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链表中环的入口节点 #105

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AwesomeDevin opened this issue Sep 26, 2023 · 0 comments

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AwesomeDevin commented Sep 26, 2023 •

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给定一个链表，若其中包含环，请找出该链表的环的入口节点，否则，输出null。

解析：
基于hashmap进行标记，如果标记过了，则为入口节点，如果遍历到最后仍没有出现过标记过的，输出null

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