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沙发~1A什么的最爽了

Posted by checkoj at 2012-08-20 23:56:54 on Problem 2616
过了样例就AC了,eps取了1e-8,用了点乘和叉乘。

算法是向量左边的翻倍,右边的和中间的删掉,dfs一下输出结果。莫名其妙就过了。

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