2024 Day3

Mix.install([
   {:kino, "~> 0.14.2"}
])

Section

kino_input = Kino.Input.textarea("Enter the input")

input = Kino.Input.read(kino_input)

input
|> then(&Regex.scan(~r/mul\((\d+),(\d+)\)/, &1, capture: :all_but_first))
|> Enum.map(fn [x, y] -> String.to_integer(x) * String.to_integer(y) end)
|> Enum.sum()

Part2

defmodule Day3 do
  def number_or_trigger(["", "", "do()"]), do: :do
  def number_or_trigger(["", "", "", "don't()"]), do: :dont
  def number_or_trigger([x, y]), do: String.to_integer(x) * String.to_integer(y) 

  def calc(:do, {acc, _}), do: {acc, true}
  def calc(:dont, {acc, _}), do: {acc, false}
  def calc(number, {acc, true}), do: {acc + number, true}
  def calc(_number, {acc, false}), do: {acc, false}
end

rgx = ~r/mul\((\d+),(\d+)\)|(do\(\))|(don't\(\))/

input
|> then(&Regex.scan(rgx, &1, capture: :all_but_first))
|> Enum.map(&Day3.number_or_trigger/1)
|> Enum.reduce({0, true}, &Day3.calc/2)
|> elem(0)