main.rs

use std::env;
use std::fs;

pub fn read_file(day: u8) -> String {
    let cwd = env::current_dir().unwrap();

    let filepath = cwd
        .join("inputs")
        .join(format!("day{:02}.txt", day));

    let f = fs::read_to_string(filepath);
    f.expect("could not open input file")
}

fn main() {
    let mut sum_calories: Vec<u32> = read_file(1)
        .split("\n\n")
        .map(|x| x.split('\n')
            .filter(|x| !x.is_empty())
            .map(|n| n.parse::<u32>().unwrap())
            .sum()
        )
        .collect::<Vec<u32>>();

    sum_calories.sort();

    println!(
        "part 1: {:?}",
            sum_calories.last().unwrap()
        ,
    );

    println!(
        "part 2: {:?}",
            sum_calories.iter().rev().take(3).sum::<u32>()
        ,
    );
}