How do I implement a deque in C++ using STL?

How do I implement a deque in C++ using STL?

You can implement a deque in C++ using the Standard Template Library (STL) by including the <deque> header. Here's a simple example:

#include <iostream>
#include <deque>

int main() {
    std::deque<int> myDeque;
    myDeque.push_back(10);
    myDeque.push_front(20);
    std::cout << "Front: " << myDeque.front() << "\n";
    std::cout << "Back: " << myDeque.back() << "\n";
    return 0;
}

What are the advantages of using a deque over a vector?

A deque (double-ended queue) allows for efficient insertion and deletion at both ends, unlike a vector which is optimized for fast access and insertion at the end only. This makes deques more suitable for certain use cases where you need to frequently add or remove elements from both ends.

Can you explain the difference between deque and list in C++?

Certainly! A deque is implemented as a dynamic array, allowing for fast access and modification at both ends. A list, on the other hand, is a doubly linked list, which allows for efficient insertions and deletions but has slower access times since you need to traverse the list.

Are there any specific use cases where a deque is preferred?

Yes, deques are preferred in scenarios where you need to maintain a collection of elements that require frequent additions and removals from both ends, such as in implementing queues, stacks, or when managing a sliding window of data.