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请教大牛牛们一个问题这题是说:如何放置guard,使得所有想去ET所在房间的客人都必须经过guard所在的房间吧. 而样例中房间5中的客人可以直接到4号房间去的(ET room)而不需要经过3, 不知道答案中的3是怎么得来的?? Followed by:
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