public override void Solve()
{
StreamReader sr = new StreamReader("Inputs/day24.txt");
List <string> lines = new List <string>();
Console.OutputEncoding = System.Text.Encoding.UTF8;
HexTile referenceTile = new HexTile(0, 0);
tilemap.Add(new Tuple <int, int>(referenceTile.x, referenceTile.y), referenceTile);
while (!sr.EndOfStream)
{
string line = sr.ReadLine();
lines.Add(line);
Match m;
HexTile currentTile = referenceTile;
do
{
m = Regex.Match(line, @"(se)|(ne)|(sw)|(nw)|(e)|(w)");
if (m.Success)
{
HexTile.Direction dir = (HexTile.Direction)Enum.Parse(typeof(HexTile.Direction), m.Value.ToUpper());
int x = currentTile.x;
int y = currentTile.y;
switch (dir)
{
case HexTile.Direction.NE:
x++;
y--;
break;
case HexTile.Direction.E:
x++;
break;
case HexTile.Direction.SE:
y++;
break;
case HexTile.Direction.NW:
y--;
break;
case HexTile.Direction.W:
x--;
break;
case HexTile.Direction.SW:
x--;
y++;
break;
}
var pos = new Tuple <int, int>(x, y);
if (!tilemap.ContainsKey(pos))
{
HexTile t = new HexTile(pos.Item1, pos.Item2);
tilemap.Add(pos, t);
}
currentTile = tilemap[pos];
}
line = line.Substring(m.Value.Length);
} while (m.Success);
currentTile.isBlack = !currentTile.isBlack;
}
Console.WriteLine($"Part 1: {tilemap.Values.Count(x => x.isBlack)}");
for (int i = 1; i <= 100; i++)
{
HashSet <Tuple <int, int> > tilesToFill = new HashSet <Tuple <int, int> >();
foreach (var k in tilemap.Keys.ToList())
{
foreach (var d in adjecentDirs)
{
var pos = new Tuple <int, int>(k.Item1 + d.Item1, k.Item2 + d.Item2);
if (!tilemap.ContainsKey(pos))
{
tilesToFill.Add(pos);
}
}
}
foreach (var t in tilesToFill)
{
tilemap.Add(t, new HexTile(t.Item1, t.Item2));
}
var toFlip = new List <Tuple <int, int> >();
foreach (var k in tilemap.Keys)
{
int c = GetAdjecentBlackTileCount(tilemap[k]);
if (tilemap[k].isBlack)
{
if (c == 0 || c > 2)
{
toFlip.Add(k);
}
}
else
{
if (c == 2)
{
toFlip.Add(k);
}
}
}
foreach (var k in toFlip)
{
tilemap[k].isBlack = !tilemap[k].isBlack;
}
Console.WriteLine($"Day {i}: {tilemap.Values.Count(x => x.isBlack)}");
}
Console.WriteLine($"Part 2: {tilemap.Values.Count(x => x.isBlack)}");
}
public HexTile(HexTile h)
{
x = h.x;
y = h.y;
isBlack = h.isBlack;
}
