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Doppelblock Skyscrapers (908)
Instruction:
Place either a block or a number from 1 to X (integers only) into each cell so that each number appears exactly once in each row and each column. (X is two fewer than the number of cells in each row.) Each row and each column will therefore have exactly two cells with blocks in them.
Each number represents a skyscraper of its respective height. The numbers outside the grid indicate how many skyscrapers between the two blocks can be seen from the first block in the respective row or column from the respective direction; smaller skyscrapers are hidden behind higher ones. (Skyscrapers not between the two blocks are not seen.) Some numbers may already be filled in for you.