protected RepairDroid.Direction GetNextDirection(RepairDroid.Tile tile, RepairDroid.Direction currentDirection)
{
// Go in the order of the ENUM
// Then if all are filled, go by the next available direction
for (int i = (int)currentDirection + 1; i <= (int)currentDirection + 4; i++)
{
RepairDroid.Direction testDirection = (RepairDroid.Direction)(i % 4);
(int x, int y)pos = GetXY(tile, testDirection);
// If we don't have a tile, we haven't explored. Let's do it!
if (tiles.Count(a => a.x == pos.x && a.y == pos.y) == 0)
{
return(testDirection);
}
}
// We don't have a direction, all are explored
// Find the next available direction that works
for (int i = (int)currentDirection + 1; i <= (int)currentDirection + 4; i++)
{
RepairDroid.Direction testDirection = (RepairDroid.Direction)(i % 4);
(int x, int y)pos = GetXY(tile, testDirection);
// If we don't have a tile, we haven't explored. Let's do it!
if (tiles.First(a => a.x == pos.x && a.y == pos.y).type == RepairDroid.TileType.Hallway)
{
return(testDirection);
}
}
// Backup, this is an infinite loop so hopefully it doesn't happen
return(currentDirection);
}
protected override string SolvePartOne()
{
Intcode intcode = new Intcode(Input, 2);
// We start at 0,0 and map it out
int x = 0;
int y = 0;
RepairDroid.Direction direction = RepairDroid.Direction.North;
// Add the first tile to kickstart us
tiles.Add(new RepairDroid.Tile()
{
x = 0, y = 0, type = RepairDroid.TileType.Hallway
});
while (tiles.Count < 270400)
{
RepairDroid.Tile tile = tiles.First(a => a.x == x && a.y == y);
// We know where we are, let's move
direction = GetNextDirection(tile, direction);
(int x, int y)pos = GetXY(tile, direction);
// Set our direction and run
intcode.SetInput((int)direction);
intcode.Run();
// Check our output
RepairDroid.TileType newTile = (RepairDroid.TileType)Convert.ToInt32(intcode.output_register);
// If this is a wall, don't change x,y
if (newTile != RepairDroid.TileType.Wall)
{
x = pos.x;
y = pos.y;
}
// Add the tile if not already known
if (tiles.Count(a => a.x == pos.x && a.y == pos.y) == 0)
{
tiles.Add(new RepairDroid.Tile()
{
x = pos.x, y = pos.y, type = newTile
});
}
}
return(tiles.Count.ToString());
}
protected (int x, int y) GetXY(RepairDroid.Tile tile, RepairDroid.Direction direction) =>
