static boolean isSlopeGood ( double slope , int arr [ ] , int n ) {
  Set < Double > setOfLines = new HashSet < Double > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) setOfLines . add ( arr [ i ] - slope * ( i ) ) ;
  return setOfLines . size ( ) == 2 ;
}

static boolean isSlopeGood ( double slope , int arr [ ] , int n ) { Set < Double > setOfLines = new HashSet < Double > ( ) ; for ( int i = 0 ; i < n ; i ++ ) setOfLines . add ( arr [ i ] - slope * ( i ) ) ; return setOfLines . size ( ) == 2 ; }
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