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Favourite Number 题目描述 Volodymyr’s favourite number is A and it has an odd number of positive divisors. When you add K to this number, the resulting su 阅读全文
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问题 G: Mad Veterinarian 题目描述 Mad Veterinarian puzzles have a mad veterinarian, who has developed several machines that can transform an animal into one 阅读全文
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【 哈希和哈希表】Three Friends 题目描述 Three friends like to play the following game. The first friend chooses a string S. Then the second friend constructs a ne 阅读全文
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问题 E: Plug It In! 题目描述 Adam just moved into his new apartment and simply placed everything into it at random. This means in particular that he did not 阅读全文