static int compositeProduct ( int arr [ ] , int n ) {
  int max_val = Arrays . stream ( arr ) . max ( ) . getAsInt ( ) ;
  boolean [ ] prime = new boolean [ max_val + 1 ] ;
  Arrays . fill ( prime , true ) ;
  prime [ 0 ] = true ;
  prime [ 1 ] = true ;
  for ( int p = 2 ;
  p * p <= max_val ;
  p ++ ) {
    if ( prime [ p ] == true ) {
      for ( int i = p * 2 ;
      i <= max_val ;
      i += p ) {
        prime [ i ] = false ;
      }
    }
  }
  int product = 1 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( ! prime [ arr [ i ] ] ) {
      product *= arr [ i ] ;
    }
  }
  return product ;
}

static int compositeProduct ( int arr [ ] , int n ) { int max_val = Arrays . stream ( arr ) . max ( ) . getAsInt ( ) ; boolean [ ] prime = new boolean [ max_val + 1 ] ; Arrays . fill ( prime , true ) ; prime [ 0 ] = true ; prime [ 1 ] = true ; for ( int p = 2 ; p * p <= max_val ; p ++ ) { if ( prime [ p ] == true ) { for ( int i = p * 2 ; i <= max_val ; i += p ) { prime [ i ] = false ; } } } int product = 1 ; for ( int i = 0 ; i < n ; i ++ ) { if ( ! prime [ arr [ i ] ] ) { product *= arr [ i ] ; } } return product ; }
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