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你俩都有错,都在一个比较小的case就输出impossible了,而这个case是可以的

Posted by hawk at 2004-11-21 21:58:08 on Problem 2090
In Reply To:那么我应该没错啊……奇怪的WA…… Posted by:xreborner at 2004-11-21 21:46:58


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