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Re:那答案为什么是3。。。

Posted by CO2 at 2006-10-21 14:58:55
In Reply To:那答案为什么是3。。。 Posted by:Mithril at 2006-10-21 14:56:31 
因为可以找到符合要求的3个圈
比如
1->2->3->1   
1->4->3->1   
1->2->4->1   

其中
2->3
4->3
2->4
分别是每个圈里唯一的（所有其他路径都不存在这条边）
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