Two Sum - LeetCode #1 (HashMap Trick Explained in less than 4 min)

Crack LeetCode #1 — Two Sum — using the optimal O(n) HashMap approach that shows up in FAANG interviews. Most solutions online skip the why. This one doesn't.

🔗 LeetCode problem → https://leetcode.com/problems/two-sum

If you're grinding NeetCode 150 or Blind 75, Two Sum is problem #1 for a reason — it introduces the complement + hashmap pattern you'll see again in 3Sum, 4Sum, and beyond.

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