DIY: Maximal Rectangle

Solve the interview question "Maximal Rectangle" in this lesson.

We'll cover the following

Problem statement

Given an m x n binary matrix containing 0's and 1's. Find the largest rectangle containing only 1's and return its area.

The input will be an m x n matrix of 0's and 1's. The following is an example input:

[["1","0","1","0","0"],["1","0","1","1","1"],["1","1","1","1","1"],["1","0","0","1","0"]]

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