Advent of Code 2024 - Day 3

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

Input

file_input = Kino.Input.file("day_3.txt")

file = Kino.Input.read(file_input)
path = Kino.Input.file_path(file.file_ref)


puzzle_input = File.read!(path)

Part One

Scan the corrupted memory for uncorrupted mul instructions. What do you get if you add up all of the results of the multiplications?

Regex.scan(~r{mul\((\d+),(\d+)\)}, puzzle_input)
|> Enum.map(fn [_, a, b] -> 
  String.to_integer(a) * String.to_integer(b)
end)
|> Enum.sum()

Part Two

There are two new instructions you’ll need to handle:

The do() instruction enables future mul instructions.
The don't() instruction disables future mul instructions.

Regex.scan(~r{do\(\)|don't\(\)|mul\((\d+),(\d+)\)}, puzzle_input)