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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console.log('Hello World')

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🦌 - 2024 DAY 16 SOLUTIONS -🦌 (programming.dev)

submitted 2 days ago by [email protected] to c/[email protected]

24 comments fedilink hide all child comments

Day 16: Reindeer Maze

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[–] [email protected] 3 points 2 days ago (1 children)

prev_nodes[neighbor].append(node)

I think you're adding too many neighbours to the prev_nodes here potentially. At the time you explore the edge, you're not yet sure if the path to the edge's target via the current node will be the cheapest.

[–] [email protected] 3 points 1 day ago* (last edited 1 day ago)

Good catch! IIRC, only when a node is selected from the min heap can we guarantee that the cost to that node will not go any lower. This definitely seems like a bug, but I still got the correct answer for the samples and my input somehow ¯\_(ツ)_/¯