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# Invert Binary Tree LeetCode Solution

## Problem – Invert Binary Tree LeetCode Solution

Given the `root` of a binary tree, invert the tree, and return its root.

Example 1:

``````Input: root = [4,2,7,1,3,6,9]
Output: [4,7,2,9,6,3,1]
``````

Example 2:

``````Input: root = [2,1,3]
Output: [2,3,1]
``````

Example 3:

``````Input: root = []
Output: []
``````

Constraints:

• The number of nodes in the tree is in the range `[0, 100]`.
• `-100 <= Node.val <= 100`

## Invert Binary Tree LeetCode Solution in Python

``````def invertTree(self, root):
if root:
root.left, root.right = self.invertTree(root.right), self.invertTree(root.left)
return root
``````

## Invert Binary Tree LeetCode Solution in C++

``````TreeNode* invertTree(TreeNode* root) {
if (root) {
invertTree(root->left);
invertTree(root->right);
std::swap(root->left, root->right);
}
return root;
}
``````

## Invert Binary Tree LeetCode Solution in Java

``````public class Solution {
public TreeNode invertTree(TreeNode root) {
if(root == null) return null;
TreeNode tmp = root.left;
root.left = invertTree(root.right);
root.right = invertTree(tmp);
return root;
}
}
``````
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