If an existing item is queried how does an LRU implementation rapidly move it to the front

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Anonymous · Accepted Answer

An LRU cache achieves this by combining a Hash Map with a Doubly Linked List:

1. Hash Map Lookups: The hash map stores the key and its corresponding node
    address, allowing O(1) access time to find the item.

2. Doubly Linked List Manipulation: Because nodes contain direct pointers to
    their prev and next neighbors, the implementation can unlink the accessed
    node from its current position and re-insert it at the head (front) in O(1)
    time, avoiding any costly traversal.

If an existing item is queried how does an LRU implementation rapidly move it to the front

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