Advent of Code 2023 - Day 15

2023/15.livemd

Phil-Bastian Berndt

@pehbehbeh

adventofcode

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Advent of Code 2023 - Day 15

Mix.install([
  {:kino, "~> 0.11.0"},
  {:kino_aoc, github: "ljgago/kino_aoc"}
])

Input

{:ok, puzzle_input} =
  KinoAOC.download_puzzle("2023", "15", System.fetch_env!("LB_AOC_SESSION"))

input =
  puzzle_input
  |> String.split(",", trim: true)
  |> Enum.map(&amp;String.to_charlist/1)

Part 1

hash = fn chars ->
  Enum.reduce(chars, 0, fn c, acc ->
    acc
    |> Kernel.+(c)
    |> Kernel.*(17)
    |> Kernel.rem(256)
  end)
end

input
|> Stream.map(hash)
|> Enum.sum()

Part 2

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