static int countStr ( int n , int bCount , int cCount ) {
  if ( bCount < 0 || cCount < 0 ) return 0 ;
  if ( n == 0 ) return 1 ;
  if ( bCount == 0 && cCount == 0 ) return 1 ;
  int res = countStr ( n - 1 , bCount , cCount ) ;
  res += countStr ( n - 1 , bCount - 1 , cCount ) ;
  res += countStr ( n - 1 , bCount , cCount - 1 ) ;
  return res ;
}

static int countStr ( int n , int bCount , int cCount ) { if ( bCount < 0 || cCount < 0 ) return 0 ; if ( n == 0 ) return 1 ; if ( bCount == 0 && cCount == 0 ) return 1 ; int res = countStr ( n - 1 , bCount , cCount ) ; res += countStr ( n - 1 , bCount - 1 , cCount ) ; res += countStr ( n - 1 , bCount , cCount - 1 ) ; return res ; }
(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)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) consequence: (return_statement (decimal_integer_literal))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (return_statement (decimal_integer_literal))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) consequence: (return_statement (decimal_integer_literal))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal)) (identifier) (identifier))))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal)) (binary_expression left: (identifier) right: (decimal_integer_literal)) (identifier))))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal)) (identifier) (binary_expression left: (identifier) right: (decimal_integer_literal)))))) (return_statement (identifier))))