static long comb ( int count , int use ) {
  long r = 1 ;
  for ( int i = use + 1 ;
  i <= count ;
  ++ i ) {
    r *= i ;
    r /= i - use ;
  }
  return r ;
}

static long comb ( int count , int use ) { long r = 1 ; for ( int i = use + 1 ; i <= count ; ++ i ) { r *= i ; r /= i - use ; } return r ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (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: (binary_expression left: (identifier) right: (decimal_integer_literal)))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (identifier) right: (identifier))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (identifier)))))) (return_statement (identifier))))