static int findSubarrCnt ( int arr [ ] , int n ) {
  int ans = 0 , XOR = 0 ;
  int prefix [ ] = new int [ n ] ;
  for ( int i = 0 ;
  i < n ;
  ++ i ) {
    XOR = XOR ^ arr [ i ] ;
    prefix [ i ] = XOR ;
  }
  HashMap < Integer , Integer > evenGroup = new HashMap < > ( ) ;
  HashMap < Integer , Integer > oddGroup = new HashMap < > ( ) ;
  oddGroup . put ( 0 , 1 ) ;
  for ( int i = 0 ;
  i < n ;
  ++ i ) {
    if ( i % 2 == 1 ) {
      if ( oddGroup . containsKey ( prefix [ i ] ) ) {
        ans += oddGroup . get ( prefix [ i ] ) ;
        oddGroup . put ( prefix [ i ] , oddGroup . get ( prefix [ i ] + 1 ) ) ;
      }
      else {
        oddGroup . put ( prefix [ i ] , 1 ) ;
      }
    }
    else {
      if ( evenGroup . containsKey ( prefix [ i ] ) ) {
        ans += evenGroup . get ( prefix [ i ] ) ;
        evenGroup . put ( prefix [ i ] , evenGroup . get ( prefix [ i ] + 1 ) ) ;
      }
      else {
        evenGroup . put ( prefix [ i ] , 1 ) ;
      }
    }
  }
  return ans ;
}

static int findSubarrCnt ( int arr [ ] , int n ) { int ans = 0 , XOR = 0 ; int prefix [ ] = new int [ n ] ; for ( int i = 0 ; i < n ; ++ i ) { XOR = XOR ^ arr [ i ] ; prefix [ i ] = XOR ; } HashMap < Integer , Integer > evenGroup = new HashMap < > ( ) ; HashMap < Integer , Integer > oddGroup = new HashMap < > ( ) ; oddGroup . put ( 0 , 1 ) ; for ( int i = 0 ; i < n ; ++ i ) { if ( i % 2 == 1 ) { if ( oddGroup . containsKey ( prefix [ i ] ) ) { ans += oddGroup . get ( prefix [ i ] ) ; oddGroup . put ( prefix [ i ] , oddGroup . get ( prefix [ i ] + 1 ) ) ; } else { oddGroup . put ( prefix [ i ] , 1 ) ; } } else { if ( evenGroup . containsKey ( prefix [ i ] ) ) { ans += evenGroup . get ( prefix [ i ] ) ; evenGroup . put ( prefix [ i ] , evenGroup . get ( prefix [ i ] + 1 ) ) ; } else { evenGroup . put ( prefix [ i ] , 1 ) ; } } } return ans ; }
(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))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal)) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) dimensions: (dimensions) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier))))) (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 (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (array_access array: (identifier) index: (identifier))))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier))))) (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)))) (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)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal) (decimal_integer_literal)))) (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: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (block (if_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier))))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)) (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (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))))))) alternative: (block (if_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier))))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)) (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (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))))