public static void printPairs ( int arr [ ] , int n ) {
  Vector < Integer > v = new Vector < Integer > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) for ( int j = i + 1 ;
  j < n ;
  j ++ ) if ( Math . abs ( arr [ i ] ) == Math . abs ( arr [ j ] ) ) v . add ( Math . abs ( arr [ i ] ) ) ;
  if ( v . size ( ) == 0 ) return ;
  Collections . sort ( v ) ;
  for ( int i = 0 ;
  i < v . size ( ) ;
  i ++ ) System . out . print ( - v . get ( i ) + " " + v . get ( i ) ) ;
}

public static void printPairs ( int arr [ ] , int n ) { Vector < Integer > v = new Vector < Integer > ( ) ; for ( int i = 0 ; i < n ; i ++ ) for ( int j = i + 1 ; j < n ; j ++ ) if ( Math . abs ( arr [ i ] ) == Math . abs ( arr [ j ] ) ) v . add ( Math . abs ( arr [ i ] ) ) ; if ( v . size ( ) == 0 ) return ; Collections . sort ( v ) ; for ( int i = 0 ; i < v . size ( ) ; i ++ ) System . out . print ( - v . get ( i ) + " ▁ " + v . get ( i ) ) ; }
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