I'm new to prolog and I'm having difficulties in implementing the following mergesort algorithm. I retrieved bits and pieces of this algorithm online from various sources and put them together. Parts of it may be incorrect but nonetheless I'm trying to get it to return a list in sorted order but it keeps returning false. % sample.pl mergesort(unsortedlist, sortedlist) :- split(unsortedlist, A, B), mergesort(A, Ra), mergesort(B, Rb), merge(Ra, Rb, sortedlist). split([H|T], [H|A], B) :- split(T, B, A). merge([H|T], B, [H|A]) :- merge(T, B, A). % console command ?- mergesort([3,0,6,2,5],X). false. % I want it to return the list in sorted order using the mergesort above

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I'm new to prolog and I'm having difficulties in implementing the following mergesort algorithm. I retrieved bits and pieces of this algorithm online from various sources and put them together. Parts of it may be incorrect but nonetheless I'm trying to get it to return a list in sorted order but it keeps returning false.

% sample.pl

mergesort(unsortedlist, sortedlist) :-
   split(unsortedlist, A, B),
   mergesort(A, Ra),
   mergesort(B, Rb),
   merge(Ra, Rb, sortedlist).

split([H|T], [H|A], B) :-
   split(T, B, A).

merge([H|T], B, [H|A]) :-
   merge(T, B, A).


% console command
?- mergesort([3,0,6,2,5],X).
false.

% I want it to return the list in sorted order using the mergesort above

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