群里的网友抛出了这样一道题

我的算法：

        static void Main(string[] args)          {              /* * a + b - 9 = 4 * + - - * c - d * e =4 * / * - * f + g - h=4 * || || || * 4 4 4 * */              int flag = 50;              for(int a=0;a<14; a++) //a              {                  for (int b = 0; b <14; b++) //b                  {                      //a+b-9=4 故 a+b=13                      if ((a + b) == 13)                      {                          //9-e-h=4 故 e+h=5, e<6,h<6                          for (int e = 0; e < 6; e++)  //e                           {                              for (int h = 0; h < 6; h++)  //h                              {                                  if ((e + h) == 5)                                   {                                      for (int c = 0; c < flag; c++) //c                                      {                                          //b-d*g=4,b[0-13] 故d*g<10,d,g<10                                          for (int d = 0; d < 10; d++) //d d*g<=9                                          {                                              for (int g = 0; g < 10; g++) //g                                              {                                                  //考虑到f为被除数，故f>0,考虑整除c%f==0                                                  for (int f = 1; f < flag; f++) //f                                                  {                                                      while ((c % f )== 0&&(c - d * e) == 4 && (f + g - h) == 4 && (a + c / f) == 4 && (b - d * g) == 4)                                                       {                                                              Console.WriteLine("----------------------------------");                                                              Console.Write("a:{0} ", a.ToString());                                                              Console.Write("b:{0} ", b.ToString());                                                              Console.Write("c:{0} ", c.ToString());                                                              Console.Write("d:{0} ", d.ToString());                                                              Console.Write("e:{0} ", e.ToString());                                                              Console.Write("f:{0} ", f.ToString());                                                              Console.Write("g:{0} ", g.ToString());                                                              Console.WriteLine("h:{0} ", h.ToString());                                                              Console.WriteLine("----------------------------------");                                                              Console.ReadLine();                                                      }                                                                                                                                       }                                              }                                          }                                      }                                  }                              }                          }                      }                  }              }          }