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Post Office Description There is a straight highway with villages alongside the highway. The highway is represented as an integer axis, and the positi 阅读全文
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[USACO10DEC]牛的健美操Cow Calisthenics 题目描述 Farmer John continues his never-ending quest to keep the cows fit by having them exercise on various cow paths 阅读全文
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[USACO07DEC]观光奶牛Sightseeing Cows 题目描述 Farmer John has decided to reward his cows for their hard work by taking them on a tour of the big city! The cow 阅读全文
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P3047 [USACO12FEB]附近的牛Nearby Cows 题目描述 Farmer John has noticed that his cows often move between nearby fields. Taking this into account, he wants to p 阅读全文
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Description A sequence of N positive integers (10 < N < 100 000), each of them less than or equal 10000, and a positive integer S (S < 100 000 000) ar 阅读全文
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sum Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 3295 Accepted Submission(s): 1210 Problem D 阅读全文
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Description从 n 个不同元素中任取 m(m≤n)个元素,按照一定的顺序排列起来,叫做从 n个不同元素中取出 m 个元素的一个排列。当 m=n 时所有的排列情况叫全排列。你觉得 xxy 会问你全排列的个数吗?Xxy:这个问题能淹死你,我才不问呢。我要问的是求 n 的全排列中,先递增后递减、 阅读全文