diff --git a/binary_search_trees/array_to_bst.py b/binary_search_trees/array_to_bst.py
index f69cc42..8a6c4df 100644
--- a/binary_search_trees/array_to_bst.py
+++ b/binary_search_trees/array_to_bst.py
@@ -4,10 +4,23 @@ def __init__(self, value, left = None, right = None):
         self.left = left
         self.right = right
 
+def bst_helper(arr):
+    if arr:
+        this_node_index = len(arr) // 2
+        this_node_val = arr[this_node_index]
+        left_array = arr[0:this_node_index]
+        right_array = arr[(this_node_index + 1):]
+        left_node = bst_helper(left_array)
+        right_node = bst_helper(right_array)
+
+        result = TreeNode(this_node_val, left_node, right_node)
+        return result
+    else:
+        return None
 
 def arr_to_bst(arr):
     """ Given a sorted array, write a function to create a 
         Balanced Binary Search Tree using the elements in the array.
         Return the root of the Binary Search Tree.
     """
-    pass
\ No newline at end of file
+    return bst_helper(arr)
diff --git a/requirements.txt b/requirements.txt
index 77ffa3f..19891d7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,8 +1,8 @@
-attrs==20.3.0
-iniconfig==1.1.1
-packaging==20.8
-pluggy==0.13.1
-py==1.10.0
-pyparsing==2.4.7
-pytest==6.2.1
-toml==0.10.2
+attrs
+iniconfig
+packaging
+pluggy
+py
+pyparsinG
+pytest
+toml