Doppelblock: Shade two cells in each row and column, and fill the remaining cells with digits 1-4 so that each row and column contains each digit exactly once. Numbers outside the grid indicate the sum of the numbers that are between the two shaded cells in the corresponding row or column.
No cell must be the same in both solutions.
Solution code: The diagonal from top left to bottom right, '-' for shaded cells. Start with the solution whose code is lexicographically smaller.
on 6. April 2023, 23:53 by hopppe
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