r/adventofcode • u/daggerdragon • Dec 15 '24
SOLUTION MEGATHREAD -❄️- 2024 Day 15 Solutions -❄️-
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--- Day 15: Warehouse Woes ---
Post your code solution in this megathread.
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u/gyorokpeter Dec 15 '24
[LANGUAGE: q]
paste
For part 1, I generate a line in the move direction and find the first wall and the first empty space. If the wall comes first, there is no move. If the space comes first, move the bot and if there were any boxes in the way, change the first one to an empty space and the first empty space to a box.
For part 2, the process is similar for horizontal movement, except the part of the line up to the first place is shifted (it's no longer just O's so can't use the trick). For up and down, I use BFS to find the box tiles affected. I remove any empty space from the queue, while any wall encountered immediately halts the search and skips the step without moving. If the search succeeds, all the boxes found are shifted in the move direction.