11 lines
302 B
Prolog
11 lines
302 B
Prolog
% John Devou: 26-Nov-2021
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% Short solution to use on https://swish.swi-prolog.org/.
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% Works fast for n ≤ 17.
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:- use_rendering(chess).
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q(_,0,[],[]).
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q(N,R,[(R,C)|Qs],[C|Cs]):- R > 0, S is R-1, q(N,S,Qs,Cs), between(1,N,C),
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not((member((U,V),Qs), (V =:= C; R-U =:= abs(C-V)))).
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q(N,X):- q(N,N,_,X).
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