A binary matrix marks a shape with 1s. From a start cell inside it, how do you set every cell of the shape to 0, and how would you do it with multiple threads?
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A binary matrix draws a duck: cells inside the duck are 1 and cells outside are 0. Given a start cell inside the duck, how do you set every cell of the duck to 0? How would you write this so it runs with multiple threads?
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