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小样儿,终于把你征服,哈哈。给用拓扑排序的同学一点提示吧

Posted by TurnAround at 2009-12-29 23:01:34 on Problem 1094
WA的晕头转向,终于过了。。哈哈
和我一样用拓扑排序WA的同学们一点提示:
开始我用《算法导论》里的拓扑排序过程来做的,后来发现拓扑排完确定没有环后,不知道怎么判断是“有序”还是“不确定”。后来用严蔚敏老师的《数据结构》里的拓扑排序过程,只要中间有一次入度为空的队列里的个数超过一个,那么就不会是“有序”的了。当然《算法导论》的拓扑过程可能也是能做的,只是我没理解透,期待大牛的讲解。

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