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Skyscrapers (With Blanks, Distinct Diagonals) (1217)
Instruction:
Place a number from 1 to X-1 into some cells so that each number appears exactly once in each row and column. (X is the number of cells in each row.) Each number represents a skyscraper of its respective height. The numbers outside the grid indicate how many skyscrapers can be seen in the respective row or column from the respective direction; shorter skyscrapers are hidden behind taller ones. Some numbers may already be filled in for you.
Also, each number must appear exactly once in each main diagonal. Note that there will be an empty cell in each row, column, and main diagonal.