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Re:这题为什么是求出凸包,然后判断凸包上每条边存在3个以上点,就可以了。看不懂题目,求大牛解答????????

Posted by zhanyu at 2011-07-25 12:36:50 on Problem 1228
In Reply To:这题为什么是求出凸包,然后判断凸包上每条边存在3个以上点,就可以了。看不懂题目,求大牛解答???????? Posted by:zhouzhaohello at 2011-07-19 11:33:45
我的理解是:
如果某条边上没有3个点,那就可以再添加一个点形成新的凸包。
如果都存在3个点,那么再加一点形成的多边形就是凹的了吧。
题目中的点都要用上。

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