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关于题目的理解

Posted by kicc at 2005-08-28 13:24:48 on Problem 2594
没有回路:
不存在a1,...,an
使得
a1->a2
a2->a3
...
an->a1

开采点数:
机器人选定一条路走下去会访问这条路上的结点
它可以从这些结点中选择一些进行开采
因此,机器人是可以开采对于2个点的

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