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晕，这题的路有说是双向的么？

Posted by 200730690105 at 2010-01-04 00:16:27 on Problem 1797 
The following m lines contain triples of integers specifying start and end crossing of the street and the maximum allowed weight
我觉得这句应该是暗示单向啊，是我看漏了还是说这个是“常识”？
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