Today’s problem is really tense. I don’t think I can do it without libgraph .

Here’s my approach with a Map: advent-of-code-2024/lib/advent_of_code2024/day5.ex at main · ibarakaiev/advent-of-code-2024 · GitHub

▶ Brute Enum.sort_by with String.contains?

Here is mine: https://github.com/Aetherus/advent-of-code/blob/60b58f9a2660e8233b8fa3a997adc81517d758f6/2024/day-05.livemd

Here is my solution: https://github.com/bjorng/advent-of-code/blob/main/2024/day05/lib/day05.ex

Insert sort to the rescue :slight_smile: I took the time to check if all possible pairs were defined in the ordering rules, and indeed they are, which makes the puzzle much less hard than what it could have been :slight_smile: defmodule AdventOfCode.Solutions.Y24.Day05 do alias AoC.Input def …

I basically sorted each update (int) based on existence in a set (int*int) on (left, right) and (right, left) (used IComparable). And returned a list of tuples where left element is original update and right is sorted (is desired) update For part 1 - sum of median of left where left = right For pa…

This is the second time I am bitten by part 2. For day 2 I had to use the solution by @bjorng to find the differences between his output and mine and thus find out where I had made an incorrect assumption since my code looked 100% correct (which it was with the wrong assumption). And now part 2 agai…

It looks like there’s a lot of different approaches today, awesome :smiley: https://github.com/sevenseacat/advent_of_code/blob/main/lib/y2024/day05.ex The first problem this year that I thought was too slow with my naive implementation so I added a Task.async_stream to make it faster :smiley: Now …

First, I spent way too long trying to figure out a clever way to generate some kind of tree to represent the order, which I would then process everything through. But I gave up on that and realised it can be much simpler: group_by the pairs to get a map of greater to lesser numbers Compare each p…

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Advent of Code 2024 - Day 5

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igorb December 5, 2024, 6:19am 4

That’s very clever!