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求救，此题与1422有什么区别，为什么1422AC了，这题就通不过呢

Posted by huicpc18 at 2005-10-10 22:56:28 on Problem 2594 
各位大虾有做过1422的的么？
我用的是二分图的匹配做的
也就是最小路径覆盖数＝原图的顶点数－二分图的最大匹配
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