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Explanation

See how an LRU Cache achieves O(1) get and put using a doubly-linked list + hashmap — the same design used in Redis and CPU cache controllers.

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-- / --
Cache empty (capacity = 3)
Order List (head = MRU ◀──── tail = LRU)
HashMap key → node
Key
Value
{ }
-- / --
Cache empty (capacity = 3)
Order List (head = MRU ◀──── tail = LRU)
HashMap key → node
Key
Value
{ }

Explanation

Step through to reveal explanations.