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法律研究C++ 程序在 STL 中实现双端队列
双端队列是在两端（头部和尾部）执行插入和删除操作的队列数据结构。数据可以在头部和尾部位置插入，也可以从头部和尾部位置删除。
算法
Begin Declare deque vector and iterator. Take the input as per choice. Call the functions within switch operation: d.size() = Returns the size of queue. d.push_back() = It is used to push elements into a deque from the back. d.push_front() = It is used to push elements into a deque from the front. d.pop_back() = It is used to pop or remove elements from a deque from the back. d.pop_front() = It is used to pop or remove elements from a deque from the front. d.front() = Returns the front elements of deque. d.back() = Returns the back elements of deque. Print the elements of deque. End.
示例代码
#include<iostream>
#include <deque>
#include <string>
#include <cstdlib>
using namespace std;
int main() {
deque<int> d;
deque<int>::iterator it;
int c, item;
while (1) {
cout<<"1.Size of the Deque"<<endl;
cout<<"2.Insert Element at the End"<<endl;
cout<<"3.Insert Element at the Front"<<endl;
cout<<"4.Delete Element at the End"<<endl;
cout<<"5.Delete Element at the Front"<<endl;
cout<<"6.Front Element at Deque"<<endl;
cout<<"7.Last Element at Deque"<<endl;
cout<<"8.Display Deque"<<endl;
cout<<"9.Exit"<<endl;
cout<<"Enter your Choice: ";
cin>>c;
switch(c) {
case 1:
cout<<"Size of the Deque: "<<d.size()<<endl;
break;
case 2:
cout<<"Enter value to be inserted at the end: ";
cin>>item;
d.push_back(item);
break;
case 3:
cout<<"Enter value to be inserted at the front: ";
cin>>item;
d.push_front(item);
break;
case 4:
item = d.back();
d.pop_back();
cout<<"Element "<<item<<" deleted"<<endl;
break;
case 5:
item = d.front();
d.pop_front();
cout<<"Element "<<item<<" deleted"<<endl;
break;
case 6:
cout<<"Front Element of the Deque: ";
cout<<d.front()<<endl;
break;
case 7:
cout<<"Back Element of the Deque: ";
cout<<d.back()<<endl;
break;
case 8:
cout<<"Elements of Deque: ";
for (it = d.begin(); it != d.end(); it++)
cout<<*it<<" ";
cout<<endl;
break;
case 9:
exit(1);
break;
default:
cout<<"Wrong Choice"<<endl;
}
}
return 0;
}输出
1.Size of the Deque 2.Insert Element at the End 3.Insert Element at the Front 4.Delete Element at the End 5.Delete Element at the Front 6.Front Element at Deque 7.Last Element at Deque 8.Display Deque 9.Exit Enter your Choice: 1 Size of the Deque: 0 1.Size of the Deque 2.Insert Element at the End 3.Insert Element at the Front 4.Delete Element at the End 5.Delete Element at the Front 6.Front Element at Deque 7.Last Element at Deque 8.Display Deque 9.Exit Enter your Choice: 2 Enter value to be inserted at the end: 1 1.Size of the Deque 2.Insert Element at the End 3.Insert Element at the Front 4.Delete Element at the End 5.Delete Element at the Front 6.Front Element at Deque 7.Last Element at Deque 8.Display Deque 9.Exit Enter your Choice: 3 Enter value to be inserted at the front: 2 1.Size of the Deque 2.Insert Element at the End 3.Insert Element at the Front 4.Delete Element at the End 5.Delete Element at the Front 6.Front Element at Deque 7.Last Element at Deque 8.Display Deque 9.Exit Enter your Choice: 6 Front Element of the Deque: 2 1.Size of the Deque 2.Insert Element at the End 3.Insert Element at the Front 4.Delete Element at the End 5.Delete Element at the Front 6.Front Element at Deque 7.Last Element at Deque 8.Display Deque 9.Exit Enter your Choice: 7 Back Element of the Deque: 1 1.Size of the Deque 2.Insert Element at the End 3.Insert Element at the Front 4.Delete Element at the End 5.Delete Element at the Front 6.Front Element at Deque 7.Last Element at Deque 8.Display Deque 9.Exit Enter your Choice: 1 Size of the Deque: 2 1.Size of the Deque 2.Insert Element at the End 3.Insert Element at the Front 4.Delete Element at the End 5.Delete Element at the Front 6.Front Element at Deque 7.Last Element at Deque 8.Display Deque 9.Exit Enter your Choice: 8 Elements of Deque: 2 1 1.Size of the Deque 2.Insert Element at the End 3.Insert Element at the Front 4.Delete Element at the End 5.Delete Element at the Front 6.Front Element at Deque 7.Last Element at Deque 8.Display Deque 9.Exit Enter your Choice: 2 Enter value to be inserted at the end: 4 1.Size of the Deque 2.Insert Element at the End 3.Insert Element at the Front 4.Delete Element at the End 5.Delete Element at the Front 6.Front Element at Deque 7.Last Element at Deque 8.Display Deque 9.Exit Enter your Choice: 3 Enter value to be inserted at the front: 5 1.Size of the Deque 2.Insert Element at the End 3.Insert Element at the Front 4.Delete Element at the End 5.Delete Element at the Front 6.Front Element at Deque 7.Last Element at Deque 8.Display Deque 9.Exit Enter your Choice: 8 Elements of Deque: 5 2 1 4 1.Size of the Deque 2.Insert Element at the End 3.Insert Element at the Front 4.Delete Element at the End 5.Delete Element at the Front 6.Front Element at Deque 7.Last Element at Deque 8.Display Deque 9.Exit Enter your Choice: 4 Element 4 deleted 1.Size of the Deque 2.Insert Element at the End 3.Insert Element at the Front 4.Delete Element at the End 5.Delete Element at the Front 6.Front Element at Deque 7.Last Element at Deque 8.Display Deque 9.Exit Enter your Choice: 5 Element 5 deleted 1.Size of the Deque 2.Insert Element at the End 3.Insert Element at the Front 4.Delete Element at the End 5.Delete Element at the Front 6.Front Element at Deque 7.Last Element at Deque 8.Display Deque 9.Exit Enter your Choice: 8 Elements of Deque: 2 1 1.Size of the Deque 2.Insert Element at the End 3.Insert Element at the Front 4.Delete Element at the End 5.Delete Element at the Front 6.Front Element at Deque 7.Last Element at Deque 8.Display Deque 9.Exit Enter your Choice: 9
更新于：2019-07-30
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