use std::fs::File;
use std::io::{self, BufRead};
use std::path::Path;

fn main() {
    let file_path = String::from("input");
    let mut result_vec = Vec::<u32>::new();

    result_vec.push(0);

    println!("In file {}", file_path);

    if let Ok(lines) = read_lines(file_path) {
        // Consumes the iterator, returns an (Optional) String
        for line in lines {
            if let Ok(ip) = line {
                match ip.as_str() {
                    "" => result_vec.push(0),
                    _ => {
                        let index = result_vec.len() - 1;
                        result_vec[index] += ip.parse::<u32>().unwrap();
                    }
                }
            }
        }
    }

    let index = result_vec.len() - 1;
    result_vec.sort();
    let result = result_vec[index] + result_vec[index - 1] + result_vec[index - 2];
    println!("{}", result);
}

fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>>
where P: AsRef<Path>, {
    let file = File::open(filename)?;
    Ok(io::BufReader::new(file).lines())
}