10 lines
244 B
Plaintext
10 lines
244 B
Plaintext
#const n = 20.
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#const k = 5.
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% n-Queens encoding
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{ q(I,1..n) } == 1 :- I = 1..n.
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{ q(1..n,J) } == 1 :- J = 1..n.
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:- { q(D-J,J) } >= 2, D = 2..2*n.
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:- { q(D+J,J) } >= 2, D = 1-n..n-1.
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:- q(X1, Y1), q(X2, Y2), X1 != X2, |X1-X2| + |Y1-Y2| < k. |