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贪心题。。附代码

Posted by yzhw at 2009-03-15 01:47:26 on Problem 1066 
枚举最上下左右四条边的中点，然后计算从目标点到这些中点的线段与其他线段的交叉数N，N+1就是答案。。就不证明了吧~~~~
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