排列
用1,2,3...9组成3个三位数abc,def和ghi,每个数字恰好使用一次，要求abc:def:ghi=1:2:3。输出所以解，希望吓哥们能尽快给出解答
[解决办法]
效率可能差了点，不过能算出来

            int n1;
            int n2;
            int n3;

            for (int i = 123456789; i <= 333333333; i = i + 3)
            {
                char[] num = i.ToString().ToCharArray();
                Array.Sort(num);
                if (new string(num) == "123456789")
                {
                    n1 = i / 1000000;
                    n2 = (i - n1 * 1000000)/1000;
                    n3 = i % 1000;

                    if (n2 / (double)n1 == 2 && n3 / (double)n1 == 3)
                        Console.WriteLine(n1 + " " + n2 + " " + n3);
                }
            }

结果
192 384 576
219 438 657
273 546 819
327 654 981