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可以用向量叉乘判断三点是否判断共线, 相比用斜率来得简单。 每组数据完后, 忘了清max的值, wa了几次

Posted by only_xxp at 2011-10-12 16:05:55 on Problem 1118 and last updated at 2011-10-12 16:06:48


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