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start = File.read!("inputs/day10.txt")
lookAndSayStream =
Stream.iterate(start, fn current ->
Regex.scan(~r/(\d)\1*/, current)
|> Enum.map(fn [seq, _] ->
length = String.length(seq)
type = String.at(seq, 0)
"#{length}#{type}"
end)
|> Enum.join()
end)
[fourtiethEntry] = Stream.drop(lookAndSayStream, 40) |> Enum.take(1)
IO.puts("Fourtieth Entry Length: #{String.length(fourtiethEntry)}")
[fiftiethEntry] = Stream.drop(lookAndSayStream, 50) |> Enum.take(1)
IO.puts("Fiftieth Entry Length: #{String.length(fiftiethEntry)}")
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