day2/src/main.rs

fn main() {
    let input = include_str!("../input.txt");

    let mut part1_possible_id_sum = 0;
    let mut game_power_sum = 0;

    for (index, line) in input.split('\n').enumerate() {
        if line == "" {
            continue;
        }

        let game_data = line.split(": ").collect::<Vec<&str>>()[1];

        let mut part1_possible = true;
        let mut min_red = 0;
        let mut min_green = 0;
        let mut min_blue = 0;

        for round in game_data.split("; ") {

            for draw in round.split(", ") {
                let [number_as_text, color] = draw.split(" ").collect::<Vec<&str>>()[..] else { panic!("Unparseable draw") };

                let number = number_as_text.parse::<i32>().unwrap();

                match color {
                    "red" => {
                        if number > 12 {
                            part1_possible = false;
                        }
                        if number > min_red {
                            min_red = number;
                        }
                    },
                    "green" => {
                        if number > 13 {
                            part1_possible = false;
                        }
                        if number > min_green {
                            min_green = number;
                        }
                    },
                    "blue" => {
                        if number > 14 {
                            part1_possible = false;
                        }
                        if number > min_blue {
                            min_blue = number;
                        }
                    },
                    noncolor => {
                        panic!("bogus color {}", noncolor);
                    }
                }
            }
        }

        if part1_possible {
            part1_possible_id_sum += index + 1;
            println!("Game {} is possible with 12, 13, 14", index + 1);
        } else {
            println!("Game {} is not possible with 12, 13, 14", index + 1);
        }

        let game_power = min_red * min_green * min_blue;
        game_power_sum += game_power;
        println!("Game {} has power {}", index + 1, game_power);
    }

    println!("Possible with 12, 13, 14 ID sum: {}", part1_possible_id_sum);
    println!("Game power sum: {}", game_power_sum);
}