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如果输入数据是空的，你应该输出Impossible

Posted by xfxyjwf at 2008-01-04 08:53:21 on Problem 2513
In Reply To:Keep WAing,my god! Posted by:andy_lee at 2008-01-04 00:54:42 
这样的数据很恶心，我觉得不应该出现……
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