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多谢指点，想怎样构图都快想疯了。

Posted by threetree at 2008-09-09 11:08:18 on Problem 3041
In Reply To:这题用最小割原理会好理解一些 Posted by:jlthero at 2008-08-09 11:20:54 
有了这个思路，最小点覆盖很好理解了
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