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Re:这题什么意思？

Posted by jesstu at 2010-09-15 20:25:57 on Problem 1097
In Reply To:这题什么意思？ Posted by:mdj at 2008-08-20 16:46:47 
> 看了半天没看懂。
> City X is put on the sign if the sign is on a road such that the shortest path from the intersection immediately preceding the sign to X uses the road.
> 
> 这句话什么意思？？？
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