1 files changed, 9 insertions, 0 deletions
diff --git a/21-28/24.hs b/21-28/24.hs
new file mode 100644
index 0000000..9508438
--- /dev/null
+++ b/21-28/24.hs
@@ -0,0 +1,9 @@
+import System.Random
+diffSelect :: Int -> Int -> IO [Int]
+
+diffSelect n m = d [1..m] n
+    where
+        d l@(x:xs) n | n > 0 = do i <- getStdRandom $ randomR (0, (length l) - 1)
+                                  r <- d (take i l ++ drop (i + 1) l) (n - 1)
+                                  return (l!!i:r)
+        d _ _ = return []