public static int findMaxGCD ( int arr [ ] , int n ) {
  int high = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) high = Math . max ( high , arr [ i ] ) ;
  int count [ ] = new int [ high + 1 ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) count [ arr [ i ] ] ++ ;
  int counter = 0 ;
  for ( int i = high ;
  i >= 1 ;
  i -- ) {
    int j = i ;
    while ( j <= high ) {
      if ( count [ j ] > 0 ) counter += count [ j ] ;
      j += i ;
      if ( counter == 2 ) return i ;
    }
    counter = 0 ;
  }
  return 1 ;
}

public static int findMaxGCD ( int arr [ ] , int n ) { int high = 0 ; for ( int i = 0 ; i < n ; i ++ ) high = Math . max ( high , arr [ i ] ) ; int count [ ] = new int [ high + 1 ] ; for ( int i = 0 ; i < n ; i ++ ) count [ arr [ i ] ] ++ ; int counter = 0 ; for ( int i = high ; i >= 1 ; i -- ) { int j = i ; while ( j <= high ) { if ( count [ j ] > 0 ) counter += count [ j ] ; j += i ; if ( counter == 2 ) return i ; } counter = 0 ; } return 1 ; }
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