From 3ae71a6adaf7cb9249a1a610c228e8ac84afab6d Mon Sep 17 00:00:00 2001 From: Joe Zhao Date: Wed, 18 Mar 2015 15:09:18 +0800 Subject: +20 +21 +22 +23 +24 +25 --- h25.hs | 8 ++++++++ 1 file changed, 8 insertions(+) create mode 100644 h25.hs (limited to 'h25.hs') diff --git a/h25.hs b/h25.hs new file mode 100644 index 0000000..d590fce --- /dev/null +++ b/h25.hs @@ -0,0 +1,8 @@ +import System.Random + +rnd_permu :: [a] -> IO [a] +rnd_permu [] = return [] +rnd_permu (x:xs) = do + rand <- randomRIO (0, (length xs)) + rest <- rnd_permu xs + return $ let (ys,zs) = splitAt rand rest in ys++(x:zs) -- cgit v1.2.3-70-g09d2