Saturday, 1 February 2014

17- Skyscrapers


(Published in Czech Republic Academic Championship)

Write a single number from 1 to 9 in each cell such that each number appears exactly once in every row, column and bolded 3x3 box. The numbers outside the grid means how many skyscrapers are seen from that direction of particular row or column (higher skyscrapers cover lower ones behind them).

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