@@ -0,0 +1,283 @@
+package public_class;%0A%0A// Definition for a Node.%0Apublic class Node %7B%0A    public int val;%0A    public Node left;%0A    public Node right;%0A%0A    public Node() %7B%7D%0A%0A    public Node(int _val,Node _left,Node _right) %7B%0A        val = _val;%0A        left = _left;%0A        right = _right;%0A    %7D%0A%7D;%0A

add Node