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There are nn piles of stones, where the ii -th pile has aiai stones. Two people play a game, where they take alternating turns removing stones. In a m 阅读全文
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Two mages play the game. Both of them has their own set of creatures. Each creature is characterized by the integer — its strength. At the beginning o 阅读全文
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You are given a tree with nn vertices and (n−1)(n−1) edges. At the beginning its edges and vertices are not painted. You can perform the following ope 阅读全文
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There are 4 bars, possibly, having different lengths. Can they be used as the legs of the table, such that: The legs stay vertically in the vertices o 阅读全文
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Alice, Beto, and Carlos are playing with twine. Alice starts by pulling taut the string of twine, then she folds it and holds the string at the fold. 阅读全文