原二叉树:
4
/ \
2 7
/ \ / \
1 3 6 9
反转后的二叉树:
4
/ \
7 2
/ \ / \
9 6 3 1
class Solution {
public TreeNode invertTree(TreeNode root) {
if(root == null){
return null;
}
invertTree(root.left);
invertTree(root.right);
TreeNode temp = root.left;
root.left = root.right;
root.right = temp;
return root;
}
}
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