update

Former-commit-id: bdede6ed1b6f578f2ef046c338caf02d0b29d453 [formerly 7187de361b53e9c8ec121df379b762f2db736ea2]
Former-commit-id: 447d58460fbbfd05ffe08428a1288e392637561d

_embed/public/ace/demo/kitchen-sink/docs/prolog.plg

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+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)
+    ).
+ 
+quicksort([])     --> [].
+quicksort([X|Xs]) -->
+    { partition(Xs, X, Smaller, Bigger) },
+    quicksort(Smaller), [X], quicksort(Bigger).
+
+perfect(N) :-
+    between(1, inf, N), U is N // 2,
+    findall(D, (between(1,U,D), N mod D =:= 0), Ds),
+    sumlist(Ds, N).