public static void main ( String [ ] args ) {
  node root = new node ( ) ;
  root = newNode ( 50 ) ;
  root . left = newNode ( 30 ) ;
  root . right = newNode ( 70 ) ;
  root . left . left = newNode ( 20 ) ;
  root . left . right = newNode ( 40 ) ;
  root . right . left = newNode ( 60 ) ;
  int level = 2 ;
  int result = sumOfNodesAtNthLevel ( root , level ) ;
  System . out . print ( result ) ;
}

public static void main ( String [ ] args ) { node root = new node ( ) ; root = newNode ( 50 ) ; root . left = newNode ( 30 ) ; root . right = newNode ( 70 ) ; root . left . left = newNode ( 20 ) ; root . left . right = newNode ( 40 ) ; root . right . left = newNode ( 60 ) ; int level = 2 ; int result = sumOfNodesAtNthLevel ( root , level ) ; System . out . print ( result ) ; }
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