olymmath

KöMaL 2020 A767

    In an n×nn\times n array all the fields are colored with a different color. In one move one can choose a row, move all the fields one place to the right, and move the last field (from the right) to the leftmost field of the row; or one can choose a column, move all the fields one place downwards, and move the field at the bottom of the column to the top field of the same column. For what values of nn is it possible to reach any arrangement of the nn fields using these kinds of steps?

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