Advent Of Code

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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

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console.log('Hello World')

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🎁 - 2023 DAY 5 SOLUTIONS -🎁 (programming.dev)

submitted 11 months ago* (last edited 11 months ago) by Ategon@programming.dev to c/advent_of_code@programming.dev

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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)

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[–] perviouslyiner@lemm.ee 3 points 11 months ago* (last edited 11 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