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Description One of Timofey's birthday presents is a colourbook in a shape of an infinite plane. On the plane n rectangles with sides parallel to coord 阅读全文
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Description Each New Year Timofey and his friends cut down a tree of n vertices and bring it home. After that they paint all the n its vertices, so th 阅读全文
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Description Young Timofey has a birthday today! He got kit of n cubes as a birthday present from his parents. Every cube has a number ai, which is wri 阅读全文
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Description Comrade Dujikov is busy choosing artists for Timofey's birthday and is recieving calls from Taymyr from Ilia-alpinist. Ilia-alpinist calls 阅读全文