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๐ŸฆŒ - 2023 DAY 2 SOLUTIONS -๐ŸฆŒ

Day 2: Cube Conundrum


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  • Not too tricky today. Part 2 wasn't as big of a curveball as yesterday thankfully. I don't think it's the cleanest code I've ever written, but hey - the whole point of this is to get better at Rust, so I'll definitely be learning as I go, and coming back at the end to clean a lot of these up. I think for this one I'd like to look into a parsing crate like nom to clean up all the spliting and unwrapping in the two from() methods.

    https://github.com/capitalpb/advent_of_code_2023/blob/main/src/solvers/day02.rs

    #[derive(Debug)]
    struct Hand {
        blue: usize,
        green: usize,
        red: usize,
    }
    
    impl Hand {
        fn from(input: &str) -> Hand {
            let mut hand = Hand {
                blue: 0,
                green: 0,
                red: 0,
            };
    
            for color in input.split(", ") {
                let color = color.split_once(' ').unwrap();
                match color.1 {
                    "blue" => hand.blue = color.0.parse::().unwrap(),
                    "green" => hand.green = color.0.parse::().unwrap(),
                    "red" => hand.red = color.0.parse::().unwrap(),
                    _ => unreachable!("malformed input"),
                }
            }
    
            hand
        }
    }
    
    #[derive(Debug)]
    struct Game {
        id: usize,
        hands: Vec,
    }
    
    impl Game {
        fn from(input: &str) -> Game {
            let (id, hands) = input.split_once(": ").unwrap();
            let id = id.split_once(" ").unwrap().1.parse::().unwrap();
            let hands = hands.split("; ").map(Hand::from).collect();
            Game { id, hands }
        }
    }
    
    pub struct Day02;
    
    impl Solver for Day02 {
        fn star_one(&self, input: &str) -> String {
            input
                .lines()
                .map(Game::from)
                .filter(|game| {
                    game.hands
                        .iter()
                        .all(|hand| hand.blue <= 14 && hand.green <= 13 && hand.red <= 12)
                })
                .map(|game| game.id)
                .sum::()
                .to_string()
        }
    
        fn star_two(&self, input: &str) -> String {
            input
                .lines()
                .map(Game::from)
                .map(|game| {
                    let max_blue = game.hands.iter().map(|hand| hand.blue).max().unwrap();
                    let max_green = game.hands.iter().map(|hand| hand.green).max().unwrap();
                    let max_red = game.hands.iter().map(|hand| hand.red).max().unwrap();
    
                    max_blue * max_green * max_red
                })
                .sum::()
                .to_string()
        }
    }
    
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