Day 2: Cube Conundrum


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  • pnutzh4x0r@lemmy.ndlug.org
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    edit-2
    11 months ago

    This was mostly straightforward… basically just parsing input. Here are my condensed solutions in Python

    Part 1
    Game = dict[str, int]
    
    RED_MAX   = 12
    GREEN_MAX = 13
    BLUE_MAX  = 14
    
    def read_game(stream=sys.stdin) -> Game:
        try:
            game_string, cubes_string = stream.readline().split(':')
        except ValueError:
            return {}
    
        game: Game = defaultdict(int)
        game['id'] = int(game_string.split()[-1])
    
        for cubes in cubes_string.split(';'):
            for cube in cubes.split(','):
                count, color = cube.split()
                game[color] = max(game[color], int(count))
    
        return game
    
    def read_games(stream=sys.stdin) -> Iterator[Game]:
        while game := read_game(stream):
            yield game
    
    def is_valid_game(game: Game) -> bool:
        return all([
            game['red']   <= RED_MAX,
            game['green'] <= GREEN_MAX,
            game['blue']  <= BLUE_MAX,
        ])
    
    def main(stream=sys.stdin) -> None:
        valid_games = filter(is_valid_game, read_games(stream))
        sum_of_ids  = sum(game['id'] for game in valid_games)
        print(sum_of_ids)
    
    Part 2

    For the second part, the main parsing remainded the same. I just had to change what I did with the games I read.

    def power(game: Game) -> int:
        return game['red'] * game['green'] * game['blue']
    
    def main(stream=sys.stdin) -> None:
        sum_of_sets = sum(power(game) for game in read_games(stream))
        print(sum_of_sets)
    

    GitHub Repo