static int difference ( int n ) {
  int S , res ;
  S = ( n * ( n + 1 ) ) / 2 ;
  res = S * ( S - 1 ) ;
  return res ;
}

static int difference ( int n ) { int S , res ; S = ( n * ( n + 1 ) ) / 2 ; res = S * ( S - 1 ) ; return res ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier)) declarator: (variable_declarator name: (identifier))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))))) right: (decimal_integer_literal)))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal)))))) (return_statement (identifier))))