63 lines
1.6 KiB
Python
63 lines
1.6 KiB
Python
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#!/usr/bin/env python3
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from collections import namedtuple, UserDict
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Pot = namedtuple('Pot', ['id', 'plant'])
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Rule = namedtuple('Rule', ['inp', 'out'])
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newgen = None
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class PlantDict(UserDict):
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def __init__(self, cb, initialdata):
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super().__init__(initialdata)
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self._cb = cb
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def __missing__(self, key):
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val = self._cb(key)
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self[key] = val
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return val
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def default_pot(i):
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return Pot(i, False)
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def parse_rule(rule):
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return Rule([c == '#' for c in rule[:5]], '#' in rule.split()[-1])
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def print_pots(pots):
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print(''.join(['#' if pot.plant else '.' for pot in pots]))
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def main():
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# I’m aware that I’m overwriting a builtin here
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input = []
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with open('input') as f:
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input = f.readlines()
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new_gen = PlantDict(default_pot, enumerate([Pot(i, c == '#') for i, c in enumerate(input[0].split(': ')[1])]))
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print_pots(new_gen.values())
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rules = [parse_rule(r) for r in input[2:]]
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before = after = 0
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for i in range(1000):
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before = after
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old_gen = new_gen.copy()
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ids = new_gen.keys()
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for i in range(min(ids) - 2, max(ids) + 3):
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surroundings = [p.plant for p in [old_gen[x] for x in range(i-2, i+3)]]
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for rule in rules:
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if surroundings == rule.inp:
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new_gen[i] = Pot(i, rule.out)
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break
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#print_pots(new_gen.values())
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after = sum([pot.id for pot in new_gen.values() if pot.plant])
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diff = after - before
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print(diff, before)
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print(before + diff * (50000000000 - 999))
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if __name__ == '__main__':
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main()
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