From ab8fe6397a6cbe1fefe08c21c6d6d7f6eff910bc Mon Sep 17 00:00:00 2001
From: Joe Zhao <ztuowen@gmail.com>
Date: Sat, 31 Jan 2015 13:36:53 +0800
Subject: p3p4p5

---
 p3.hs | 7 +++++++
 1 file changed, 7 insertions(+)
 create mode 100644 p3.hs

(limited to 'p3.hs')

diff --git a/p3.hs b/p3.hs
new file mode 100644
index 0000000..7c8604d
--- /dev/null
+++ b/p3.hs
@@ -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
-- 
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