36 lines
1.0 KiB
Python
36 lines
1.0 KiB
Python
from __future__ import annotations
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from dataclasses import dataclass
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from functools import cached_property
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@dataclass
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class Card:
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winning_numbers: set[int]
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your_numbers: set[int]
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@classmethod
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def parse(cls, desc: str) -> Card:
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try:
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_, numbers_segment = desc.split(":")
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winning_numbers_segment, your_numbers_segment = numbers_segment.split("|")
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winning_numbers = {
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int(n) for n in winning_numbers_segment.strip().split(" ") if n != ""
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}
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your_numbers = {
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int(n) for n in your_numbers_segment.strip().split(" ") if n != ""
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}
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except:
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raise ValueError("Card description is invalid.")
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return Card(winning_numbers, your_numbers)
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@cached_property
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def match_count(self):
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matching_numbers = self.winning_numbers.intersection(self.your_numbers)
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return len(matching_numbers)
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@cached_property
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def points(self):
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return 2 ** (self.match_count - 1) if self.match_count > 0 else 0
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