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Grokking the Coding Interview Patterns in Python

Where Will the Ball Fall

Explore how to simulate balls dropping through a 2D grid where each cell directs the ball left or right. Learn to determine the exit point for each ball or if it gets stuck, understanding key matrix traversal and redirection logic to solve this problem efficiently.

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Statement

You have nn balls and a 2D grid of size m×nm \times n representing a box. The box is open on the top and bottom sides. Each cell in the box has a diagonal that can redirect a ball to the right or the left. You must drop nn balls at each column’s top. The goal is to determine whether each ball will fall out of the bottom or become stuck in the box. Each cell in the grid has a value of 11 ...