AdvenOfCode2022/src/prob1/mod.rs

use std::cmp::Reverse;

pub fn solve_part1(file_path: &str) -> i32 {
    let mut max = 0;
    let mut accumulated = 0;
    std::fs::read_to_string(file_path)
        .unwrap_or_else(|err| panic!("Please provide a text file as an argument: {err}"))
        .lines()
        .for_each(|number| {
            if let Ok(yay) = number.parse::<i32>() {
                accumulated += yay;
            } else {
                max = max.max(accumulated);
                accumulated = 0;
            }
        });
    max
}

pub fn solve_part2(file_path: &str) -> i32 {
    let contents =
        std::fs::read_to_string(file_path).expect("Please provide a text file as an argument.");
    let lines: Vec<&str> = contents.split('\n').collect();
    let mut numbers: Vec<i32> = Vec::with_capacity(lines.len());
    let mut accumulated = 0;
    lines.iter().for_each(|number| {
        if let Ok(yay) = number.parse::<i32>() {
            accumulated += yay;
        } else {
            numbers.push(accumulated);
            accumulated = 0;
        }
    });
    numbers.sort_by_key(|w| Reverse(*w));
    numbers[0] + numbers[1] + numbers[2]
}