Driver Code
public static void Main ( string [ ] args ) { GFG tree = new GFG ( ) ; tree . root = new Node ( 20 ) ; tree . root . left = new Node ( 8 ) ; tree . root . left . left = new Node ( 4 ) ; tree . root . left . right = new Node ( 12 ) ; tree . root . left . right . left = new Node ( 10 ) ; tree . root . left . right . right = new Node ( 14 ) ; tree . root . right = new Node ( 22 ) ; tree . root . right . right = new Node ( 25 ) ; tree . printBoundary ( tree . root ) ; } }