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Re:这是一棵树?

Posted by angeldust at 2012-08-25 19:33:10 on Problem 1986
In Reply To:这是一棵树? Posted by:hkrcn at 2010-03-16 18:58:33
> 请问1984那道题哪里说明这是一棵树呢? 英文差好长看不懂-.-
precisely one path (sequence of roads) links every pair of farms

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