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AC了

Posted by wxh_8989 at 2010-08-18 13:51:03 on Problem 2826
找出交点P
统计4个点有多少个比p点高,要有两个点a和b才行,比较矮的那个交点a向上的垂直射线是否与高的那点b  与  p的线段有交点,没有就用叉积求面积。

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