Advent of Code - 2024 - Day 14

var input = await File.ReadAllLinesAsync("input.txt");
var robots = new List<(int Px, int Py, int Vx, int Vy)>();

foreach (var line in input)
{
    var parts = line.Split(' ');
    var pos = parts[0].Split(',');
    var vel = parts[1].Split(',');

    robots.Add((int.Parse(pos[0][2..]), int.Parse(pos[1]), int.Parse(vel[0][2..]), int.Parse(vel[1])));
}

const int width = 101;
const int height = 103;
var count = 0;

while (true)
{
    count++;

    for (var r = 0; r < robots.Count; r++)
    {
        var robot = robots[r];

        var newPosX = (width + (robot.Px + robot.Vx) % width) % width;
        var newPosY = (height + (robot.Py + robot.Vy) % height) % height;

        robots[r] = (newPosX, newPosY, robot.Vx, robot.Vy);
    }

    if (count == 100)
    {
        var topLeft = robots.Count(r => r is { Px: < width / 2, Py: < height / 2 });
        var topRight = robots.Count(r => r is { Px: > width / 2, Py: < height / 2 });
        var bottomLeft = robots.Count(r => r is { Px: < width / 2, Py: > height / 2 });
        var bottomRight = robots.Count(r => r is { Px: > width / 2, Py: > height / 2 });

        Console.WriteLine($"Part 1: {topLeft} * {topRight} * {bottomLeft} * {bottomRight} = {topLeft * topRight * bottomLeft * bottomRight}");
    }

    var positions = robots.Select(r => (r.Px, r.Py)).Distinct().Count();

    if (positions == robots.Count) //No overlapping robots
    {
        Console.WriteLine($"Part 2: {count}");
        Console.WriteLine();

        for (var y = 0; y < height; y++)
        {
            for (var x = 0; x < width; x++)
            {
                Console.Write(robots.Any(r => r.Px == x && r.Py == y) ? '#' : '.');
            }
            Console.WriteLine();
        }

        break;
    }
}