Initial data commit

Task/Sorting-algorithms-Quicksort/Logtalk/sorting-algorithms-quicksort.logtalk

@@ -0,0 +1,17 @@
+quicksort(List, Sorted) :-
+    quicksort(List, [], Sorted).
+
+quicksort([], Sorted, Sorted).
+quicksort([Pivot| Rest], Acc, Sorted) :-
+    partition(Rest, Pivot, Smaller0, Bigger0),
+    quicksort(Smaller0, [Pivot| Bigger], Sorted),
+    quicksort(Bigger0, Acc, Bigger).
+
+partition([], _, [], []).
+partition([X| Xs], Pivot, Smalls, Bigs) :-
+    (   X @< Pivot ->
+        Smalls = [X| Rest],
+        partition(Xs, Pivot, Rest, Bigs)
+    ;   Bigs = [X| Rest],
+        partition(Xs, Pivot, Smalls, Rest)
+    ).