A 2D list stores a grid as a list of rows. cells[r][c] names a cell, row first. Nested loops walk the grid row by row, and in_bounds and is_open keep every look inside the field.
16 blocks · 4 graded
20 blocks · 5 graded
25 blocks · 4 graded
23 blocks · 3 graded
18 blocks · 3 graded
8 blocks · 1 graded
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