use std::error::Error;
use std::fs::File;
use std::io::{self, BufRead};
use std::vec::Vec;

fn main() -> Result<(), Box<dyn Error>> {
    let file = File::open("inputs/day1.txt")?;
    let lines = io::BufReader::new(file).lines().map(|l| l.unwrap());

    let mut calories_per_elf: Vec<u32> =
        lines.map(|l| l.parse::<u32>()).fold(vec![0], |mut v, c| {
            if let Ok(cal) = c {
                *v.last_mut().unwrap() += cal;
            } else {
                v.push(0);
            };
            v
        });

    calories_per_elf.sort();
    calories_per_elf.reverse();

    println!("Answer Part1: {}", calories_per_elf[0]);

    let answer2 = calories_per_elf[0] + calories_per_elf[1] + calories_per_elf[2];

    println!("Answer Part2: {}", answer2);

    Ok(())
}