LeetCode 1582 Special Positions in a Binary Matrix | Matrix Traversal + Row Column Count

In this video, we solve LeetCode 1582: Special Positions in a Binary Matrix using Python. This is an easy matrix problem, but it teaches a very important DSA idea: instead of checking the same row and column again and again, we can first count the number of 1s in every row and every column. Then a position (i, j) is special only when: mat[i][j] == 1 row_count[i] == 1 col_count[j] == 1 In this video, we cover: Understanding the problem statement What makes a position special Brute force approach Optimized row-count and column-count approach Python solution Dry run with example Time and space complexity Common beginner mistakes This problem is great for beginners who are learning matrix traversal, 2D indexing, and precomputation.