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请问一下如果是这样的情况答案是多少

Posted by WeikaiZeng at 2012-08-05 11:02:03 on Problem 1422
5个点 4条路
1->2  2->5 2->3 4->2
也就是
   4
   |
1->2->5
   |
   3
答案应为3是吗?

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