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226_InvertBinaryTree226.java

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/**

* Invert a binary tree.

*

* 4

* / \

* 2 7

* / \ / \

* 1 3 6 9

*

* to

*

* 4

* / \

* 7 2

* / \ / \

* 9 6 3 1

*

*/

/**

* Definition for a binary tree node.

* public class TreeNode {

* int val;

* TreeNode left;

* TreeNode right;

* TreeNode(int x) { val = x; }

* }

*/

public class InvertBinaryTree226 {

public TreeNode invertTree(TreeNode root) {

if (root == null || (root.left == null && root.right == null)) {

return root;

}

TreeNode left = invertTree(root.right);

TreeNode right = invertTree(root.left);

root.left = left;

root.right = right;

return root;

}

}