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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Binary-search/Prolog/binary-search.pro Normal file
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bin_search(Elt,List,Result):-
length(List,N), bin_search_inner(Elt,List,1,N,Result).
bin_search_inner(Elt,List,J,J,J):-
nth(J,List,Elt).
bin_search_inner(Elt,List,Begin,End,Mid):-
Begin < End,
Mid is (Begin+End) div 2,
nth(Mid,List,Elt).
bin_search_inner(Elt,List,Begin,End,Result):-
Begin < End,
Mid is (Begin+End) div 2,
nth(Mid,List,MidElt),
MidElt < Elt,
NewBegin is Mid+1,
bin_search_inner(Elt,List,NewBegin,End,Result).
bin_search_inner(Elt,List,Begin,End,Result):-
Begin < End,
Mid is (Begin+End) div 2,
nth(Mid,List,MidElt),
MidElt > Elt,
NewEnd is Mid-1,
bin_search_inner(Elt,List,Begin,NewEnd,Result).