Update contiguous-array.py

Author: kamyu104

Python/contiguous-array.py

@@ -20,13 +20,12 @@ def findMaxLength(self, nums):
         :rtype: int
         """
         result, count = 0, 0
-        lookup = {0: 0}
-
+        lookup = {0: -1}
         for i, num in enumerate(nums):
             count += 1 if num == 1 else -1
             if count in lookup:
-                result = max(result, i+1 - lookup[count])
+                result = max(result, i - lookup[count])
             else:
-                lookup[count] = i+1
+                lookup[count] = i
 
         return result