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| author | Joe Zhao <ztuowen@gmail.com> | 2015-01-31 13:36:53 +0800 |
|---|---|---|
| committer | Joe Zhao <ztuowen@gmail.com> | 2015-01-31 13:36:53 +0800 |
| commit | ab8fe6397a6cbe1fefe08c21c6d6d7f6eff910bc (patch) | |
| tree | 256949990452ed2ce077db8c017aaefeadac896e /p3.hs | |
| parent | 0135b3ac0d41dda2a4c210e7c3989f20b672be5d (diff) | |
| download | h99-ab8fe6397a6cbe1fefe08c21c6d6d7f6eff910bc.tar.gz h99-ab8fe6397a6cbe1fefe08c21c6d6d7f6eff910bc.tar.bz2 h99-ab8fe6397a6cbe1fefe08c21c6d6d7f6eff910bc.zip | |
p3p4p5
Diffstat (limited to 'p3.hs')
| -rw-r--r-- | p3.hs | 7 |
1 files changed, 7 insertions, 0 deletions
@@ -0,0 +1,7 @@ +elementAt :: [a] -> Integer -> Maybe a + +elementAt [] _ = Nothing +elementAt (x:xs) 1 = Just x +elementAt (x:xs) n + | n>1 = elementAt xs (n-1) + | otherwise = Nothing |