The given numbers tell you the sum of the heights of the skyscrapers you can see from that side of the row or column. e.g. The row 2-0-4-1-3 has a sum of 6 seen from left to right and a sum of 7 seen from right to left. Every height (all used heights are given next to the puzzles. e.g. 1~4. Sometimes cells remain empty.) appears exactly once in every row and column.
1~4
1~5
1~4
1~6
1~5 1~4
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