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其实这个题问的就是能不能构成多边形，再考虑一些特例就好了！！！

Posted by e_at_fdu at 2005-10-07 15:06:03 on Problem 2640
In Reply To:难道＞３不是输出YES？有反例? Posted by:dearboy at 2005-10-07 13:42:33 
> 晕了...
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