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Notice the coordinates are real numbers. And the coordinates you output must be exactly the same as the point in the input.

Posted by contest_clarificator at 2007-08-25 11:05:29 on Problem 3355
In Reply To:Why??? Posted by:Etrnls at 2007-08-25 10:07:36 
that means if one point on the convex hull is (0.000,0.000) in the input, you may not output (0,0) or (0.00,0.00).
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