队列，排队买饭

/*这题的错误是和同学熬夜找出来的呃= =。。。*/
 
#include<stdio.h>  
#include<string.h>  
int main()  
{  
    int front,rear,i,f,j,n,t,q[10000];  
    char s[20];  
    scanf("%d",&n);  
        rear =0,front=0;  
        for(i=0;i<n;i++)  
        {  
            rear=i;  
            scanf("%d",&q[rear]);  
        }  
        scanf("%d",&n);  
        for(i = 0; i < n; i++)  
        {  
            scanf("%s",s);  
 
            if(strcmp(s,"ASK") == 0)  
            {  
                 scanf("%d",&f);  
                 printf("%d\n",q[front+f-1]);  
            }  
            else if (strcmp(s,"JOIN") == 0)  
            {  
                scanf("%d",&f);  
                rear++;  
                q[rear] = f;  
            }  
            else if(strcmp(s,"FINISH") == 0)  
            {  
                scanf("%d",&f);  
                front=front+f;  
                  
            }  
            else if(strcmp(s,"LEAVE") == 0)  
            {  
                scanf("%d",&f);  
                for(j = front + f -1;j >front;j--)  
                {  
                    q[j]=q[j-1];  
                }  
                front++;  
 
            }  
            else if(strcmp(s,"LENGTH") == 0)  
            {  
                printf("%d\n",rear-front+1);  
            }  
 
        }  
}