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假如是一个沙漏那样的形状呢？

Posted by frkstyc at 2005-06-30 19:47:59 on Problem 2401
In Reply To:Re:在想了，不过还没有成熟的想法 Posted by:Ikki at 2005-06-30 19:44:48 
> 可不可以直接枚举顶点然后判visible？
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