求算法

Question

循环打印a,b,c,d四个变量的值，且每10次循环中，a、b各打印2次，c、d各打印3次。打印顺序：a-b-c-d-a-b-c-d-c-d-c-d
即输出2个a,2个b,3个c,3个d

Answer 1

so easy, use your head, you'll find a way...

Answer 2

            object[] array = { a, b, c, d };
            for (int i = 0; i < 10; i++)
            {
                int j = i % 4;
                if (i / 4 < 2)
                    Console.WriteLine(array[j]);
                else
                    Console.WriteLine(array[j + 2]);
            }

Answer 3

            for (int i = 1; i <= 100; i++)
            {
                int k = i % 10;
                switch (k)
                {
                    case 1:
                    case 5:
                        Console.WriteLine("a");
                        break;
                    case 2:
                    case 6:
                        Console.WriteLine("b");
                        break;
                    case 3:
                    case 7:
                    case 9:
                        Console.WriteLine("c");
                        break;
                    case 0:
                    case 4:
                    case 8:
                        Console.WriteLine("d");
                        break;
                }
            }

Answer 4

            for (int i = 1; i <= 100; i++)
            {
                int k = i % 10;
                int j = k % 4;
                if (k == 9)
                {
                    Console.Write("c");
                }
                else
                {
                    switch (j)
                    {
                        case 1:
                            Console.Write("a");
                            break;
                        case 2:
                            Console.Write("b");
                            break;
                        case 3:
                            Console.Write("c");
                            break;
                        case 0:
                            Console.Write("d");
                            break;
                    }
                }
            }

Answer 5

????先生成好“aabbcccddd” 然后随机排序就成了