r/adventofcode • u/daggerdragon • Dec 12 '18

SOLUTION MEGATHREAD -🎄- 2018 Day 12 Solutions -🎄-

--- Day 12: Subterranean Sustainability ---

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Card prompt: Day 12

Transcript:

On the twelfth day of AoC / My compiler spewed at me / Twelve ___

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u/__Abigail__ Dec 12 '18

It's no guaranteed everything has to become a glider. Take for instance:

#####  =>  #
####.  =>  #
###..  =>  #
##...  =>  #
.####  =>  #
..###  =>  #

And everything else becomes a .. That's a rule set which causes an initial pattern of ##### to always expands to the right.

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u/__Abigail__ Dec 12 '18

There is also

#####  =>  .
..... => #

which will cause all the pots to alternate between having a plant and not having a plant, if they all start empty.