static int xorPairCount ( int arr [ ] , int n , int x ) {
  int result = 0 ;
  HashSet < Integer > s = new HashSet < Integer > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( s . contains ( x ^ arr [ i ] ) && ( x ^ arr [ i ] ) == ( int ) s . toArray ( ) [ s . size ( ) - 1 ] ) {
      result ++ ;
    }
    s . add ( arr [ i ] ) ;
  }
  return result ;
}

static int xorPairCount ( int arr [ ] , int n , int x ) { int result = 0 ; HashSet < Integer > s = new HashSet < Integer > ( ) ; for ( int i = 0 ; i < n ; i ++ ) { if ( s . contains ( x ^ arr [ i ] ) && ( x ^ arr [ i ] ) == ( int ) s . toArray ( ) [ s . size ( ) - 1 ] ) { result ++ ; } s . add ( arr [ i ] ) ; } return result ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier) dimensions: (dimensions)) (formal_parameter type: (integral_type) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments (type_identifier))) arguments: (argument_list)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (array_access array: (identifier) index: (identifier))))) right: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))) right: (cast_expression type: (integral_type) value: (array_access array: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) index: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal))))))) consequence: (block (expression_statement (update_expression (identifier))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier))))))) (return_statement (identifier))))