Leetcode #226 Invert Binary Tree

TreeNode* invertTree(TreeNode* root) {

	if(!root)
		return NULL;
	TreeNode* temp;
	temp = root->left;
	root->left = root->right;
	root->right = temp;
	invertTree(root->left);
	invertTree(root->right);
	return root;
}

簡單的左右子樹互換。