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水题

Posted by 20071002871 at 2009-08-01 19:14:56 on Problem 2890 and last updated at 2009-08-01 19:15:47
晕死,没想到N*M的复杂度+vector都能125MS水过,我还想了N久,觉得一定有好方法,哎,有优秀方法请告知。。。。,谢谢。。。

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