From 8c7809d024e85d0a8acfb794a4db41b0e4bc13e6 Mon Sep 17 00:00:00 2001
From: Shinya Sato <shinnya.sato@gmail.com>
Date: Mon, 2 May 2022 09:49:01 +0900
Subject: v0.8.2-1

---
 comparison/Haskell/qsort-260000.hs | 43 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 comparison/Haskell/qsort-260000.hs

(limited to 'comparison/Haskell/qsort-260000.hs')

diff --git a/comparison/Haskell/qsort-260000.hs b/comparison/Haskell/qsort-260000.hs
new file mode 100644
index 0000000..7115121
--- /dev/null
+++ b/comparison/Haskell/qsort-260000.hs
@@ -0,0 +1,43 @@
+{-
+(* http://www.codecodex.com/wiki/Insertion_sort#Standard_ML *)
+-}
+import System.Random
+
+qsort [] = []
+qsort [x] = [x]
+qsort (x:xs) = (qsort left) ++ [x] ++ (qsort right)
+  where (left, right) = part x xs
+
+part pivot [] = ([], [])
+part pivot (x:xs)
+  | x<pivot = (x:below, above)
+  | otherwise = (below, x:above)
+  where
+    (below, above) = part pivot xs
+
+
+{-
+main = print $ qsort [3,2,8,5]
+-}
+
+
+randomList :: Int -> IO([Int])
+randomList 0 = return []
+randomList n = do
+  r  <- randomRIO (1,10000)
+  rs <- randomList (n-1)
+  return (r:rs)
+
+
+validation [] = True
+validation (x:xs) = validation_cons x xs
+validation_cons x [] = True
+validation_cons x (y:ys) =
+  if x<=y then validation_cons y ys
+  else False
+
+
+main = do
+  list <- randomList 260000
+  let sorted = qsort list
+  print (validation sorted)
-- 
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