use std::env::args;
use std::fs::File;
use std::io::BufRead;
use std::io::BufReader;

pub fn iter_input() -> impl Iterator<Item = String> {
    let path = args().nth(1).unwrap();
    let file = File::open(path).unwrap();
    return BufReader::new(file).lines().map(|l| l.unwrap());
}

#[allow(dead_code)]
pub fn split_once(s: &str, sep: char) -> Option<(&str, &str)> {
    let x = s.find(sep)?;
    return Some((&s[..x], &s[x+1..]));
}