static int xorPairCount ( int arr [ ] , int n , int x ) {
  int result = 0 ;
  Map < Integer , Integer > m = new HashMap < > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int curr_xor = x ^ arr [ i ] ;
    if ( m . containsKey ( curr_xor ) ) result += m . get ( curr_xor ) ;
    if ( m . containsKey ( arr [ i ] ) ) {
      m . put ( arr [ i ] , m . get ( arr [ i ] ) + 1 ) ;
    }
    else {
      m . put ( arr [ i ] , 1 ) ;
    }
  }
  return result ;
}

static int xorPairCount ( int arr [ ] , int n , int x ) { int result = 0 ; Map < Integer , Integer > m = new HashMap < > ( ) ; for ( int i = 0 ; i < n ; i ++ ) { int curr_xor = x ^ arr [ i ] ; if ( m . containsKey ( curr_xor ) ) result += m . get ( curr_xor ) ; if ( m . containsKey ( arr [ i ] ) ) { m . put ( arr [ i ] , m . get ( arr [ i ] ) + 1 ) ; } else { m . put ( arr [ i ] , 1 ) ; } } 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) (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments)) 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 (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (array_access array: (identifier) index: (identifier))))) (if_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) consequence: (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))) (if_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier))))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)) (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)))) right: (decimal_integer_literal)))))) alternative: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)) (decimal_integer_literal)))))))) (return_statement (identifier))))