#include <iostream>
#include <deque>
using namespace std;
int main(int argc, char* argv[])
{
deque<int> deq;
for (int i = 0; i<6; i++)
{
deq.push_back(i);
}
cout << deq.size() << endl; // 输出:6
cout << deq.max_size() << endl; // 输出:1073741823
deq.resize(0); // 更改元素大小
cout << deq.size() << endl; // 输出:0
if (deq.empty())
cout << "元素为空" << endl; // 输出:元素为空
return 0;
}
#include <iostream>
#include <deque>
using namespace std;
int main(int argc, char* argv[])
{
deque<int> deq;
for (int i = 0; i < 8; i++)
deq.push_back(i);
// 头部删除元素
deq.pop_front();
// 末尾删除元素
deq.pop_back();
// 任意位置删除一个元素
deque<int>::iterator it = deq.begin();
deq.erase(it);
// 删除[first,last]之间的元素
deq.erase(deq.begin(), deq.begin()+1);
// 遍历显示
for (it = deq.begin(); it != deq.end(); it++)
cout << *it << " ";
cout << endl;
// 清空所有元素
deq.clear();
// 遍历显示
for (it = deq.begin(); it != deq.end(); it++)
cout << *it << " "; // 输出:3 4 5 6
cout << endl;
return 0;
}
#include <iostream>
#include <deque>
using namespace std;
int main(int argc, char* argv[])
{
deque<int> deq;
for (int i = 0; i < 6; i++)
deq.push_back(i);
// 下标访问
cout << deq[0] << endl; // 输出:0
// at方法访问
cout << deq.at(0) << endl; // 输出:0
// 访问第一个元素
cout << deq.front() << endl; // 输出:0
// 访问最后一个元素
cout << deq.back() << endl; // 输出:5
return 0;
}
#include <iostream>
#include <deque>
using namespace std;
int main(int argc, char* argv[])
{
// 多个元素赋值
deque<int> deq;
deq.assign(3, 1);
deque<int> deq2;
deq2.assign(3, 2);
// 交换两个容器的元素
deq.swap(deq2);
// 遍历显示
cout << "deq: ";
for (int i = 0; i < deq.size(); i++)
cout << deq[i] << " "; // 输出:2 2 2
cout << endl;
// 遍历显示
cout << "deq2: ";
for (int i = 0; i < deq2.size(); i++)
cout << deq2[i] << " "; // 输出:1 1 1
cout << endl;
return 0;
}
#include <algorithm>
#include <deque>
#include<iostream>
using namespace std;
int main()
{
deque<int> a;
deque<int>::iterator it;
for(it=a.begin();it<=a.end();it++)
{
cout<<*it<<" ";
}
cout<<endl;
a.clear();
for(int i=1;i<=10;i++)
{
a.push_back(i);
}
for(it=a.begin();it<a.end();it++)
{
cout<<*it<<" ";
}
cout<<endl;
reverse(a.begin(), a.end());
for(it=a.begin();it<a.end();it++)
{
cout<<*it<<" ";
}
}
#include <iostream>
#include <deque>
using namespace std;
int main(int argc, char* argv[])
{
deque<int> deq;
deq.push_back(1);
deq.push_back(2);
deq.push_back(3);
cout << *(deq.begin()) << endl; // 输出:1
cout << *(--deq.end()) << endl; // 输出:3
cout << *(deq.cbegin()) << endl; // 输出:1
cout << *(--deq.cend()) << endl; // 输出:3
cout << *(deq.rbegin()) << endl; // 输出:3
cout << *(--deq.rend()) << endl; // 输出:1
cout << endl;
return 0;
}
#include <algorithm>
sort(deq.begin(), deq.end()); // 采用的是从小到大的排序
// 如果想从大到小排序,可以采用先排序后反转的方式,也可以采用下面方法:
// 自定义从大到小的比较器,用来改变排序方式
bool Comp(const int& a, const int& b) {
return a > b;
}
sort(deq.begin(), deq.end(), Comp);
deque<int>::iterator it;
for (it = deq.begin(); it != deq.end(); it++)
cout << *it << endl;
// 或者
for (int i = 0; i < deq.size(); i++) {
cout << deq.at(i) << endl;
}