1  static void Main(string[] args)
 2         {
 3             //0 is false ,1 is true.
 4             string[] name = { "A", "B", "C", "D", "E" };
 5             int[] i = new int[5];
 6             for (i[0] = 0; i[0] < 2; i[0]++)
 7             {
 8                 for (i[1] = 0; i[1] < 2; i[1]++)
 9                 {
10                     for (i[2] = 0; i[2] < 2; i[2]++)
11                     {
12                         for (i[3] = 0; i[3] < 2; i[3]++)
13                         {
14                             for (i[4] = 0; i[4] < 2; i[4]++)
15                             {
16                                 if ((i[0] <= i[1]) && (i[1] + i[2] == 1) && (i[2] == i[3]) && (i[3] + i[4] >= 1) &&
17                                     (i[4] == 0 || i[4] + i[0] + i[3] == 3))
18                                 {
19                                     int index = 0;
20                                     foreach (var a in i)
21                                     {
22                                         if (a == 1)
23                                         {
24                                             Console.WriteLine(name[index] + " will join");
25                                         }
26
27                                         else
28                                         {
29                                             Console.WriteLine(name[index] + " will not join");
30                                         }
31                                         index++;
32                                     }
33
34                                 }
35                             }
36                         }
37                     }
38                 }
39             }
40             Console.ReadKey();
41         }