hello-algo/codes/csharp/chapter_stack_and_queue/deque.cs

/**
 * File: deque.cs
 * Created Time: 2022-12-30
 * Author: moonache (microin1301@outlook.com)
 */

using NUnit.Framework;

namespace hello_algo.chapter_stack_and_queue
{
    public class deque
    {
        [Test]
        public void Test()
        {
            /* 初始化双向队列 */
            // 在 C# 中，将链表 LinkedList 看作双向队列来使用
            LinkedList<int> deque = new LinkedList<int>();

            /* 元素入队 */
            deque.AddLast(2);   // 添加至队尾
            deque.AddLast(5);
            deque.AddLast(4);
            deque.AddFirst(3);  // 添加至队首
            deque.AddFirst(1);
            Console.WriteLine("双向队列 deque = " + String.Join(",", deque.ToArray()));

            /* 访问元素 */
            int peekFirst = deque.First.Value;  // 队首元素
            Console.WriteLine("队首元素 peekFirst = " + peekFirst);
            int peekLast = deque.Last.Value;    // 队尾元素
            Console.WriteLine("队尾元素 peekLast = " + peekLast);

            /* 元素出队 */
            deque.RemoveFirst();  // 队首元素出队
            Console.WriteLine("队首元素出队后 deque = " + String.Join(",", deque.ToArray()));
            deque.RemoveLast();   // 队尾元素出队
            Console.WriteLine("队尾元素出队后 deque = " + String.Join(",", deque.ToArray()));

            /* 获取双向队列的长度 */
            int size = deque.Count;
            Console.WriteLine("双向队列长度 size = " + size);

            /* 判断双向队列是否为空 */
            bool isEmpty = deque.Count == 0;
            Console.WriteLine("双向队列是否为空 = " + isEmpty);
        }
    }
}