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这题怎么样才表示一个CASE已经结束, 还是输入总共才只有一个CASE?

Posted by hz02ruc at 2004-07-13 18:26:23 on Problem 1130
In Reply To:请教大牛牛们一个问题 Posted by:hz02ruc at 2004-07-13 16:51:39 
> 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??
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