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终于搞懂了！

Posted by shixinfei at 2010-08-24 19:57:24 on Problem 3020 
终于搞懂了，答案为N-|Match|/2， 注意就是因为无向图转化成无向二分图的时候多加了一些边，所以才使得Match变成了2倍，而普通的有向图和转化成的二分图的匹配数目是一样多的。
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