Update gray_code.py

yingl · web-flow · commit 18d0086e3018 · 2017-04-25T18:24:59.000+08:00
diff --git a/gray_code.py b/gray_code.py
@@ -1,4 +1,4 @@
-# -*- coding: utf-8 -*-
+# coding: utf-8
 
 class Solution:
     # @param {int} n a number
@@ -8,4 +8,6 @@ def grayCode(self, n):
         ret = []
         for i in xrange(1 << n):
             ret.append((i >> 1) ^ i)
-        return ret
+        return ret
+
+# medium: http://lintcode.com/zh-cn/problem/gray-code/
