题目描述 An army of ants walk on a horizontal pole of lengt […]

题目描述 A pirate's treasure map typically contains a […]

题目描述 n boxes are placed on the vertices of a rooted tre […]

题目描述 Consider a grid in which north-south streets, sepa […]

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题目描述 Consider the set of all non-negative integer power […]

题目描述 When a thin rod of length L is heated n degrees, i […]

题目描述 We say that x is a perfect square if, for some int […]

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题目描述 An infinite chessboard is obtained by extending a […]