Invert Binary Tree
nvert a binary tree.
4 / \ 2 7 / \ / \ 1 3 6 9
to
4 / \ 7 2 / \ / \ 9 6 3 1
/**
* Definition for a binary tree node.
* struct TreeNode {
* int val;
* TreeNode *left;
* TreeNode *right;
* TreeNode(int x) : val(x), left(NULL), right(NULL) {}
* };
*/
class Solution {
public:
TreeNode *invertTree(TreeNode *root) {
if(root == NULL)
return NULL;
else
{TreeNode *temp =root->right;
root->right = invertTree(root->left);
root->left = invertTree(temp);
return root;
}
}
};