Solve 108. Convert Sorted Array to Binary Search Tree

python/108_convert_sorted_array_to_binary_search_tree.py

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+# Definition for a binary tree node.
+# class TreeNode:
+#     def __init__(self, val=0, left=None, right=None):
+#         self.val = val
+#         self.left = left
+#         self.right = right
+
+class Solution:
+    def sortedArrayToBST(self, nums: List[int]) -> Optional[TreeNode]:
+        if nums == []:
+            return None
+
+        mid = len(nums)//2
+        left = nums[:mid]
+        right = nums[mid+1:]
+
+        head = TreeNode(nums[mid])
+        head.left = self.sortedArrayToBST(left)
+        head.right = self.sortedArrayToBST(right)
+        return head