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Ingy döt Net 2013-04-11 01:07:29 -07:00
parent b83f433714
commit 68f8f3e56b
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Task/Sorting-algorithms-Merge-sort/Logtalk/sorting-algorithms-merge-sort.logtalk Normal file
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msort([], []) :- !.
msort([X], [X]) :- !.
msort([X, Y| Xs], Ys) :-
split([X, Y| Xs], X1s, X2s),
msort(X1s, Y1s),
msort(X2s, Y2s),
merge(Y1s, Y2s, Ys).
split([], [], []).
split([X| Xs], [X| Ys], Zs) :-
split(Xs, Zs, Ys).
merge([X| Xs], [Y| Ys], [X| Zs]) :-
X @=< Y, !,
merge(Xs, [Y| Ys], Zs).
merge([X| Xs], [Y| Ys], [Y| Zs]) :-
X @> Y, !,
merge([X | Xs], Ys, Zs).
merge([], Xs, Xs) :- !.
merge(Xs, [], Xs).