# Advent of Code 2024 - Day 01 ```elixir Mix.install([ {:req, "~> 0.5"} ]) ``` ## Input ```elixir opts = [headers: [{"cookie", "session=#{System.fetch_env!("LB_AOC_SESSION")}"}]] puzzle_input = Req.get!("https://adventofcode.com/2024/day/1/input", opts).body ``` ```elixir {list_left, list_right} = puzzle_input |> String.split("\n", trim: true) |> Enum.map(fn row -> String.split(row) |> Enum.map(&String.to_integer/1) |> List.to_tuple() end) |> Enum.unzip() ``` ## Part 1 ```elixir Enum.zip( Enum.sort(list_left), Enum.sort(list_right) ) |> Enum.map(fn {a, b} -> abs(a - b) end) |> Enum.sum() ``` ## Part 2 ```elixir frequencies = Enum.frequencies(list_right) ``` ```elixir Enum.reduce(list_left, 0, fn a, acc -> acc + a * Map.get(frequencies, a, 0) end) ``` [](https://livebook.dev/run?url=https%3A%2F%2Fgithub.com%2Fpehbehbeh%2Fadventofcode%2Fblob%2Fmain%2F2024%2F01.livemd) <!-- livebook:{"offset":978,"stamp":{"token":"XCP.IJ3cF5FAnxJRBUQnXfkWdT-LfAZB2UOaOhdH1Y75o4bgTZ-Pw1F1qtJaqNsr6SrVRcXAxVP_r5qwyy2X55N70UxEUXBiT6rbX-4sj3pzpzzPP0x36Rk","version":2}} -->