1 #include<stdio.h>
 2 typedef struct{
 3     int element[50];
 4     int front,rear;
 5     int length;
 6     int tag;
 7 }SeqQueue;
 8 void Create(SeqQueue*S)
 9 {
10     int cnt,n;
11     scanf("%d",&n);
12     if(n)scanf("%d",&S->element[S->rear]);
13     for(cnt=0;cnt<n-1;cnt++)
14     {
15         S->rear=(S->rear+1)%(S->length);
16         scanf("%d",&S->element[S->rear]);
17      } 
18      if(n<S->length&&n)S->tag=2;
19      else if(n==0)S->tag=0;
20      else S->tag=1;//2为非空，0为空，1为满 
21      
22 }
23 void In(SeqQueue*S,int e)
24 {
25     if(S->tag==1)return;
26     else {
27         S->rear=(S->rear+1)%(S->length);
28         S->element[S->rear]=e;
29     }
30     if((S->rear+1)%(S->length)==S->front)S->tag=1;
31 }
32 int Out(SeqQueue*S)
33 {
34     if(S->tag==0)return 0;
35     else{
36         S->element[S->front]=0;
37         if(S->front==S->rear)S->tag=0;
38         else S->front=(S->front+1)%(S->length);
39     }
40 }
41 void Order(SeqQueue*S)
42 {
43     int i;
44     for(i=S->front;i!=S->rear;i=(i+1)%(S->length))
45     printf("%d ",S->element[i]);
46     printf("%d ",S->element[i]);
47 }
48 int main()
49 {
50     SeqQueue S;
51     int e;
52     scanf("%d",&S.length);
53     S.front=0;
54     S.rear=0;
55     Create(&S);
56     scanf("%d",&e);
57     In(&S,e);
58     Order(&S);
59     printf("\n");
60     Out(&S);
61     Order(&S);
62     return 0;
63 }