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Hash Tables

O(1)-average keyed lookup by mapping keys to array slots: collisions, load factor, and why open addressing into a fixed array beats chaining when you have no heap.

25 min read

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5 interview questions on this topic

Each one opens a full worked answer.

How does a hash table achieve O(1) average lookup?What is a collision and how do you resolve it?Why does embedded code usually prefer open addressing over chaining?What is the load factor and why does it matter?When is a hash table the wrong choice?

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