1. /*这题的错误是和同学熬夜找出来的呃= =。。。*/
  2.  
  3. #include<stdio.h>  
  4. #include<string.h>  
  5. int main()  
  6. {  
  7.     int front,rear,i,f,j,n,t,q[10000];  
  8.     char s[20];  
  9.     scanf("%d",&n);  
  10.         rear =0,front=0;  
  11.         for(i=0;i<n;i++)  
  12.         {  
  13.             rear=i;  
  14.             scanf("%d",&q[rear]);  
  15.         }  
  16.         scanf("%d",&n);  
  17.         for(i = 0; i < n; i++)  
  18.         {  
  19.             scanf("%s",s);  
  20.  
  21.             if(strcmp(s,"ASK") == 0)  
  22.             {  
  23.                  scanf("%d",&f);  
  24.                  printf("%d\n",q[front+f-1]);  
  25.             }  
  26.             else if (strcmp(s,"JOIN") == 0)  
  27.             {  
  28.                 scanf("%d",&f);  
  29.                 rear++;  
  30.                 q[rear] = f;  
  31.             }  
  32.             else if(strcmp(s,"FINISH") == 0)  
  33.             {  
  34.                 scanf("%d",&f);  
  35.                 front=front+f;  
  36.                   
  37.             }  
  38.             else if(strcmp(s,"LEAVE") == 0)  
  39.             {  
  40.                 scanf("%d",&f);  
  41.                 for(j = front + f -1;j >front;j--)  
  42.                 {  
  43.                     q[j]=q[j-1];  
  44.                 }  
  45.                 front++;  
  46.  
  47.             }  
  48.             else if(strcmp(s,"LENGTH") == 0)  
  49.             {  
  50.                 printf("%d\n",rear-front+1);  
  51.             }  
  52.  
  53.         }  
  54. }