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Re:不明白

Posted by CO2 at 2006-10-21 14:54:42
In Reply To:不明白 Posted by:Mithril at 2006-10-21 14:51:14 
> 那么1-2-3-4也是一个圈，1->4也是唯一的？

是不是唯一要看您找到的其他人的路径，是否存在1->4
边是无向边
1-2-3-4-1在样例里是一个圈
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