Practice Square Coding Question | Real Coding Interviews

Quick Summary

Given grid dimensions and a list of black cell coordinates, identify all 2x2 subgrids that contain each black cell.
For each black cell, compute the valid top-left coordinates of every containing 2x2 block.
Return the results as formatted string pairs within nested lists.

What This Tests

Common Patterns

Direct MappingBoundary ValidationArray Manipulation

Hint 1

Hint 2

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