N皇后问题：：

typedef struct {
    int *elem;
}sqlisk;

void main()
{
int i,n,j,p,k,q=0;
  sqlisk l;
clrscr();
printf("Input the Queen is disk");
scanf("%d",&n);
l.elem=(int*)malloc((n+1)*sizeof(int));
for(i=1;i<=n+1;i++)
  l.elem[i]=1;
i=1;
while(1)
  {
   if (l.elem[i]<=n)
     {
       k=1;
       while ((k<=i-1)&&(l.elem[i]-l.elem[k])*(abs(l.elem[i]-l.elem[k])-abs(i-k))!=0)
 k++;
       if (k<=i-1)
 {
  l.elem[i]++;
  continue;
  }
       i++;
       if (i<=n) continue;
       clrscr();
       q++;
       printf("\n\n\n\n\n\n\n");
       printf("      The is number %d:\n\n",q);
       for (i=1;i<=n;i++)
{
 printf("\t\t\t\t");
 for (j=1;j<=n;j++)
   printf(". ");
 for (p=n;p>=(n+1-l.elem[i]);p--)
   printf("\b\b");
   printf("0\n");
 }
       getch();
       l.elem[n]++;
       i=n;
       continue;
      }
     else
   {
    l.elem[i]=1;
    i--;
    if (i<1) return;
    l.elem[i]++;
    continue;
    }
  }
}