08. Best Time to Buy and Sell Stock II – LeetCode 122 📈 Greedy Multi-Trade Strategy

In this episode of the LeetCode Top Interview 150 series, we walk through the optimal solution for Best Time to Buy and Sell Stock II (LeetCode 122) — where multiple transactions are allowed.

We break down a clean, greedy, production-grade strategy: simply sum up all positive price differences between consecutive days for an O(n), O(1) solution. It’s an elegant and efficient way to maximize profit with minimal complexity.

What you’ll learn:
📈 Greedy Summation of Gains — capturing every profitable interval
🧠 O(n) / O(1) time & space complexity — ideal for large-scale streaming/trading data
⚡ Interview-ready readability — clear logic that’s easy to reason about under pressure

Whether you’re gearing up for system-level coding interviews or building scalable throughput-sensitive modules, this pattern gives you production-grade confidence.

More LeetCode 150 walkthroughs coming — stay subscribed and code on!

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