Create factorial.py

yingl · web-flow · commit 68def8dac3da · 2017-12-31T22:05:40.000+08:00
diff --git a/factorial.py b/factorial.py
@@ -0,0 +1,17 @@
+# coding: utf-8
+
+class Solution:
+    """
+    @param: : an integer
+    @return:  the factorial of n
+    """
+
+    def factorial(self, n):
+        # write your code here
+        # 偷懒做法，实际就是做竖式乘法，Python内部实现了。
+        f = 1
+        for i in range(2, n + 1):
+            f *= i
+        return str(f)
+        
+# medium: http://lintcode.com/zh-cn/problem/factorial/
