Asimple

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 阅读全文

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）。 阅读全文

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 阅读全文

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 阅读全文

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 阅读全文

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 阅读全文

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 阅读全文

摘要： ACM (ACMers' Chatting Messenger) is a famous instant messaging software developed by Marjar Technology Company. To attract more users, Edward, the bos 阅读全文

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 阅读全文

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 阅读全文

摘要： N (1 ≤ N ≤ 100) cows, conveniently numbered 1..N, are participating in a programming contest. As we all know, some cows code better than others. Each 阅读全文

摘要： Several currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies and performs exchang 阅读全文

摘要： Problems involving the computation of exact values of very large magnitude and precision are common. For example, the computation of the national debt 阅读全文

摘要： An encoding of a set of symbols is said to be immediately decodable if no code for one symbol is the prefix of a code for another symbol. We will assu 阅读全文

摘要： Joe works in a maze. Unfortunately, portions of the maze have caught on fire, and the owner of the maze neglected to create a fire escape plan. Help J 阅读全文