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这里是容易错的地方...必须先判环再判定是否唯一......In Reply To:原来 当拓扑排序不唯一（当然也就不确定）的时候 还要判断是否有环！ nightKnight 2004-09-15 02:38:00.0 Problem 1094 Posted by:Judas at 2006-04-13 22:11:31 rt 膜拜神牛....我也在这个地方调试了好久.... Followed by:
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