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Description Background Raymond Babbitt drives his brother Charlie mad. Recently Raymond counted 246 toothpicks spilled all over the floor in an instan 阅读全文
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题目描述 Tak has N cards. On the i-th (1≤i≤N) card is written an integer xi. He is selecting one or more cards from these N cards, so that the average of 阅读全文
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A.Easy h-index 题目描述 The h-index of an author is the largest h where he has at least h papers with citations not less than h.Bobo has published many pa 阅读全文
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题目描述 We have a large square grid with H rows and W columns. Iroha is now standing in the top-left cell. She will repeat going right or down to the adj 阅读全文
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Problem Description We define an element a_iai in a sequence "good", if and only if there exists a j(1\le j < i)j(1≤j<i) such that a_j < a_iaj<ai.G 阅读全文