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Stroll among skyscrapers (668)
Instruction:
Place numbers from 1-5 (1-4 in the example) in all the empty cells so that they do not repeat in rows and columns (do not consider the numbers in grey cells). The numbers in white cells represent skyscrapers. The numbers in the grey cells indicate the number of visible skyscrapers in the direction of the arrow (the grey cells themselves are of zero height).The building is visible only when it is higher than all the buildings in front of it.