NotAwfulTech

386 readers

4 users here now

a community for posting cool tech news you don’t want to sneer at

non-awfulness of tech is not required or else we wouldn’t have any posts

founded 1 year ago

MODERATORS

self@awful.systems

Advent of Code 2024 - Historian goes looking for history in all the wrong places (adventofcode.com)

submitted 3 weeks ago by Architeuthis@awful.systems to c/notawfultech@awful.systems

54 comments fedilink hide all child comments

copy pasting the rules from last year's thread:

Rules: no spoilers.

The other rules are made up aswe go along.

Share code by link to a forge, home page, pastebin (Eric Wastl has one here) or code section in a comment.

you are viewing a single comment's thread
view the rest of the comments

[–] zogwarg@awful.systems 1 points 2 weeks ago* (last edited 2 weeks ago)

Day 9 discussion

Part two for me was also very slow until I, speed up the index search by providing a lower bound for the insertion. for every insertion of size "N", I have an array lower = [null, 12, 36, ...], since from the left any time you find free space for a given size, the next time must be at an index at least one larger, which makes it close to being O(N) [assuming search for the next free space is more or less constant] instead of O(N^2), went from about 30s to 2s. https://github.com/zogwarg/advent-of-code/blob/main/2024/jq/09-b.jq