Author: 红葉 (MOMIJI), from China, this question comes from his personal blog.
According to the following rules, place the black "triangles forming a square" in the grid.
1. You can place four kinds of black triangles in the square.
2. You cannot place black triangles in black squares.
3. The part of the grid that is still white (not covered by black triangles) always forms a rectangle or square.
4. The numbers indicate how many black triangles there are around vertically and horizontally.
Nikoli linkfor an example.
Solution code: For each row from top to bottom enter the number of triangles.
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