Recursive C# solution


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    S
    public TreeNode InvertTree(TreeNode root) {
           if (root == null) return null;
    	if (root.left == null && root.right == null) return root;
    
    	if (root.left != null)  InvertTree(root.left);
    	if (root.right != null)  InvertTree(root.right);
    
    	var temp = root.left;
    	root.left = root.right;
    	root.right = temp;
    
    	return root;
        }
    

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