+1) Mr. Frog is wondering about the permutation whose harmonic value is the strictl
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摘要：题目很简单，就是求表达式（P/D）的结果是不是整数。其中P是一个整系数的多项式，D是一个正整数。 把1-k（最高次）+1都试一次就好了。结论可以总结归纳得到。（k取 0， 1， 2 .... 的情况推一次，可以推出结论）。
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摘要：题目大意是： 在一个m行n列的矩形网格中放置k个相同的石子，问有多少种方法？每个格子最多放一个石子，所有石子都要用完，并且第一行、最后一行、第一列、最后一列都要有石子。 容斥原理。如果只是n * m放石子,那么最后的结果，就是C(n*m,k).我们设A为第一行不放石头的总数,B为最后一行不放石子的总
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摘要：Given a decimal integer number you will have to find out how many trailing zeros will be there in itsfactorial in a given number system and also you w
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摘要：frog is now a editor to censor so-called sensitive words (敏感词). She has a long text (p). Her job is relatively simple -- just to find the first occure
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摘要：Before ACM can do anything, a budget must be prepared and the necessary financial support obtained. The main income for this action comes from Irrever
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摘要：Ignatius has just come back school from the 30th ACM/ICPC. Now he has a lot of homework to do. Every teacher gives him a deadline of handing in the ho
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摘要：ACM (ACMers' Chatting Messenger) is a famous instant messaging software developed by Marjar Technology Company. To attract more users, Edward, the bos
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摘要：Now I think you have got an AC in Ignatius.L's "Max Sum" problem. To be a brave ACMer, we always challenge ourselves to more difficult problems. Now y
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摘要：As we all know, Coach Gao is a talented chef, because he is able to cook M dishes in the same time. Tonight he is going to have a hearty dinner with h
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