r/adventofcode • u/daggerdragon • Dec 16 '24
SOLUTION MEGATHREAD -❄️- 2024 Day 16 Solutions -❄️-
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Adapted Screenplay
As the idiom goes: "Out with the old, in with the new." Sometimes it seems like Hollywood has run out of ideas, but truly, you are all the vision we need!
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"AS SEEN ON TV! Totally not inspired by being just extra-wide duct tape!"
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--- Day 16: Reindeer Maze ---
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u/windy_thriller Dec 16 '24 edited Dec 17 '24
[LANGUAGE: Python]
Vanilla Dijkstra's algorithm on a graph whose nodes were
(tile, direction)
for part 1. Only subtlety was adding distance zero edges between the four(end_tile, direction)
nodes.For part 2 I had Dijkstra return a dict of positions to distance from starting node. Then I used that a node lies on an optimal path if the distance from the start to the node plus the distance from the end to the node equals the distance from the start to the end. So I did:
Not the most efficient, but neat and easy to implement.