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+open Format
+
+let rec split pivot (alist : int list) =
+ match alist with
+ [] -> ([], [])
+ | (x::xs) ->
+ let (below, above) = split pivot xs in
+ if x<pivot then (x::below, above)
+ else (below, x::above) ;;
+
+let rec qsort (alist : int list) =
+ match alist with
+ [] -> []
+ | pivot::rest ->
+ let (below, above) = split pivot rest
+ in (qsort below) @ [pivot] @ (qsort above) ;;
+
+
+
+
+let rec mkRandList n =
+ match n with
+ 0 -> []
+ | n -> (Random.int 10000)::(mkRandList (n-1)) ;;
+
+
+let rec validation alist =
+ let rec validation_cons x blist =
+ match blist with
+ [] -> true
+ | y::ys -> if x<=y then (validation_cons y ys) else false
+ in
+ match alist with
+ [] -> true
+ | x::xs -> validation_cons x xs;;
+
+
+let () = print_bool (validation (qsort (mkRandList 260000)));;