34
submitted 9 months ago* (last edited 9 months ago) by Ategon@programming.dev to c/advent_of_code@programming.dev

Day 5: If You Give a Seed a Fertilizer


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)
  • Code block support is not fully rolled out yet but likely will be in the middle of the event. Try to share solutions as both code blocks and using something such as https://topaz.github.io/paste/ , pastebin, or github (code blocks to future proof it for when 0.19 comes out and since code blocks currently function in some apps and some instances as well if they are running a 0.19 beta)

FAQ


πŸ”’This post will be unlocked when there is a decent amount of submissions on the leaderboard to avoid cheating for top spots

πŸ”“ Unlocked after 27 mins (current record for time, hard one today)

you are viewing a single comment's thread
view the rest of the comments
[-] perviouslyiner@lemm.ee 3 points 9 months ago* (last edited 9 months ago)

This was interesting! So iterating through the solution space would be infeasible here and it seems we need to look for boundaries between regions and follow them to find places where a solution could occur.

Python: https://pastebin.com/8Ckx36fu

  • Make a list of places where location mappings are discontinuous (0, the end of each mapping, and the number before)
  • Repeat this for discontinuities in each intermediate layer
  • Trace each such location to its seed, and filter by seed ranges
  • Run the very minimal set of interesting seed numbers (around 2000 seeds) through the existing part1 algorithm
this post was submitted on 05 Dec 2023
34 points (100.0% liked)

Advent Of Code

736 readers
2 users here now

An unofficial home for the advent of code community on programming.dev!

Advent of Code is an annual Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like.

AoC 2023

Solution Threads

M T W T F S S
1 2 3
4 5 6 7 8 9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25

Rules/Guidelines

Relevant Communities

Relevant Links

Credits

Icon base by Lorc under CC BY 3.0 with modifications to add a gradient

console.log('Hello World')

founded 1 year ago
MODERATORS