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YouTubeLindorCodes
LeetCode #1 Two Sum: Why the HashMap Solution Actually Works
The #1 most asked LeetCode problem — and most people memorize the answer without understanding why it works. The key insight is simple algebra: if X + Y = target, then X = target − Y. At every step, you check if the complement already exists in your HashMap — if it does, you're done. If not, you store the current value and its index and ...
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