aoc2020 day 1

day1.rs

use std::fs;
use std::io::{BufRead, BufReader, Error};

fn main() -> anyhow::Result<()> {
    let data_file = fs::File::open("data.txt")?;
    let numbers =BufReader::new(data_file)
        .lines()
        .map(|l| Ok(l?.parse()?))
        .collect::<anyhow::Result<Vec<u32>>>()?;
    println!("part one");
    'part1: for num0 in &numbers 
    {
        for num1 in &numbers
        {
            if num0 + num1 == 2020
            {
                println!("{} and {} make {}", num0, num1, num0 * num1);
                break 'part1;
            }
        }
    }

    println!("part two");
    'part2: for num0 in &numbers 
    {
        for num1 in &numbers
        {
            for num2 in &numbers {

                if num0 + num1 + num2 == 2020
                {
                    println!("{} and {} and {} make {}", num0, num1, num2, num0 * num1 * num2);
                    break 'part2;
                }
            }
        }
    }
    Ok(())
}