using System;

using System.Collections.Generic; using System.Linq; using System.Text; class dayin {     public void print(int[] chess, int N,int o)     {         Console.WriteLine("第"+o+"种方法:\n");         for (int i = 0; i < N; i++)         {             for (int j = 0; j < N; j++)             {                 if (chess[i] == j) Console.Write("*");                 else Console.Write("@");                             }             Console.Write("\n");

        }

    }

}; class dfs {     int[] chess=new int[9];     int o=0;     public bool check(int k)     {         for (int i = 0; i < k; i++)         {             if (Math.Abs(chess[i] - chess[k]) == Math.Abs(i - k)                 || chess[i] == chess[k])                 return false;                     }         return true;     }     public void DFS(int t,int N)     {                   if (t == N)          {              o++;              dayin da = new dayin();              da.print(chess, N,o);

         }

         else          {              for (int i = 0; i < N; i++)              {                  chess[t] = i;                  //dfs che=new dfs();                  if (check(t))                  {                      DFS(t + 1,N);                  }              }          }         return;     } }; namespace ConsoleApplication2 {     class Program     {         static void Main(string[] args)         {             dfs df=new dfs();             df.DFS(0,8);             Console.ReadLine();             return ;         }     } }