LeetCode | Number of Submatrices with Equal X and Y | LeetCode Daily | Prefix Sum Trick 🔥 скачать в хорошем качестве

LeetCode | Number of Submatrices with Equal X and Y | LeetCode Daily | Prefix Sum Trick 🔥

In this video, we solve the problem "Number of Submatrices with Equal X and Y" using an efficient Prefix Sum approach. The key idea is to treat 'X' as +1 and 'Y' as -1, and build a 2D prefix sum matrix to quickly calculate the balance in any submatrix. Additionally, we track whether at least one 'X' exists to ensure valid submatrices. By combining prefix sums with smart conditions, we can count valid submatrices in optimal time without brute force. 🚀 This approach helps reduce complexity and is a great example of applying prefix sums in 2D grids. ⏱️ Time Complexity: O(n × m) 📦 Space Complexity: O(n × m) 🔗 Problem Link: (Add your LeetCode link here) 💻 Languages Covered: Java | Python | C++ 👍 Don’t forget to Like, Share & Subscribe for more DSA content! #leetcode #dsa #codinginterview #prefixsum #2darray #algorithms