public static void main ( String [ ] args ) {
  MyDS ds = new MyDS ( ) ;
  ds . add ( 10 ) ;
  ds . add ( 20 ) ;
  ds . add ( 30 ) ;
  ds . add ( 40 ) ;
  System . out . println ( ds . search ( 30 ) ) ;
  ds . remove ( 20 ) ;
  ds . add ( 50 ) ;
  System . out . println ( ds . search ( 50 ) ) ;
  System . out . println ( ds . getRandom ( ) ) ;
}

public static void main ( String [ ] args ) { MyDS ds = new MyDS ( ) ; ds . add ( 10 ) ; ds . add ( 20 ) ; ds . add ( 30 ) ; ds . add ( 40 ) ; System . out . println ( ds . search ( 30 ) ) ; ds . remove ( 20 ) ; ds . add ( 50 ) ; System . out . println ( ds . search ( 50 ) ) ; System . out . println ( ds . getRandom ( ) ) ; }
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