private static string CheckMatch(Img working, Dictionary <string, string> recipies)
{
string key = working.ToString();
string result = null;
if (recipies.ContainsKey(key))
{
result = recipies[key];
}
return(result);
}
public Img Flip()
{
Img ret = new Img(Rows);
int flipIdx = ret.Rows.First().Count - 1;
foreach (List <string> row in ret.Rows)
{
string cE = row[flipIdx];
string cF = row[0];
row.RemoveAt(flipIdx);
row.RemoveAt(0);
row.Insert(0, cE);
row.Add(cF);
}
return(ret);
}
public Img Rotate()
{
Img ret = new Img(Rows);
int cnt = ret.Rows.First().Count;
List <List <string> > flipped = new List <List <string> >();
for (int i = 0; i < cnt; i++)
{
List <string> list = ret.Rows.Select(s => s[i]).ToList();
list.Reverse();
flipped.Add(list);
}
ret.Rows = flipped;
return(ret);
}
static void Main(string[] args)
{
Dictionary <string, string> recipies = new Dictionary <string, string>();
foreach (string line in FileIterator.Create("./input.txt"))
{
string[] split = line.Split("=>").Select(s => s.Trim()).ToArray();
recipies.Add(split[0], split[1]);
}
Img full = new Img(".#./..#/###");
for (int i = 0; i < 18; i++)
{
Console.WriteLine($"Iteration {i}");
Img[] split;
List <Img> expanded = new List <Img>();
if (full.Rows.Count % 2 == 0)
{
split = full.Split(2).ToArray();
}
else
{
split = full.Split(3).ToArray();
}
foreach (Img img in split)
{
string result = null;
Img working = img;
while (result == null)
{
result = CheckMatch(working, recipies);
if (result != null)
{
break;
}
working = working.Flip();
result = CheckMatch(working, recipies);
if (result != null)
{
break;
}
working = working.Flip().Rotate();
}
expanded.Add(new Img(result)
{
Row = img.Row, Col = img.Col
});
}
full = expanded[0].Assemble(expanded.Skip(1));
}
int cnt = full.Rows.SelectMany(r => r).Count(r => r.Equals("#"));
Console.WriteLine($"the answer is {cnt}");
Console.ReadKey(true);
}