Use a hash map for O(1) lookup and a doubly-linked list to track recency.
key -> node.get/put, move the node to most-recent position. On capacity overflow, evict from the left.The list maintains exact LRU order; the map provides O(1) access to nodes.
Use a hash map for O(1) lookup and a doubly-linked list to track recency.
key -> node.get/put, move the node to most-recent position. On capacity overflow, evict from the left.The list maintains exact LRU order; the map provides O(1) access to nodes.