static boolean checkPair ( int arr [ ] , int n ) {
  int sum = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    sum += arr [ i ] ;
  }
  if ( sum % 2 != 0 ) {
    return false ;
  }
  sum = sum / 2 ;
  HashSet < Integer > s = new HashSet < Integer > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int val = sum - arr [ i ] ;
    if ( s . contains ( val ) && val == ( int ) s . toArray ( ) [ s . size ( ) - 1 ] ) {
      System . out . printf ( "Pair elements are %d and %d\n" , arr [ i ] , val ) ;
      return true ;
    }
    s . add ( arr [ i ] ) ;
  }
  return false ;
}

static boolean checkPair ( int arr [ ] , int n ) { int sum = 0 ; for ( int i = 0 ; i < n ; i ++ ) { sum += arr [ i ] ; } if ( sum % 2 != 0 ) { return false ; } sum = sum / 2 ; HashSet < Integer > s = new HashSet < Integer > ( ) ; for ( int i = 0 ; i < n ; i ++ ) { int val = sum - arr [ i ] ; if ( s . contains ( val ) && val == ( int ) s . toArray ( ) [ s . size ( ) - 1 ] ) { System . out . printf ( " Pair ▁ elements ▁ are ▁ % d ▁ and ▁ % d \n " , arr [ i ] , val ) ; return true ; } s . add ( arr [ i ] ) ; } return false ; }
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