Web Reference: If the number of keys exceeds the capacity from this operation, evict the least recently used key. The functions get and put must each run in O (1) average time complexity. In-depth solution and explanation for LeetCode 146. LRU Cache in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions. We can use a doubly linked list where key-value pairs are stored as nodes, with the least recently used (LRU) node at the head and the most recently used (MRU) node at the tail. Whenever a key is accessed using get () or put (), we remove the corresponding node and reinsert it at the tail.
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