LeetCode 304 | Range Sum Query 2D – Immutable

In this problem, we solve LeetCode 304 – Range Sum Query 2D – Immutable, a classic Prefix Sum problem that extends the one-dimensional range sum concept to matrices. We learn how to preprocess a 2D grid so that multiple submatrix sum queries can be answered efficiently in constant time, making it a powerful technique for matrix-based problems. 💡 In this video: -Understanding the Problem Statement -Why Brute Force is Inefficient -Introduction to 2D Prefix Sums -Building the Prefix Sum Matrix -Submatrix Sum Calculation Formula -Handling Matrix Boundaries -Optimizing Multiple Queries -Step-by-Step Dry Run -Time & Space Complexity Analysis -Java Implementation 🎯 This problem is an excellent introduction to 2D Prefix Sums and helps build the foundation for advanced matrix, dynamic programming, and range query problems frequently asked in coding interviews. 📌 Follow & Connect with Us: 🌐 Website: leetverse.vercel.app 📝 Registration link : https://forms.gle/QkGwatVBXDr6dpxi6 📸 Instagram:   / leetverse   ✨ LeetVerse — Learn, Code, Grow! #LeetCode #DSA #RangeSumQuery2D #PrefixSum #Matrices #Java #CodingInterview #ProblemSolving #LeetVerse #Algorithms #2DPrefixSum