Skyscrapers

Skyscrapers example

Rules: Fill the grid with numbers from 1 to n, where n is the grid size (4 in the example), such that no numbers repeat in a row or a column. The grid represents a top-down view of a city, and the numbers in the cells represent skyscrapers: a number gives the height of the skyscraper in its cell. A clue tells how many skyscrapers an observer, standing on the clue, would see in that row/column. Taller skyscrapers block sight to shorter ones.

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