Web Reference: Mar 24, 2026 · The basic idea behind implementing an LRU (Least Recently Used) cache using a key-value pair approach is to manage element access and removal efficiently through a combination of a doubly linked list and a hash map. Oct 10, 2024 · Today, I implement a Least Recently Used (LRU) cache. In this blog I will demonstrate the concepts, first approach without concern for time complexity, second approach the optimizes time complexity, and the final approach which fixes the shortcoming of earlier approaches. Unlike systems that model real-world concepts (such as users, products, or bookings), the design of an LRU Cache is centered around choosing the right data structures and internal abstractions to achieve the required functionality and performance.
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