#include<bits/stdc++.h>

using namespace std;

/*
知识点内容：STL 双端队列deque详解

Deque（双端队列）是一种具有队列和栈的性质的数据结构。双端队列的元素可以从两端弹出，其限定插入和删除操作在表的两端进行。
文档内容参考：
https://www.cnblogs.com/aiguona/p/7281739.html
*/

using namespace std;

int main() {
    deque<int> ideq(20); //Create a deque ideq with 20 elements of default value 0
    deque<int>::iterator pos;
    int i;

    //赋值
    for (i = 0; i < 20; ++i)
        ideq[i] = i;

    //输出deque
    printf("输出deque中数据:\n");
    for (i = 0; i < 20; ++i)
        printf("%d ", ideq[i]);
    putchar('\n');

    //在头尾加入新数据
    printf("\n在头尾加入新数据...\n");
    ideq.push_back(100);
    ideq.push_front(i);

    //输出deque
    printf("\n输出deque中数据:\n");
    for (pos = ideq.begin(); pos != ideq.end(); pos++)
        printf("%d ", *pos);
    putchar('\n');

    //查找
    const int FINDNUMBER = 19;
    printf("\n查找%d\n", FINDNUMBER);
    pos = find(ideq.begin(), ideq.end(), FINDNUMBER);
    if (pos != ideq.end()) {
        printf("find %d success\n", *pos);
    } else
        printf("find failed\n");

    //在头尾删除数据
    printf("\n在头尾删除数据...\n");
    ideq.pop_back();
    ideq.pop_front();

    //输出deque
    printf("\n输出deque中数据:\n");
    for (pos = ideq.begin(); pos != ideq.end(); pos++)
        printf("%d ", *pos);
    putchar('\n');
    return 0;
}