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总是超时，思路有问题？

Posted by gths123 at 2009-07-18 11:14:52 on Problem 1009 
我的思路就是把行多的拿出来，中间的部分设为零，然后边缘部分单独处理。
处理的时候每个像素算周围的8个像素的差，这样的应该是 O(8n).这样会超时吗？
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