static int countTwinPairs ( int arr [ ] , int n ) {
  int maxE = Arrays . stream ( arr ) . max ( ) . getAsInt ( ) ;
  computePrime ( maxE ) ;
  int count = 0 ;
  int freq [ ] = new int [ maxE + 1 ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    freq [ arr [ i ] ] ++ ;
  }
  Arrays . sort ( arr ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( Prime [ arr [ i ] ] ) {
      if ( arr [ i ] + 2 < freq . length && freq [ arr [ i ] + 2 ] > 0 && Prime [ arr [ i ] + 2 ] ) {
        count ++ ;
      }
    }
  }
  return count ;
}

static int countTwinPairs ( int arr [ ] , int n ) { int maxE = Arrays . stream ( arr ) . max ( ) . getAsInt ( ) ; computePrime ( maxE ) ; int count = 0 ; int freq [ ] = new int [ maxE + 1 ] ; for ( int i = 0 ; i < n ; i ++ ) { freq [ arr [ i ] ] ++ ; } Arrays . sort ( arr ) ; for ( int i = 0 ; i < n ; i ++ ) { if ( Prime [ arr [ i ] ] ) { if ( arr [ i ] + 2 < freq . length && freq [ arr [ i ] + 2 ] > 0 && Prime [ arr [ i ] + 2 ] ) { count ++ ; } } } return count ; }
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