Master Prefix Sum 🚀 (Theory + LeetCode 724: Find Pivot Index) | Part 1

🚀 Welcome to Part 1 of our ultimate Prefix Sum series! If you want to optimize your subarray-related problems from O(N²) to O(N) time complexity, this is the only video you need to watch. In this video, we deep dive into the core theory behind Prefix Sums, break down the common patterns you'll encounter in coding interviews, and walk through a complete, optimized solution for LeetCode 724 (Find Pivot Index). 🔥 What we cover in this video: ✅ The Core Intuition: What is a Prefix Sum and why do we use it? ✅ Key Patterns: Recognizing when to apply Prefix Sums in DSA problems. ✅ Dry Run & Code: Step-by-step walkthrough of LeetCode 724 (Find Pivot Index). ✅ What's Next: A sneak peek into Part 2 #dsa #prefixsum #leetcode #codinginterview #datastructures #algorithms #placementpreparation #java #cplusplus #softwareengineer