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就是说对于每一个不属于S的人,S里都有一些人和他不是朋友,就是说S是个极大团

Posted by 20053565 at 2008-09-08 22:19:55 on Problem 2989
In Reply To:please help my poor english Posted by:zfy0701 at 2008-09-01 19:25:25


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