
 发动机代码 ,开个玩笑。
      if(i==1)
      {
          s->next=q;
          p=s;
      }
      else
      {
          while(j<i-1&&q->next!=null)
           {
               q=q->next;
                j++;
           }
           if(j==i-1)
            {
                s->next=q->next;
                 q->next=s;
            }
           else 
               printf("λÖòÎÊý²»ÕýÈ·!\n");
      }