C# Deque

Deque (Double-Ended Queue) is a type of data structure that allows insertion and removal of elements from both the front and rear. In C#, it can be implemented using LinkedList<T> and List<T>.

Creating a Deque using LinkedList Class

To create a deque in C#, use LinkedList<T>, where T defines the type of elements stored.

LinkedList<T> deque = new LinkedList<T>();

• T: Specifies the element type.

Example

The below example shows how to implement deque using LinkedList.

using System;
using System.Collections.Generic;

class Program {
  static void Main() {
    LinkedList<int> deque = new LinkedList<int>();

    // Adding elements to the front
    deque.AddFirst(1);
    deque.AddFirst(2);

    // Adding elements to the back
    deque.AddLast(3);
    deque.AddLast(4);

    // Removing elements from the front
    int front = deque.First.Value;
    deque.RemoveFirst();

    // Removing elements from the back
    int back = deque.Last.Value;
    deque.RemoveLast();

    foreach (int value in deque) {
      Console.WriteLine(value);
    }
  }
}

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Output:

1
3

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Creating a Deque using List Class

To create a deque in C#, use List<T>, where T defines the type of elements stored.

List<T> deque = new List<T>();

• T: Specifies the element type.

Example

The below example shows how to implement deque using List.

using System;
using System.Collections.Generic;

class Program {
  static void Main() {
    List<int> deque = new List<int>();

    // Adding elements to the front
    deque.Insert(0, 1);
    deque.Insert(0, 2);

    // Adding elements to the back
    deque.Add(3);
    deque.Add(4);

    // Removing elements from the front
    int front = deque[0];
    deque.RemoveAt(0);

    // Removing elements from the back
    int back = deque[deque.Count - 1];
    deque.RemoveAt(deque.Count - 1);

    foreach (int value in deque) {
      Console.WriteLine(value);
    }
  }
}

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Output:

1
3

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Codebyte Example

Use this example to experiment with implementing a Deque using LinkedList. Enjoy coding!

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