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Why Prefix Sum Beats Sliding Window | Longest Subarray Sum = K
In this video, we deeply and step-by-step solve one of the most important interview problems: Longest Subarray with Sum = K You’ll learn: Why brute force and sliding window fail The prefix sum + hash map pattern Why we store the earliest index only A mathematical proof (not hand-waving) A full dry-run walkthrough like a debugger Interview ...
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