c++//队列，循环队列，双端队列

queue  q;
q.push(i);
q.pop();//不返回值
q.front();//返回队首
q.back();//返回队尾
q.size();
q.empty();

#include
deque q;
q.push_front(x);
q.push_back(x);
q.pop_front();
q.pop_back();
q.clear();
q.empty();
q.size();

typedef struct queue{
	int count;
	int front;
	int rear;
	int data[MAX_SIZE];
}Queue;

void Init(Queue *ptr)
{
	ptr->count=0;
	ptr->rear=-1;
	ptr->front=0;
}

bool QueueFull(Queue *ptr)//判断队列是否满
{
	return ptr->count>=MAX_SIZE;
}

bool QueueEmpty(Queue *ptr)//判断队列是否为空
{
	return ptr->count<=0;
}

void Append(Queue *ptr,int item)//入队列
{
	if(QueueFull(ptr))
	{
		cout<<"满了";
		return;
	}
	else{
		ptr->count++;
		ptr->rear=(ptr->rear+1)%MAX_SIZE;
		ptr->data[ptr->rear]=item;
	}
}

void Pop(Queue *ptr)//出队列
{
	if(QueueEmpty(ptr))
	{
		cout<<"队列为空";
		return;
	}
	else{
		ptr->count--;
		ptr->front=(ptr->front+1)%MAX_SIZE;
	}
}