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童鞋们,,真的有不连通 要输出0

Posted by chenkan at 2011-10-07 00:21:45 on Problem 1679
RT。。   wa了n次T.T    有不连通的情况要输出0   再次提醒后人。。   说没有不连通的是人品好,,不连通情况程序跑出来正好是0。。

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