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๐ต - 2023 DAY 17 SOLUTIONS -๐ต
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this post was submitted on 17 Dec 2023
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Advent Of Code
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An unofficial home for the advent of code community on programming.dev! Other challenges are also welcome!
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Very not pretty and not efficient. Using what I think is dynamic programming - essentially I just propagate cost total through a (x, y, heading, steps in heading) state space, so every cell in that N-dimensional array holds the minimum total cost known to get to that state which is updated iteratively from the neighbours until it settles down.
Debugging was annoying because terminals aren't great at showing 4D grids. My mistakes were in the initial situation and missing the "4 steps to come to a stop at the end" aspect in part 2.
https://github.com/sjmulder/aoc/blob/master/2023/c/day17.c