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Given a plank of length n and arrays of ant positions moving left or right, compute when the last ant falls off. Key insight: collisions simply swap identities, so treat ants as passing through and return the maximum time any ant needs to reach an edge (distance to nearest end in its moving direction).
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Leetcode 1503. Last Moment Before All Ants Fall Out of a Plank
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Source snapshot: Nov 12, 2026
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