RosettaCodeData/Task/Remove-duplicate-elements/Prolog/remove-duplicate-elements-3.pro
2015-02-20 00:35:01 -05:00

6 lines
172 B
Prolog

member1(X,[H|_]) :- X==H,!.
member1(X,[_|T]) :- member1(X,T).
distinct([],[]).
distinct([H|T],C) :- member1(H,T),!, distinct(T,C).
distinct([H|T],[H|C]) :- distinct(T,C).