this post was submitted on 20 Dec 2024
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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 2024

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Day 20: Race Condition

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)
  • You can send code in code blocks by using three backticks, the code, and then three backticks or use something such as https://topaz.github.io/paste/ if you prefer sending it through a URL

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[โ€“] Gobbel2000@programming.dev 4 points 1 week ago (1 children)

There is exactly one path without cheating, so yes, the distance to one end is always the total distance minus the distance to the other end.

[โ€“] gedhrel@lemmy.world 2 points 1 week ago (1 children)

Gotcha, thanks. I just re-read the problem statement and looked at the input and my input has the strongest possible version of that constraint: the path is unbranching and has start and end at the extremes. Thank-you!

[โ€“] Deebster@programming.dev 2 points 1 week ago

I missed that line too:

Because there is only a single path from the start to the end

So I also did my pathfinding for every variation in the first part, but realised something must be wrong with my approach when I saw part 2.