Create 226. Invert Binary Tree.py

Author: 724thomas

leetcode3/최원준/226. Invert Binary 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 invertTree(self, root: TreeNode | None) -> TreeNode | None:
+        def dfs(node):
+            if not node:
+                return
+            
+            node.left, node.right = node.right, node.left
+            dfs(node.left)
+            dfs(node.right)
+        
+        dfs(root)
+        return root