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Two Sum: STOP Using Hash Maps! ❌ (O(n) Two-Pointer Trick)

YouTubeFlashDsa

Two Sum: STOP Using Hash Maps! ❌ (O(n) Two-Pointer Trick)

Everyone solves LeetCode 1 (Two Sum) using a Hash Map. But what if the array is already sorted? 🤔 In this video, we cover the Two-Pointer technique to solve Two Sum in O(n) Time and a blazing-fast O(1) Space—meaning zero extra memory needed! 🚀 How it works: 1. Put one pointer at the start, one at the end. 2. Add them up. 3. If the sum ...

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