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1->2 2->3 4->2 2->5的结果应该是2吧？但是用PKU的分析应该是3！

Posted by animate at 2005-08-28 17:31:28 on Problem 2594
In Reply To:这道题目，如果我没理解错的话，是不是就是最小路径覆盖？并且给定的是严格的有向无环图？还是我理解有误？ Posted by:Bluebird at 2005-08-28 15:57:37 
我想应该是用二分图做的，但是二分图的构造不是这么简单的。
我猜：左边是n个点，右边是n+m个点。
一个点k的入度为mk，那么点k在右边出现mk次。
我瞎猜的－－||
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