diff options
Diffstat (limited to '11-20/19.hs')
| -rw-r--r-- | 11-20/19.hs | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/11-20/19.hs b/11-20/19.hs new file mode 100644 index 0000000..f1e795b --- /dev/null +++ b/11-20/19.hs @@ -0,0 +1,6 @@ +rotate :: [a] -> Int -> [a] + +rotate l n = let (a, b) = rot l (if n < 0 then (n + length l) else n) in b ++ a + where rot l@(x:xs) n + | n > 0 = let (a, b) = rot xs (n - 1) in (x:a, b) + | otherwise = ([], l) |