From ae71c88c2e410a3c23387d9c393bf2d02a454bdf Mon Sep 17 00:00:00 2001
From: Joe Zhao <ztuowen@gmail.com>
Date: Sat, 31 Jan 2015 21:17:58 +0800
Subject: p7

---
 p7.hs | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 p7.hs

diff --git a/p7.hs b/p7.hs
new file mode 100644
index 0000000..c67b5c5
--- /dev/null
+++ b/p7.hs
@@ -0,0 +1,5 @@
+data NestedList a = Elem a | List [NestedList a]
+
+myFlatten :: NestedList a -> [a]
+myFlatten (Elem x) = [x]
+myFlatten (List x) = concatMap myFlatten x
-- 
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