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Simulate dropping each ball from the top of each column through an m×n grid of 1/-1 diagonal boards that steer it right/left; for each ball determine which bottom column it exits or -1 if it gets stuck by hitting a wall or encountering a V-shaped pair of opposing boards. Return an array of these results for all n balls.
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Leetcode 1706. Where Will the Ball Fall
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Source snapshot: Nov 12, 2026
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