69 lines
2.4 KiB
Python
69 lines
2.4 KiB
Python
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from helpers import *
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from math import prod, lcm
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input_stripped = read_day(day)
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monkeys_input = [m.split('\n') for m in input_stripped.split('\n\n')]
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# monkeys_input = [[l.strip() for l in m.split('\n')] for m in input_stripped.split('\n\n')]
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num_regex = re.compile(r'(\d+)')
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op_regex = re.compile(r'Operation: (new = .*)')
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def generate_monkeys(split_input):
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monkeys = {}
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for monkey in monkeys_input:
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m = {
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'id': int(num_regex.findall(monkey[0])[0]),
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'items': [int(x) for x in num_regex.findall(monkey[1])],
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'operation': op_regex.findall(monkey[2])[0],
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'test_divisor': int(num_regex.findall(monkey[3])[0]),
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'true_monkey': int(num_regex.findall(monkey[4])[0]),
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'false_monkey': int(num_regex.findall(monkey[5])[0]),
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'inspections': 0,
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}
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monkeys[m['id']] = m
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return monkeys
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def calculate_monkey_business(monkeys):
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inspections = [m['inspections'] for m in monkeys.values()]
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print(inspections)
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return prod(sorted(inspections)[-2:])
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# Part 1
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monkeys = generate_monkeys(monkeys_input)
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for round in range(20):
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for monkey in monkeys.values():
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for item in monkey['items']:
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worry = item
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old = worry
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new = 0
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exec(monkey['operation'])
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worry = new // 3
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if worry % monkey['test_divisor'] == 0:
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monkeys[monkey['true_monkey']]['items'].append(worry)
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else:
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monkeys[monkey['false_monkey']]['items'].append(worry)
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monkey['inspections'] += 1
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monkey['items'] = []
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print(f'Part 1: {calculate_monkey_business(monkeys)}')
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# Part 2
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monkeys = generate_monkeys(monkeys_input)
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# divisor = prod([m['test_divisor'] for m in monkeys.values()])
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divisor = lcm(*[m['test_divisor'] for m in monkeys.values()])
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print(f'Using modular arithmetic of base: {divisor}')
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for round in range(10000):
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for monkey in monkeys.values():
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for item in monkey['items']:
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worry = item
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old = worry
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new = 0
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exec(monkey['operation'])
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worry = new % divisor
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if worry % monkey['test_divisor'] == 0:
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monkeys[monkey['true_monkey']]['items'].append(worry)
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else:
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monkeys[monkey['false_monkey']]['items'].append(worry)
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monkey['inspections'] += 1
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monkey['items'] = []
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print(f'Part 2: {calculate_monkey_business(monkeys)}')
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