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Grokking the Coding Interview Patterns

Solution: Number of Spaces Cleaning Robot Cleaned

Explore how to simulate a robot's cleaning path in a 2D binary matrix by modeling its movement rules and stopping conditions. Understand how to track visited states using bitwise operations and optimize the solution with in-place grid modifications to calculate the total cleaned spaces efficiently.

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Statement

You are given a 0-indexed 2D binary matrix, room, representing a room of size m×nm \times n. In this matrix, 00 represents an empty space, while 11 represents a space occupied by an object. The top-left corner of the room is always empty ...