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Can one board be turned into another by moving pieces?

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GoogleCodingLast asked Apr 2026

A board is a string of R, L and empty cells. R pieces can only move right and L pieces only left, one empty cell at a time, and no piece can jump over another. Decide whether a start board can be turned into a target board.

Follow-up: add a wall piece | that never moves and that no piece can cross.

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