public void Move()
{
//move
switch (currentDirection)
{
case Day13Direction.Left:
Position = new Point(Position.X - 1, Position.Y);
break;
case Day13Direction.Up:
Position = new Point(Position.X, Position.Y - 1);
break;
case Day13Direction.Right:
Position = new Point(Position.X + 1, Position.Y);
break;
case Day13Direction.Down:
Position = new Point(Position.X, Position.Y + 1);
break;
}
//rotate
Day13TrackType currentTrack = Map[Position.X, Position.Y];
switch (currentTrack)
{
case Day13TrackType.None:
throw new Exception("Error! Train out of track!!");
case Day13TrackType.UpDown:
break;
case Day13TrackType.LeftRight:
break;
case Day13TrackType.Left:
switch (currentDirection)
{
case Day13Direction.Left:
currentDirection = Day13Direction.Up;
break;
case Day13Direction.Up:
currentDirection = Day13Direction.Left;
break;
case Day13Direction.Right:
currentDirection = Day13Direction.Down;
break;
case Day13Direction.Down:
currentDirection = Day13Direction.Right;
break;
}
break;
case Day13TrackType.Right:
switch (currentDirection)
{
case Day13Direction.Left:
currentDirection = Day13Direction.Down;
break;
case Day13Direction.Up:
currentDirection = Day13Direction.Right;
break;
case Day13Direction.Right:
currentDirection = Day13Direction.Up;
break;
case Day13Direction.Down:
currentDirection = Day13Direction.Left;
break;
}
break;
case Day13TrackType.All:
currentDirection = (Day13Direction)(((int)currentDirection + DIRECTION_CHANGE[currentPositionInDirectionChange] + 4) % 4);
currentPositionInDirectionChange = (currentPositionInDirectionChange + 1) % DIRECTION_CHANGE.Length;
break;
}
}
public static void Run()
{
var lines = File.ReadAllLines(@"Day13\Input.txt");
Day13TrackType[,] map = new Day13TrackType[lines.Max(x => x.Length), lines.Length];
List <Day13Train> trains = new List <Day13Train>();
for (var y = 0; y < lines.Length; y++)
{
var line = lines[y];
for (int x = 0; x < line.Length; x++)
{
switch (line[x])
{
case '|':
map[x, y] = Day13TrackType.UpDown;
break;
case '-':
map[x, y] = Day13TrackType.LeftRight;
break;
case '+':
map[x, y] = Day13TrackType.All;
break;
case '/':
map[x, y] = Day13TrackType.Right;
break;
case '\\':
map[x, y] = Day13TrackType.Left;
break;
case '>':
map[x, y] = Day13TrackType.LeftRight;
trains.Add(new Day13Train(Day13Direction.Right, new Point(x, y)));
break;
case '<':
map[x, y] = Day13TrackType.LeftRight;
trains.Add(new Day13Train(Day13Direction.Left, new Point(x, y)));
break;
case '^':
map[x, y] = Day13TrackType.UpDown;
trains.Add(new Day13Train(Day13Direction.Up, new Point(x, y)));
break;
case 'v':
map[x, y] = Day13TrackType.UpDown;
trains.Add(new Day13Train(Day13Direction.Down, new Point(x, y)));
break;
}
}
}
foreach (var day13Train in trains)
{
day13Train.Map = map;
}
while (true)
{
trains.Sort(Comparer <Day13Train> .Create((a, b) =>
{
if (a.Position.X == b.Position.X)
{
return(a.Position.Y - b.Position.Y);
}
return(a.Position.X - b.Position.X);
}));
for (var index = 0; index < trains.Count; index++)
{
var day13Train = trains[index];
day13Train.Move();
if (RemovedCrushedTrains())
{
index--;
}
}
if (trains.Count == 1)
{
break;
}
bool RemovedCrushedTrains()
{
var crushedTrains = trains.GroupBy(x => x.Position).Where(x => x.Count() > 1).SelectMany(x => x).ToList();
trains.RemoveAll(x => crushedTrains.Contains(x));
return(crushedTrains.Any());
}
}
Console.WriteLine($"{trains[0].Position.X},{trains[0].Position.Y}");
}
