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Inside Skyscrapers (79)
Instruction:
Place a digit from 1 to N, in an NxN grid, into each of the empty cells so that each digit appears exactly once in each row and column. Each digit inside the grid represents the height of the skyscraper in that cell. The clues on the edges between some cells indicate the number of skyscrapers visible in corresponding row or column from that point. Taller skyscrapers hide shorter ones.