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Problem Statement You are given two ints: n and m. Let D be the number of permutations of the set {1,2,-,n+m} such that the first m values are not fixed points of the permutation. Formally, we are interested in permutations p such that for each j bet…
Problem Statement You are given a vector t that describes a rectangular table of zeroes and ones. Each character in t is either '0' or '1'. We say that a table is nice if there are two sequences x, y of zeroes and ones such that for each valid pair o…
# [Codeforces #312 div2 A]Lala Land and Apple Trees 首先,此题的大意是在一条坐标轴上,有\(n\)个点,每个点的权值为\(a_{i}\),第一次从原点开始走,方向自选(<- or ->),在过程中,若遇到一个权值>0的点,则将此权值计入答案,并归零.当次.此方向上的所有点均为0后,输出此时的答案. 然后,进行分析: 我们很容易想到这是一个贪心,我们将正的和负的分别存入两个数组,最初的方向为: \(zhengsum > fusum…
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