public static int countDistinct ( int arr [ ] , int len ) {
  HashSet < Integer > hs = new HashSet < Integer > ( ) ;
  for ( int i = 0 ;
  i < len ;
  i ++ ) {
    hs . add ( arr [ i ] ) ;
  }
  return hs . size ( ) ;
}

public static int countDistinct ( int arr [ ] , int len ) { HashSet < Integer > hs = new HashSet < Integer > ( ) ; for ( int i = 0 ; i < len ; i ++ ) { hs . add ( arr [ i ] ) ; } return hs . size ( ) ; }
(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: (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)))) (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 (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier))))))) (return_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))