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CODay 20/200: How HashMap Works Internally
HashMap is one of the most powerful data structures in coding interviews & real-world systems. Here’s how it works under the hood:
✅ Hashing: Key → Hash function → Index in array (bucket).
✅ Collision handling: Chaining (LinkedList/Tree in Java) or Open addressing.
✅ Time complexity: O(1) average for put/get, O(n) worst-case.
⚡ Mastering HashMap internals is a must for interviews — it shows depth, not just coding ability.
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