AtegonDec 1, 2024

🌲 - 2024 DAY 1 SOLUTIONS -🌲

https://programming.dev/post/22325778

🌲 - 2024 DAY 1 SOLUTIONS -🌲 - programming.dev

# Day 1: Historian Hysteria ## Megathread guidelines - Keep top level comments as only solutions, if you want to say something other than a solution put it in a new post. (replies to comments can be whatever) - You can send code in code blocks by using three backticks, the code, and then three backticks or use something such as https://blocks.programming.dev [https://blocks.programming.dev] if you prefer sending it through a URL ## FAQ - What is this?: Here is a post with a large amount of details: https://programming.dev/post/22323136 [https://programming.dev/post/22323136] - Where do I participate?: https://adventofcode.com/ [https://adventofcode.com/] - Is there a leaderboard for the community?: We have a programming.dev leaderboard with the info on how to join in this post: https://programming.dev/post/6631465 [https://programming.dev/post/6631465]

Show threadaurele

Elixir

defmodule AdventOfCode.Solution.Year2024.Day01 do use AdventOfCode.Solution.SharedParse @impl true def parse(input) do numbers = input |> String.split("\n", trim: true) |> Enum.map(fn l -> String.split(l, ~r/\s+/) |> Enum.map(&String.to_integer/1) end) {Stream.map(numbers, &Enum.at(&1, 0)), Stream.map(numbers, &Enum.at(&1, 1))} end def part1({left, right}) do Enum.zip_reduce(Enum.sort(left), Enum.sort(right), 0, &(&3 + abs(&1 - &2))) end def part2({left, right}) do freq = Enum.frequencies(right) left |> Stream.map(&(&1 * Map.get(freq, &1, 0))) |> Enum.sum() end end
Dec 6, 2024 at 1:18amWeb
Show thread90s_hackerDec 6, 2024
I’ve honestly forgotten how fucking cool the pipe operator is