using System;

using System.Collections.Generic;

​

int wins = 0;

int losses = 0;

int attempts = 0;

int numberOfDoors = 3;

    Random random = new Random();

// Main game loop. Number of simulations can easily be changed from 1000

for (int games = 0; games < 1000; games++)

{

    List<Door> doors = new List<Door>();

    for (int i = 0; i < numberOfDoors; i++)

    {

        doors.Add(new Door { Contents = "goat", Opened = false, PlayerChoice = false, });

    }

​

    // Randomly pick a door for the car to be in

​

    int doorNumWithCar = random.Next(0, numberOfDoors);

    doors[doorNumWithCar].Contents = "car";

    // I set player choice to always be door #1 to make it simpler

    doors[0].PlayerChoice = true;

    // Monty randomly removes one of the 2 doors not chosen by the player.

    // (obviously, he doesn't remove the door with the car)

    int doorMontyOpens;

    while (doors.Count != 2)

    {

        doorMontyOpens = -1;

        while (doorMontyOpens == -1)

        {

            int possibleDoorToBeShown = random.Next(1, doors.Count);

            if (doors[possibleDoorToBeShown].Contents != "car")

            {

                doorMontyOpens = possibleDoorToBeShown;

            }

        }

​

        // I just remove the door since that is essentially what Monty Hall is doing when 

        // He reveals one of the goats

        doors.RemoveAt(doorMontyOpens);

    }

​

    // Since player choice is always door #1 (index 0) and there are only two doors left,

    // we only need to check door #2 at index 1. If it has the car, it is a win. If not, a loss.

    // This simulation only tests the case in which the player changes doors after Monty reveals

    // a door. So it SHOULD usually have about 667 wins and 333 losses. Why do I get 50/50???

    if (doors[1].Contents == "car")

    {

        wins++;

    }

    else

    {

        losses++;

    }

​

    attempts++;

}

​

Console.WriteLine($"{wins}");

Console.WriteLine($"{losses}");

Console.WriteLine($"{attempts}");

public class Door

{

    public string Contents { get; set; }

    public bool Opened { get; set; }

    public bool PlayerChoice { get; set; }

}