Update factorial.py

yingl · web-flow · commit 9b3edcdba298 · 2018-01-01T12:47:35.000+08:00
diff --git a/factorial.py b/factorial.py
@@ -14,4 +14,4 @@ def factorial(self, n):
             f *= i
         return str(f)
         
-# medium: http://lintcode.com/zh-cn/problem/factorial/
+# hard: http://lintcode.com/zh-cn/problem/factorial/
