|
| 1 | +from dataclasses import dataclass |
| 2 | +from functools import cached_property, total_ordering |
| 3 | + |
| 4 | +from advent_of_code.util import format_solution, puzzle_input |
| 5 | + |
| 6 | +HIGH_CARD = 1 |
| 7 | +ONE_PAIR = 2 |
| 8 | +TWO_PAIR = 3 |
| 9 | +THREE_OF_A_KIND = 4 |
| 10 | +FULL_HOUSE = 5 |
| 11 | +FOUR_OF_A_KIND = 6 |
| 12 | +FIVE_OF_A_KIND = 7 |
| 13 | + |
| 14 | + |
| 15 | +@total_ordering |
| 16 | +@dataclass(frozen=True) |
| 17 | +class CamelCardsHand: |
| 18 | + """ |
| 19 | + Represent a hand with a bid in a game of Camel Cards |
| 20 | + """ |
| 21 | + |
| 22 | + bid: int |
| 23 | + |
| 24 | + cards: tuple[int, int, int, int, int] |
| 25 | + |
| 26 | + @cached_property |
| 27 | + def hand_type_strength(self) -> int: |
| 28 | + card_value_counts = { |
| 29 | + v: sum(1 for c in self.cards if c == v) for v in set(self.cards) |
| 30 | + } |
| 31 | + card_counts = card_value_counts.values() |
| 32 | + |
| 33 | + if set(card_counts) == {5}: |
| 34 | + return FIVE_OF_A_KIND |
| 35 | + elif set(card_counts) == {4, 1}: |
| 36 | + return FOUR_OF_A_KIND |
| 37 | + elif set(card_counts) == {3, 2}: |
| 38 | + return FULL_HOUSE |
| 39 | + elif set(card_counts) == {3, 1}: |
| 40 | + return THREE_OF_A_KIND |
| 41 | + elif sorted(card_counts) == [1, 2, 2]: |
| 42 | + return TWO_PAIR |
| 43 | + elif 2 in card_counts: |
| 44 | + return ONE_PAIR |
| 45 | + else: |
| 46 | + return HIGH_CARD |
| 47 | + |
| 48 | + def __eq__(self, other: "CamelCardsHand") -> bool: |
| 49 | + return self.cards == other.cards |
| 50 | + |
| 51 | + def __lt__(self, other: "CamelCardsHand") -> bool: |
| 52 | + if self.hand_type_strength < other.hand_type_strength: |
| 53 | + return True |
| 54 | + if self.hand_type_strength == other.hand_type_strength: |
| 55 | + for self_num, other_num in zip(self.cards, other.cards): |
| 56 | + if self_num < other_num: |
| 57 | + return True |
| 58 | + elif self_num == other_num: |
| 59 | + continue |
| 60 | + else: |
| 61 | + return False |
| 62 | + return False |
| 63 | + |
| 64 | + @classmethod |
| 65 | + def from_input(cls, input_line: str) -> "CamelCardsHand": |
| 66 | + cards_part, bid_part = input_line.split() |
| 67 | + |
| 68 | + values_map = { |
| 69 | + "T": 10, |
| 70 | + "J": 11, |
| 71 | + "Q": 12, |
| 72 | + "K": 13, |
| 73 | + "A": 14, |
| 74 | + } |
| 75 | + |
| 76 | + card_values = tuple( |
| 77 | + values_map[v] if v in values_map else int(v) for v in cards_part |
| 78 | + ) |
| 79 | + |
| 80 | + return cls( |
| 81 | + bid=int(bid_part), |
| 82 | + cards=card_values, |
| 83 | + ) |
| 84 | + |
| 85 | + |
| 86 | +def part_1(cards_input: list[str]) -> int: |
| 87 | + hands = [CamelCardsHand.from_input(line) for line in cards_input] |
| 88 | + |
| 89 | + return sum(i * hand.bid for i, hand in enumerate(sorted(hands), start=1)) |
| 90 | + |
| 91 | + |
| 92 | +def part_2(cards_input: list[str]) -> int: |
| 93 | + pass |
| 94 | + |
| 95 | + |
| 96 | +if __name__ == "__main__": |
| 97 | + puzzle = puzzle_input(2023, 7) |
| 98 | + |
| 99 | + print( |
| 100 | + format_solution( |
| 101 | + solver_p1=lambda: part_1(puzzle), |
| 102 | + solver_p2=lambda: part_2(puzzle), |
| 103 | + ) |
| 104 | + ) |
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