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Maximal Rectangle is a hard coding interview question covering arrays, stack, dynamic programming — the kind asked at FAANG (Facebook/Meta, Apple, Amazon, Netflix, Google) and AI-first companies like Anthropic, OpenAI, and Nvidia.
Given a rows x cols binary matrix, find the largest rectangle containing only 1's and return its area.
Example: matrix = [["1","0","1","0"], ["1","0","1","1"], ["1","1","1","1"], ["1","0","0","1"]] -> 6
Builds on the "Largest Rectangle in Histogram" problem.
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