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refer to any books on graph theory and that will gain you some understanding.

Posted by frkstyc at 2007-03-06 16:33:40 on Problem 3204
In Reply To:if all roads are directed,it can be have circle. Posted by:lzpsky at 2007-03-06 16:18:26
> 这问题到底有向还是无向?!

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