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Yajinurikabelin (343)
Instruction:
Blacken some white cells and then raw a single closed loop (without intersections or crossings) through all remaining white cells. Loop paths must be orthogonal.
Some cells are in black and cannot be part of the loop. Numbers in such cells must be in a black region that has the same area in cells as that number; cells of the same color are considered in the same region if they are adjacent along edges. No black region may contain more than one numbered cell (although it is possible for a black region to not contain any numbered cells at all).
Some cells are outlined and in gray; they are neither white nor black, and therefore are not part of the loop or part of any black region. Numbered arrows in such cells indicate the total number of blackened cells (possibly including given black cells) along the direction of the arrow, starting in the arrowed cell and going along a row or column to the edge of the grid.