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NELRU Cache Explained 🔥 The O(1) Trick Every FAANG Interviewer Loves
LRU Cache is one of the most asked system design + coding interview problems.
Many developers try solving it using arrays or queues… but that won't give O(1) operations.
The real trick interviewers expect is combining:
• HashMap for fast lookup
• Doubly Linked List for ordering recently used items
This allows both get() and put() operations in O(1) time.
If you're preparing for product-based companies or FAANG interviews, this concept is a must-know.
Save this reel for your DSA revision and follow for more coding interview tricks 🚀
Comment “CACHE” if you want more system design and DSA interview questions.
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