Sliding Window Maximum

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

class Program
{
    static int[] Ria(string line = null)
    {
        line ??= Console.ReadLine();
        if (string.IsNullOrWhiteSpace(line)) return Array.Empty<int>();
        return line.Trim().Split(new[] { ' ', ',', '\t' }, StringSplitOptions.RemoveEmptyEntries)
            .Select(int.Parse).ToArray();
    }
    static string[] Rsa()
    {
        int n = int.Parse(Console.ReadLine());
        var arr = new string[n];
        for (int i = 0; i < n; i++) arr[i] = Console.ReadLine();
        return arr;
    }
    static void W(params object[] parts) => Console.WriteLine(string.Join(" ", parts));
    static void Wb(bool v) => Console.WriteLine(v ? "true" : "false");
    static void Wi(int v) => Console.WriteLine(v);
    static void Ws(string v) => Console.WriteLine(v);

    static void Main()
    {
var nums = Ria();
int k = int.Parse(Console.ReadLine());
var dq = new LinkedList<int>();
var res = new List<int>();
for (int i = 0; i < nums.Length; i++) {
    while (dq.Count > 0 && dq.First.Value < i - k + 1) dq.RemoveFirst();
    while (dq.Count > 0 && nums[dq.Last.Value] <= nums[i]) dq.RemoveLast();
    dq.AddLast(i);
    if (i >= k - 1) res.Add(nums[dq.First.Value]);
}
W(string.Join(" ", res));
    }
}