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传送门 Dandelion's uncle is a boss of a factory. As the spring festival is coming , he wants to distribute rewards to his workers. Now he has a trouble a 阅读全文
posted @ 2019-02-16 23:18
千摆渡Qbd
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传送门 The country Treeland consists of n cities, some pairs of them are connected with unidirectional roads. Overall there are n - 1 roads in the countr 阅读全文
posted @ 2019-02-16 23:05
千摆渡Qbd
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传送门 The Robotics Olympiad teams were competing in a contest. There was a tree drawn on the floor, consisting of n nodes and n - 1 edges. The nodes are 阅读全文
posted @ 2019-02-16 10:24
千摆渡Qbd
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