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A pair of intersection points might be connected by more than one trail.！！！！！！！！！！！！！！！！！

Posted by gfedcba at 2009-03-06 16:44:30 on Problem 3272 and last updated at 2009-03-06 16:45:33 
做题之前没有看到这一句，结果做了半天吃了无数只WA，怪我自己呀！！！！在此感hao2给我的代码。
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