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关于链表remove 时间复制度问题 #20

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@liyuanzhou92

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@liyuanzhou92

你好,
对于链表remove时间复杂度有些疑问
我认为无论是单链表、双链表,删除一个元素的时间复杂度都是O(n),因为都需要遍历整个链表;
删除一个node时间复杂度都是O(1),因为都只需要将前后两个node相连,
为什么lru_cache 不用单链表要用双链表呢?

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