using System;

using System.Collections.Generic;

using System.Linq;

​

internal class User

{

    public int Id { get; set; }

    public string Username { get; set; }

}

​

public class Program

{

    public static void Main()

    {

        var users = new List<User>()

        { 

            new User() {Id = 1, Username = "Wayne"}, 

            new User() {Id = 2, Username = "Juan"}, 

            new User() {Id = 3, Username = "Matt"},

            new User() {Id = 4, Username = "Jordan"},

            new User() {Id = 5, Username = "Henrique"}

        };

        // Expected Output:

        // 1 Wayne

        // 4 Jordan

        // 5 Henrique

        var bannedUsers = new List<int>() { 2, 3 };

        var allowedUsers = AllowedUsers(users, bannedUsers);

​

        foreach (var allowedUser in allowedUsers)

        {

          Console.WriteLine($"{allowedUser.Id} {allowedUser.Username}");

        }

    }

    private static IEnumerable<User> AllowedUsers(IEnumerable<User> users, IEnumerable<int> bannedUserIds)

    {

        //TODO: Complete

        return null;

    }

}