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AC的朋友可以玩玩这题http://acm.fafu.edu.cn/showproblem?problem_id=1004

Posted by 10226001 at 2011-08-20 16:49:19 on Problem 2389
http://acm.fafu.edu.cn/showproblem?problem_id=1004
这题相对会难一点。

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