Day 4: The Ideal Stocking Stuffer

Mix.install([:kino])

Section

input = Kino.Input.text("Input")

secret = Kino.Input.read(input)

Part 1

Enum.reduce_while(0..999_999, 0, fn i, _ ->
  case :crypto.hash(:md5, secret <> "#{i}") |> Base.encode16() do
    "00000" <> _rest ->
      {:halt, i}

    _ ->
      {:cont, 0}
  end
end)

Part 2

Enum.reduce_while(0..9_999_999, 0, fn i, _ ->
  case :crypto.hash(:md5, secret <> "#{i}") |> Base.encode16() do
    "000000" <> _rest ->
      {:halt, i}

    _ ->
      {:cont, 0}
  end
end)