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Initial data commit

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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 72d218235f
commit f23f22d71c
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Task/N-queens-problem/Prolog/n-queens-problem-4.pro Normal file
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:- initialization(main).
queens(N,Qs) :- bagof(X, between(1,N,X), Xs), place(Xs,[],Qs).
place(Xs,Qs,Res) :-
Xs = [] -> Res = Qs
; select(Q,Xs,Ys), not_diag(Q,Qs,1), place(Ys,[Q|Qs],Res)
.
not_diag(_, [] , _).
not_diag(Q, [Qh|Qs], D) :-
abs(Q - Qh) =\= D, D1 is D + 1, not_diag(Q,Qs,D1).
main :- findall(Qs, (queens(8,Qs), write(Qs), nl), _), halt.