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LeetCode #3719 Explained | Longest Balanced Subarray I | Prefix Sum + HashMap In this video, we solve LeetCode Problem #3719 – Longest Balanced Subarray I, an important array and prefix sum problem frequently asked in coding interviews. The goal is to find the length of the longest balanced subarray, where the count of distinct even numbers equals the count of distinct odd numbers. The solution is explained step by step using an efficient Prefix Sum + HashMap approach, making it easy to understand and implement. Problem Overview You are given an integer array A subarray is called balanced if: Number of distinct even elements = number of distinct odd elements Return the maximum length of such a subarray Approach Explained Convert the problem into a prefix difference problem Track the balance between even and odd elements Use a HashMap to store first occurrences Update the maximum length whenever the balance repeats This approach runs efficiently in O(n) time. What You Will Learn How to identify balanced subarrays Applying prefix sum techniques Using HashMap for optimized lookup Writing interview-ready array solutions Time and space complexity analysis 📄 PDF Notes & 💻 Code Resources Access PDF notes and full code explanations here: 👉 https://github-website-ochre.vercel.app/ 💻 DSA & LeetCode Playlist Complete DSA playlist with explanations and animations: 👉 https://github.com/sannikumar85/DSA_P... 👨‍💻 Connect With Me LinkedIn Profile: 👉   / sanni-kumar-gupta-10792b290   👍 Support the Channel Like the video if it helped you Comment your approach or doubts Subscribe for more LeetCode + DSA explanations 🔖 Hashtags (Use at end) #LeetCode #LeetCode3719 #PrefixSum #HashMap #DSA #CodingInterview