row_ops=[1, 2, 2] col_ops=[0, 0, 1]
op=Operation(is_row=True, index=0, color=0), col_ops[i]=0
op=Operation(is_row=True, index=1, color=1), col_ops[i]=0
op=Operation(is_row=False, index=2, color=3), row_ops[i]=2
4 4 0 1