use std::fs::File;
use std::io::{prelude::*, BufReader, Error};



pub fn aoc_01_01(filename: &str) -> Result<(), Error> {

    let file = File::open(filename).expect("No file");
    let br = BufReader::new(file);
    let mut v: Vec<i64> = vec![];

    for line in br.lines() {
        v.push(line?
            .trim()
            .parse().unwrap());
    }

    for i in 0..v.len()-2 {
        for j in i+1..v.len()-1 {
            if v[i] + v[j] == 2020 {
                println!("aoc_01_01 result: {}", v[i]*v[j]);
            }
        }
    }

    for i in 0..v.len()-3 {
        for j in i+1..v.len()-2 {
            for k in j+1..v.len()-1 {
                if v[i] + v[j] + v[k] == 2020 {
                    println!("aoc_01_02 result: {}", v[i] * v[j] * v[k]);
                }
            }
        }
    }

    return Ok(());

}