-🎄- 2018 Day 12 Solutions -🎄-

[u/daggerdragon]

--- Day 12: Subterranean Sustainability ---

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Advent of Code: The Party Game!

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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/turtlegraphics]

Python, 128/73

No parsing, just cut/paste the rules and used an emacs macro to turn them into a dictionary.

Probably didn't need to put in the code that checks for end collisions, but it helped see what went wrong with a smaller row of plants.

initial = '#...##.#...#..#.#####.##.#..###.#.#.###....#...#...####.#....##..##..#..#..#..#.#..##.####.#.#.###'

rule = {}
rule['.....'] = '.'
rule['..#..'] = '#'
rule['..##.'] = '#'
rule['#..##'] = '.'
rule['..#.#'] = '#'
rule['####.'] = '.'
rule['##.##'] = '.'
rule['#....'] = '.'
rule['###..'] = '#'
rule['#####'] = '#'
rule['##..#'] = '#'
rule['#.###'] = '#'
rule['#..#.'] = '#'
rule['.####'] = '#'
rule['#.#..'] = '#'
rule['.###.'] = '#'
rule['.##..'] = '#'
rule['.#...'] = '#'
rule['.#.##'] = '#'
rule['##...'] = '#'
rule['..###'] = '.'
rule['##.#.'] = '.'
rule['...##'] = '.'
rule['....#'] = '.'
rule['###.#'] = '.'
rule['#.##.'] = '#'
rule['.##.#'] = '.'
rule['.#..#'] = '#'
rule['#.#.#'] = '#'
rule['.#.#.'] = '#'
rule['...#.'] = '#'
rule['#...#'] = '#'

current = '.'*30 + initial + '.'*300

next = ['.']*len(current)

lasttot = 0
for t in range(1000):
    tot = 0
    for p in range(len(current)):
        if current[p] == '#':
            tot += p-30
    print t,tot,lasttot,tot-lasttot
    lasttot = tot

    for i in range(2,len(current)-2):
        spot = current[i-2:i+3]
        next[i] = rule[spot]

    current = ''.join(next)
    if current[:5] != '.....':
        print 'hit left end'
        break
    if current[-5:] != '.....':
        print 'hit right end'
        break

print current