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Ingy döt Net 2013-04-10 23:57:08 -07:00
parent 47bf37c096
commit b83f433714
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Task/N-queens-problem/Prolog/n-queens-problem-3.pro Normal file
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solution(Ylist) :-
sol(Ylist,[1,2,3,4,5,6,7,8],
[1,2,3,4,5,6,7,8],
[-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7],
[2,3,4,5,6,7,8,9,10,11,12,13,14,15,16]).
sol([],[],[],Du,Dv).
sol([Y|Ylist],[X|Dx1],Dy,Du,Dv) :-
del(Y,Dy,Dy1),
U is X-Y,
del(U,Du,Du1),
V is X+Y,
del(V,Dv,Dv1),
sol(Ylist,Dx1, Dy1,Du1,Dv1).
del(Item,[Item|List],List).
del(Item,[First|List],[First|List1]) :-
del(Item,List,List1).