adding max depth of binary tree

Author: daiyongg-kim

maximum-depth-of-binary-tree/daiyongg-kim.py

@@ -0,0 +1,11 @@
+class Solution:
+
+    def maxDepth(self, root: Optional[TreeNode]) -> int:
+
+        if not root:
+            return 0
+        
+        left_depth = self.maxDepth(root.left)
+        right_depth = self.maxDepth(root.right)
+
+        return max(left_depth, right_depth) + 1