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LeetCode 85 | Maximal Rectangle Solution | Stack | Hard Problem | MAANG Preparation

Welcome to Pen & Paper!

In this video, we tackle *LeetCode 85: Maximal Rectangle**, where we find the largest rectangle comprised entirely of '1's in a 2D binary matrix. See how we transform each row into a histogram and leverage the **monotonic stack* technique (also used in Largest Rectangle in Histogram) to achieve an efficient, step-by-step solution.

What you'll learn:
• Problem overview & constraints
• DP histogram-building across rows
• Largest Rectangle in Histogram using a stack
• Full Python (and adaptable Java/C++) implementation
• Time & space complexity (O(m × n), O(n) space)
• Edge case considerations: empty matrix, single cell, all zeros

For detailed write-ups, code files, and resources, visit *penpaperpreparation.com*

If this helps you master dynamic programming and stack techniques, don’t forget to *like, comment, and subscribe* for more LeetCode deep dives by **Pen & Paper**. Happy coding!

— Pen & Paper (penpaperpreparation.com)