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Magnets (Double Length) (1065)
Instruction:
The grid is partitioned into regions; each region consists of two dominoes connected on one of their short ends. (A domino is twice as long as wide, or twice as wide as long. Note that only region borders are drawn.) Put "positive" (+) and "negative" (–) symbols into some dominoes, at most one symbol per domino, such that each region either has two symbols or no symbols at all. Dominoes that share an edge or part of an edge (even within a region) cannot contain the same symbol.
The numbers above and to the left of the grid indicate the exact number of symbols of the specified type that must be placed in each column or row, respectively. If a number is not given, there might be any number of symbols of the specified type. A symbol in a domino that spans two columns (or rows) counts as being in both columns (or rows).