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Grokking the Coding Interview Patterns in Go

Solution: Number of Spaces Cleaning Robot Cleaned

Understand how a cleaning robot moves within a 2D binary matrix, navigating obstacles and changing direction when needed. Learn to track visited cells by direction using in-place bitwise marking to efficiently count uniquely cleaned spaces. Explore the algorithm and its time and space complexity.

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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 ...