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小弟英语不好，哪位能告诉我这题具体是什么意思！！

Posted by hust_acm at 2004-10-12 20:01:40 on Problem 1737 
尤其是这句看不懂！An undirected graph is connected if and only if for every pair (u,v) of vertices,u is reachable from v.
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