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算法很简单呀!

Posted by JiangLY at 2005-04-23 23:33:25 on Problem 2419
In Reply To:帮忙看一下是怎么回事老是WA？ Posted by:dxm at 2005-04-23 23:30:18 
把每个人听到的树放在各自的集合里，再两两比较一下就行了
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