Leetcode 3178. Find the Child Who Has the Ball After K Seconds

Children in a line pass a ball one step per second, reversing direction whenever it reaches either end; determine which child holds the ball after k seconds. Exploit the periodicity 2*(n-1) to reduce k and mirror (reflect) the position past the right end to get the final index.

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Leetcode 3178. Find the Child Who Has the Ball After K Seconds

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