from lib import * input = read_input(2018, 12) lines = input.splitlines() state, _, *rules = lines state = {i for i, x in enumerate(state.split()[-1]) if x == "#"} rules = [x.split()[-1] == "#" for x in sorted(rules, reverse=True)] for _ in range(20): nums = {k + i - 2 for k in state for i in range(5)} state = {k for k in nums if rules[sum(((k + i - 2) in state) * (2 ** (4 - i)) for i in range(5))]} print(sum(state)) state, _, *rules = lines state = {i for i, x in enumerate(state.split()[-1]) if x == "#"} rules = [x.split()[-1] == "#" for x in sorted(rules, reverse=True)] last = None for _ in range(200): nums = {k + i - 2 for k in state for i in range(5)} state = {k for k in nums if rules[sum(((k + i - 2) in state) * (2 ** (4 - i)) for i in range(5))]} s = sum(state) step = s - last if last is not None else None last = s print(s + step * (50000000000 - 200))