static void recaman ( int n ) {
  if ( n <= 0 ) return ;
  System . out . printf ( "%d, " , 0 ) ;
  HashSet < Integer > s = new HashSet < Integer > ( ) ;
  s . add ( 0 ) ;
  int prev = 0 ;
  for ( int i = 1 ;
  i < n ;
  i ++ ) {
    int curr = prev - i ;
    if ( curr < 0 || s . contains ( curr ) ) curr = prev + i ;
    s . add ( curr ) ;
    System . out . printf ( "%d, " , curr ) ;
    prev = curr ;
  }
}

static void recaman ( int n ) { if ( n <= 0 ) return ; System . out . printf ( " % d , ▁ " , 0 ) ; HashSet < Integer > s = new HashSet < Integer > ( ) ; s . add ( 0 ) ; int prev = 0 ; for ( int i = 1 ; i < n ; i ++ ) { int curr = prev - i ; if ( curr < 0 || s . contains ( curr ) ) curr = prev + i ; s . add ( curr ) ; System . out . printf ( " % d , ▁ " , curr ) ; prev = curr ; } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (return_statement)) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal) (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)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (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 (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (identifier)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) consequence: (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (identifier))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal) (identifier)))) (expression_statement (assignment_expression left: (identifier) right: (identifier)))))))