public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int t = sc . nextInt ( ) ;
  while ( t > 0 ) {
    int n = sc . nextInt ( ) ;
    int [ ] ans = new int [ n ] ;
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      ans [ i ] = sc . nextInt ( ) ;
    }
    int [ ] frq = new int [ 101 ] ;
    for ( int i = 0 ;
    i < ans . length ;
    i ++ ) {
      frq [ ans [ i ] ] ++ ;
    }
    int c1 = - 1 ;
    int c2 = - 1 ;
    int aa = 0 ;
    boolean onetime = true ;
    boolean tt = false ;
    for ( int i = 0 ;
    i <= 100 ;
    i ++ ) {
      if ( frq [ i ] >= 2 && onetime ) {
        c1 ++ ;
        c2 ++ ;
      }
      else if ( frq [ i ] == 0 ) {
        tt = true ;
        if ( c1 == c2 ) {
          aa = 2 * i ;
        }
        else {
          aa = ++ c2 + ++ c1 ;
        }
        break ;
      }
      else if ( frq [ i ] >= 1 ) {
        c1 ++ ;
        onetime = false ;
      }
    }
    if ( tt ) {
      System . out . println ( aa ) ;
    }
    else {
      System . out . println ( ++ c1 + ++ c2 ) ;
    }
    t -- ;
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int t = sc . nextInt ( ) ; while ( t > 0 ) { int n = sc . nextInt ( ) ; int [ ] ans = new int [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { ans [ i ] = sc . nextInt ( ) ; } int [ ] frq = new int [ 101 ] ; for ( int i = 0 ; i < ans . length ; i ++ ) { frq [ ans [ i ] ] ++ ; } int c1 = - 1 ; int c2 = - 1 ; int aa = 0 ; boolean onetime = true ; boolean tt = false ; for ( int i = 0 ; i <= 100 ; i ++ ) { if ( frq [ i ] >= 2 && onetime ) { c1 ++ ; c2 ++ ; } else if ( frq [ i ] == 0 ) { tt = true ; if ( c1 == c2 ) { aa = 2 * i ; } else { aa = ++ c2 + ++ c1 ; } break ; } else if ( frq [ i ] >= 1 ) { c1 ++ ; onetime = false ; } } if ( tt ) { System . out . println ( aa ) ; } else { System . out . println ( ++ c1 + ++ c2 ) ; } t -- ; } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (while_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) 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: (array_access array: (identifier) index: (identifier)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (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: (field_access object: (identifier) field: (identifier))) update: (update_expression (identifier)) body: (block (expression_statement (update_expression (array_access array: (identifier) index: (array_access array: (identifier) index: (identifier))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (unary_expression operand: (decimal_integer_literal)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (unary_expression operand: (decimal_integer_literal)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (boolean_type) declarator: (variable_declarator name: (identifier) value: (true))) (local_variable_declaration type: (boolean_type) declarator: (variable_declarator name: (identifier) value: (false))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal)) right: (identifier))) consequence: (block (expression_statement (update_expression (identifier))) (expression_statement (update_expression (identifier)))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (true))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (decimal_integer_literal) right: (identifier))))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (update_expression (identifier)) right: (update_expression (identifier))))))) (break_statement)) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal))) consequence: (block (expression_statement (update_expression (identifier))) (expression_statement (assignment_expression left: (identifier) right: (false))))))))) (if_statement condition: (parenthesized_expression (identifier)) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))) alternative: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (update_expression (identifier)) right: (update_expression (identifier)))))))) (expression_statement (update_expression (identifier)))))))