Hash Tables From Scratch - Search Videos

Solving Two Sum With a Hash Table I Built From Scratch [Problem Solving With Python]

YouTubeMahmoud Ahmed

Solving Two Sum With a Hash Table I Built From Scratch [Problem Solving With Python]

Two Sum is the classic interview problem. The brute-force solution is O(n²). Swap the inner loop for a hash table lookup and you get O(n) — same correctness, dramatically faster. I walk through both versions using a hash table I implemented from scratch.

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