Create find-the-middle-index-in-array.py

Author: kamyu104

Python/find-the-middle-index-in-array.py

@@ -0,0 +1,16 @@
+# Time:  O(n)
+# Space: O(1)
+
+class Solution(object):
+    def findMiddleIndex(self, nums):
+        """
+        :type nums: List[int]
+        :rtype: int
+        """
+        total = sum(nums)
+        accu = 0
+        for i, x in enumerate(nums):
+            if accu*2 == total-x:
+                return i
+            accu += x
+        return -1