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就是第一个碰到的

Posted by T1 at 2005-03-11 22:12:51 on Problem 2277
In Reply To:牛！那他肯定能过的，"TO be violated"怎么理解，太抽象了 Posted by:congcong at 2005-03-11 22:10:31 
对于每个点，先判断是不是出界了
再判断是不是和前面某个相交了（按顺序）

等所有的点都算完了，看看是不是闭合的
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