Test Queens

Jan Burse, created Jun 10. 2019
* CLP(B) test queens via CLP(FD) encoding.
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:- current_prolog_flag(dialect, jekejeke) -> true
; use_module(library(clpb)).
:- current_prolog_flag(dialect, jekejeke)
-> use_module(library(finite/clpb)); true.
:- current_prolog_flag(dialect, jekejeke)
-> use_module(library(basic/lists)); true.
:- ensure_loaded('../mukai/finsat.p').
% queens(-Binaries)
queens(7, X),
% queens(+Integer, -List)
queens(N, X) :-
length(X, N),
X ins 1..N,
% noattack_list(+List)
noattack_from(Y, X, 1),
% noattack_from(+List, +Variable, +Integer)
noattack_from([], _, _).
noattack_from([Y|Z], X, N) :-
X+N #\= Y,
Y+N #\= X,
M is N+1,
noattack_from(Z, X, M).