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LeetCode 121 Explained Mathematically | Best Time to Buy and Sell Stock | O(n) Proof
Most people solve LeetCode 121 by memorizing the solution. In this video, we prove *why* the one-pass approach is correct using the min-tracking invariant — so you can derive it yourself in any interview. WHAT YOU'LL LEARN: Why tracking the minimum so far is mathematically sufficient How to prove greedy correctness using invariants How to ...
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