Added reverse_integer

Author: shichao-an

reverse_integer/solution.py

@@ -0,0 +1,13 @@
+class Solution:
+    # @return an integer
+    def reverse(self, x):
+        t = 0
+        if x > 0:
+            positive = True
+        else:
+            positive = False
+            x = -x
+        while x != 0:
+            t = 10 * t + x % 10
+            x /= 10
+        return t if positive else -t