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InvertBinaryTree.java
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InvertBinaryTree.java
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/* https://leetcode.com/problems/invert-binary-tree/description/ */
/*
226. Invert Binary Tree
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
*/
/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode() {}
* TreeNode(int val) { this.val = val; }
* TreeNode(int val, TreeNode left, TreeNode right) {
* this.val = val;
* this.left = left;
* this.right = right;
* }
* }
*/
class InvertBinaryTree {
public TreeNode invertTree(TreeNode root) {
if (root == null)
return null;
TreeNode left = root.left;
TreeNode right = root.right;
root.left = invertTree(right);
root.right = invertTree(left);
return root;
}
}