Merge pull request #2052 from CodingTestStudy2/최민지

[최민지] Day18

Author: github-actions[bot]

leetcode3/최민지/226.py

@@ -0,0 +1,11 @@
+class Solution:
+    def invertTree(self, root: TreeNode | None) -> TreeNode | None:
+        if root is None:
+            return None
+
+        root.left, root.right = root.right, root.left
+
+        self.invertTree(root.left)
+        self.invertTree(root.right)
+
+        return root