Day 3: Mull It Over
Mix.install([:kino])
input = Kino.Input.textarea("Please paste your input:")Part 1
https://adventofcode.com/2024/day/3
data =
input
|> Kino.Input.read()parse_mul_fun = fn str ->
%{"a" => a, "b" => b} = Regex.named_captures(~r/mul\((?\d+),(?\d+)\)/, str)
String.to_integer(a) * String.to_integer(b)
end
_answer =
data
|> then(&Regex.scan(~r/mul\(\d+,\d+\)/, &1))
|> List.flatten()
|> Enum.map(parse_mul_fun)
|> Enum.sum()Part 2
https://adventofcode.com/2024/day/3#part2
{answer, _} =
data
|> then(&Regex.scan(~r/mul\(\d+,\d+\)|do\(\)|don't\(\)/, &1))
|> List.flatten()
|> Enum.reduce({0, _do? = true}, fn command, {acc, do?} ->
case command do
"do()" ->
{acc, true}
"don't()" ->
{acc, false}
"mul" <> _ ->
case do? do
true -> {acc + parse_mul_fun.(command), do?}
false -> {acc, do?}
end
end
end)
answer