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# -*- coding: utf-8 -*-
import dataclasses
from abc import ABC
from functools import reduce
from typing import List, Iterator, Any, Tuple
from aoc import BaseAssignment
@dataclasses.dataclass
class Monkey:
items: List[int]
operation: List[str]
test_divisible: int
test_true: int
test_false: int
inspections: int = 0
@classmethod
def from_input(cls, lines: List[str]):
_, items = lines[1].split(":")
return cls(
items=[int(item) for item in items.split(",")],
operation=lines[2].split(" ")[-2:],
test_divisible=int(lines[3].split(" ")[-1]),
test_true=int(lines[4].split(" ")[-1]),
test_false=int(lines[5].split(" ")[-1]),
)
def new_worry_factor(self, item: int, worry_factor=1) -> int:
operator, value = self.operation
value = item if value == "old" else int(value)
match operator:
case "+":
return item + value
case "*":
return item * value
def throw_to(self, new_worry_factor: int) -> int:
if new_worry_factor % self.test_divisible == 0:
return self.test_true
return self.test_false
def inspect_items(self, worry_divisor: int) -> Iterator[Tuple[int, int]]:
for item in self.items:
self.inspections += 1
new_worry_factor = self.new_worry_factor(item) // worry_divisor
yield new_worry_factor, self.throw_to(new_worry_factor)
self.items = []
class Assignment(BaseAssignment, ABC):
def parse_monkeys(self, input: Iterator[str]):
monkeys = []
monkey = []
for line in input:
if line == "":
monkeys.append(Monkey.from_input(monkey))
monkey = []
continue
monkey.append(line)
if len(monkey) != 0:
monkeys.append(Monkey.from_input(monkey))
return monkeys
def calculate_monkey_business(
self,
monkeys: list[Monkey],
rounds: int,
worry_divisor: int = 1,
common_devisor: int = None,
):
for _ in range(rounds):
for monkey in monkeys:
for item, other_monkey in monkey.inspect_items(worry_divisor):
monkeys[other_monkey].items.append(
item % common_devisor if common_devisor is not None else item
)
a, b = sorted([monkey.inspections for monkey in monkeys])[-2:]
return a * b
class AssignmentOne(Assignment):
example_result = 10605
def run(self, input: Iterator) -> Any:
monkeys = self.parse_monkeys(input)
return self.calculate_monkey_business(monkeys, 20, worry_divisor=3)
class AssignmentTwo(Assignment):
example_result = 2713310158
def run(self, input: Iterator) -> Any:
monkeys = self.parse_monkeys(input)
common_divisor = reduce(lambda c, m: c * m.test_divisible, monkeys, 1)
return self.calculate_monkey_business(
monkeys, 10000, common_devisor=common_divisor
)
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