public static void main ( String [ ] args ) {
  Scanner input = new Scanner ( System . in ) ;
  int t = input . nextInt ( ) ;
  while ( t -- > 0 ) {
    int n = input . nextInt ( ) ;
    char [ ] s = input . next ( ) . toCharArray ( ) ;
    int min = - 1 ;
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      if ( s [ i ] == '1' ) {
        int temp = Math . min ( i , n - i - 1 ) ;
        if ( temp < min || min == - 1 ) {
          min = i ;
        }
      }
    }
    int res = 0 ;
    if ( min > - 1 ) {
      int temp = Math . min ( min , n - 1 - min ) ;
      res += 2 * ( n - temp ) ;
    }
    System . out . println ( ( min > - 1 ) ? Math . max ( res , n ) : n ) ;
  }
}

public static void main ( String [ ] args ) { Scanner input = new Scanner ( System . in ) ; int t = input . nextInt ( ) ; while ( t -- > 0 ) { int n = input . nextInt ( ) ; char [ ] s = input . next ( ) . toCharArray ( ) ; int min = - 1 ; for ( int i = 0 ; i < n ; i ++ ) { if ( s [ i ] == '1' ) { int temp = Math . min ( i , n - i - 1 ) ; if ( temp < min || min == - 1 ) { min = i ; } } } int res = 0 ; if ( min > - 1 ) { int temp = Math . min ( min , n - 1 - min ) ; res += 2 * ( n - temp ) ; } System . out . println ( ( min > - 1 ) ? Math . max ( res , n ) : n ) ; } }
(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: (update_expression (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: (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (unary_expression operand: (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: (array_access array: (identifier) index: (identifier)) right: (character_literal))) consequence: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal)))))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (binary_expression left: (identifier) right: (unary_expression operand: (decimal_integer_literal))))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (identifier))))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (unary_expression operand: (decimal_integer_literal)))) consequence: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (identifier)))))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (decimal_integer_literal) right: (parenthesized_expression (binary_expression left: (identifier) right: (identifier)))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (ternary_expression condition: (parenthesized_expression (binary_expression left: (identifier) right: (unary_expression operand: (decimal_integer_literal)))) consequence: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (identifier))) alternative: (identifier)))))))))