advent-of-code-2022/src/day_1.rs

fn elf_calorie_counts(input: &str) -> Vec<u64> {
    input.split("\n\n").map(|elf| {
        elf.split_whitespace().map(|meal| meal.parse().unwrap_or(0)).sum()
    }).collect()
}

pub fn part_1(input: &str) -> u64 {
    let mut elf_calorie_counts= elf_calorie_counts(input);

    elf_calorie_counts.sort_unstable();

    elf_calorie_counts.pop().unwrap()
}

pub fn part_2(input: &str) -> u64 {
    let mut elf_calorie_counts= elf_calorie_counts(input);

    elf_calorie_counts.sort_unstable();
    elf_calorie_counts.reverse();

    elf_calorie_counts.iter().take(3).sum()
}