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有个想法

Posted by zqhappyboy7 at 2009-07-21 21:47:34 on Problem 1675
只要任意两个向量夹角绝对值不大于120度,就不可分;只要出现一个夹角绝对值大于120度就可分。

注意的是小数大小判断用a>b+eps。

还有就是单独处理有点在圆心的问题。

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