Thats really funny…
For me (only tested in office) applying the following diff, calculation took ~34-36 seconds, 5 times in a row… Before the patch it was in the range of 6 to 8…
diff --git a/lib/aoc/11-15/day13.ex b/lib/aoc/11-15/day13.ex
index e8c46d2..e016d4c 100644
--- a/lib/aoc/11-15/day13.ex
+++ b/lib/aoc/11-15/day13.ex
@@ -22,9 +22,8 @@ defmodule AoC.Day13 do
0
|> Stream.iterate(&(&1 + 1))
|> Stream.transform(prepare(input), fn n, fw -> {[severities(fw, n)], fw} end)
- |> Enum.reduce_while(0, fn sevs, acc ->
- if Enum.empty?(sevs), do: {:halt, acc}, else: {:cont, acc + 1}
- end)
+ |> Enum.take_while(&(not Enum.empty?(&1)))
+ |> Enum.count()
end
defp prepare(input) do
