Web Reference: In-depth solution and explanation for LeetCode 73. Set Matrix Zeroes in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions. If any cell of the matrix has a zero we can record its row and column number using additional memory. But if you don't want to use extra memory then you can manipulate the array instead. i.e. simulating exactly what the question says. We can use the topmost row and leftmost column of the matrix as boolean arrays by marking 0 instead of true. However, since they overlap at one cell, we use a single variable to track the top row separately. We then iterate through the matrix and mark zeros accordingly.
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