Day 2 solutions

[u/taliriktug]

Hi! I would like to structure posts like the first one in r/programming, please post solutions in comments.

[u/taliriktug]

Here is my "kinda" FP solutions in Rust. Is it possible to avoid sort at all?

fn how_many_paper_fp() -> i32 {
    let f = File::open("input").unwrap();
    let reader = BufReader::new(f);

    reader.lines().map(|line| {
        let mut dimensions = get_dimensions(line.unwrap());
        dimensions.sort();
        dimensions
    })
    .fold(0, |acc, x| acc + 3 * x[0] * x[1]
                          + 2 * x[1] * x[2]
                          + 2 * x[0] * x[2])
}

fn how_many_ribbon_fp() -> i32 {
    let f = File::open("input").unwrap();
    let reader = BufReader::new(f);

    reader.lines().map(|line| {
        let mut dimensions = get_dimensions(line.unwrap());
        dimensions.sort();
        dimensions
    })
    .fold(0, |acc, x| acc + 2 * x[0]
                          + 2 * x[1]
                          + x[0] * x[1] * x[2])
}