C#实现：给定任意数字，输出在该数字下所有（）括号的集合

 class Program
    {
        static void Main(string[] args)
        {
            getPairs(3, 0, 0, 1, "");
            Console.ReadKey();
        }

        private static void getPairs(int close, int left, int right, int inter, string backet)
        {
            if (left == close && right == close)
            {
                Console.Write(backet + ", ");
            }

            if (left < close)
            {
                getPairs(close, left + 1, right, inter++, backet + "(");
            }
            if (right < left)
            {
                getPairs(close, left, right + 1, inter++, backet + ")");
            }
        }

    }