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鸡过留声——圆的离散化

Posted by HeadacherMM at 2010-01-16 23:41:50 on Problem 1418 and last updated at 2010-01-16 23:44:34 
若干圆相交，每段小圆弧或被完全覆盖，或者完全可见，枚举小圆弧，那么其最上面的圆盘是可以看到的。枚举圆弧时可以以圆弧上的一点代替一整段圆弧，此点最上面的圆盘可见。
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