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D.Omkar and Bed Wars \(Description:\) $n$个人站成一个圈,$i$的右边是$i+1$,$n$的右边是$1$。他们初始有一个朝向(朝左/右)。每次操作可以让一个人转向(左变右或相反)。要求不出现连续三个朝左或连续三个朝右的人,求最小操作数 \(Solution:\ 阅读全文
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Description Any case of shuffling of n cards can be described with a permutation of 1 to n. Thus there are totally n! cases of shuffling. Now suppose 阅读全文
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A permutation of length n is an array containing each integer from 1 to n exactly once. For example, q = [4, 5, 1, 2, 3] is a permutation. For the per 阅读全文
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Description Farmer John's N (1 ≤ N ≤ 10,000) cows are lined up to be milked in the evening. Each cow has a unique "grumpiness" level in the range 1... 阅读全文