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无解的时候是输出 -1 还是 ?-1? ???

Posted by ArXoR at 2005-01-13 12:39:18 on Problem 1328
In Reply To:这题输出格式到底是什么啊? Posted by:ArXoR at 2005-01-13 12:38:19
每个输出是否要隔一行?

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