aoc22/day1/src/main.rs


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use std::collections::BinaryHeap;

fn main() {
    let input = lib::read_input(1);

    part1(&input);
    part2(&input);
}

fn part1(input: &str) {
    let ans: usize = input
        .split("\n\n")
        .map(|elf| {
            elf.split("\n")
                .flat_map(|item| item.parse::<usize>().ok())
                .sum()
        })
        .max()
        .unwrap();

    println!("{}", ans);
}

fn part2(input: &str) {
    let mut heap: BinaryHeap<usize> = input
        .split("\n\n")
        .map(|elf| {
            elf.split("\n")
                .flat_map(|item| item.parse::<usize>().ok())
                .sum()
        })
        .collect();

    println!(
        "{}",
        heap.pop().unwrap() + heap.pop().unwrap() + heap.pop().unwrap()
    );
}