N-queens problem: Difference between revisions
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def solve(size: Int) = (1 until size).foldLeft(seed(size)) (expand(_, size, _))</lang> |
def solve(size: Int) = (1 until size).foldLeft(seed(size)) (expand(_, size, _))</lang> |
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=={{header|SystemVerilog}}== |
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Create a random board configuration, with the 8-queens as a constraint |
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<lang SystemVerilog>program N_queens; |
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parameter SIZE_LOG2 = 3; |
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parameter SIZE = 1 << SIZE_LOG2; |
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`define ABS_DIFF(a,b) (a>b?a-b:b-a) |
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class board; |
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rand bit [SIZE_LOG2-1:0] row[SIZE]; |
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constraint rook_moves { |
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foreach (row[i]) foreach (row[j]) if (i < j) { |
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row[i] != row[j]; |
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} |
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} |
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constraint diagonal_moves { |
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foreach (row[i]) foreach (row[j]) if (i < j) { |
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`ABS_DIFF(row[i], row[j]) != `ABS_DIFF(i,j); |
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} |
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} |
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function void next; |
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randomize; |
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foreach (row[i]) begin |
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automatic bit [SIZE-1:0] x = 1 << row[i]; |
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$display( " %b", x ); |
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end |
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$display("--"); |
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endfunction |
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endclass |
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board b = new; |
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initial repeat(1) b.next; |
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endprogram |
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</lang> |
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=={{header|Tcl}}== |
=={{header|Tcl}}== |
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