Advent of code day 13

Mix.install([
  {:kino, "~> 0.5.0"}
])

Setup input

example = Kino.Input.textarea("Please paste your input example:")

input = Kino.Input.textarea("Please paste your real input:")

Parse

claws =
  example
  |> Kino.Input.read()
  |> String.split("\n\n", trim: true)
  |> Enum.map(fn line ->
    Regex.scan(~r/\d+/, line)
    |> Enum.map(fn [n | []] -> String.to_integer(n) end)
    |> List.to_tuple()
  end)

# just brute force it, probably need to study equations for part02
defmodule Solver do
  def part1({ax, ay, bx, by, px, py}) do
    for i <- 1..100,
        j <- 1..100 do
      if ax * i + bx * j == px and ay * i + by * j == py do
        i * 3 + j
      else
        0
      end
    end
    |> Enum.filter(fn x -> x != 0 end)
    |> then(fn
      [] -> [0]
      list -> list
    end)
    |> Enum.min()
  end
end

Part 01

Enum.reduce(claws, 0, fn claw, acc ->
  Solver.part1(claw) + acc
end)

Part 02