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

submitted 2 weeks ago by Architeuthis@awful.systems to c/notawfultech@awful.systems

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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.

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[–] swlabr@awful.systems 3 points 1 week ago (2 children)

d8: done, and nothing to say about it.

[–] gerikson@awful.systems 3 points 1 week ago (1 children)

day 8 part 2

Eric added some 0s in the grid which fucked up my existence code, sneaky devil

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

I almost got done in by floating point arithmetic, I think

8-2 commentary

Used the coordinates of every two same type frequences to create the ilnear equation (y = ax + b) and then fed it all the matrix coordinates to see which belonged to the line. To get the correct number of antinodes I had to check for |y - ax - b| < 0.0001, otherwise I got around 20 too few.