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听说是福州区域赛的一道题啊。

Posted by yygy at 2013-09-16 15:46:44 on Problem 3986
In Reply To:Re:怎么做啊? Posted by:tasty at 2013-09-16 14:52:21
> http://hi.baidu.com/billdu/item/c749952ab2ab50c2ef10f137

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