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39 lines
968 B
Python
39 lines
968 B
Python
6 years ago
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from pprint import pprint
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with open('input.txt', 'r') as f:
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raw = [x.strip() for x in f.readlines()]
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initial_state = raw[0].split(' ')[-1]
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rules = dict()
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for rule in raw[2:]:
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x, y = rule.split(' => ')
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rules[x] = y
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print(initial_state)
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pprint(rules)
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gens = 50000000000
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start_idx = 0
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state = initial_state
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print(state)
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for it in range(gens):
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if it % 10000 == 0:
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print('calc at', it, 'state len:', len(state), 'idx', start_idx)
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print(state)
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next = []
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state = '....' + state + '....'
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for i in range(2, len(state) - 2):
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seq = state[i-2:i+3]
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next.append(rules.get(seq) or '.')
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start_idx -= 2
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state = ''.join(next)
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start_idx += len(state) - len(state.lstrip('.'))
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state = state.strip('.')
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# print(' ' * (start_idx + 20) + state, start_idx)
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res = 0
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for i, pot_val in enumerate(state):
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pot_id = i + start_idx
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if pot_val == '#':
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res += pot_id
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print(res)
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