LeetCode #689: Maximum Sum of 3 Non-Overlapping Subarrays in Java | Prefix Sums & Sliding Window!

Quack open LeetCode 689 with Algo Ducky! In this video, we dive into the problem of finding the maximum sum of 3 non-overlapping subarrays using Java. From a brute-force triple loop to prefix sum optimizations and a clever sliding window strategy, we break down each step to help you understand not just how, but *why* it works. This one’s a real-world gem for systems dealing with windowed analytics, telemetry, and performance monitoring. Don’t miss the final solution—it’s Big O of n and interview-ready!

We cover:
- Brute force approach with window sum caching
- Prefix sum-based optimization
- Sliding window with precomputed max indices

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Chapters:
0:00 Introduction
0:30 Brute Force with Precomputed Window Sums
2:29 Dynamic Programming with Prefix Sums
4:22 Sliding Window with Greedy State Tracking
6:18 Summary