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你并不知道闭合的环从第几个节点开始,a如果不动,它可能不在闭合环中,b永远到不了a。例如:1->2->3->4->5->3...的链表中,a为1,b却永远在3->4->5->3->4->5....中转圈。

xxjjs (东方射日)
(#144410@0)
2001-7-25 -04:00
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