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use std::env;
fn main() {
let args: Vec<String> = env::args().collect();
if args.len() != 2 {
eprintln!("Usage: {} <filename>", args[0]);
std::process::exit(1);
}
let mut smart_lanternfish: [u64; 9] = [0; 9];
let foo: String = std::fs::read_to_string(&args[1]).unwrap().parse().unwrap();
let mut lanternfish: Vec<u8> = Vec::new();
lanternfish.extend(foo.trim().split(",").map(|x| x.parse::<u8>().unwrap()));
for initial_fish in &lanternfish {
smart_lanternfish[*initial_fish as usize] += 1;
}
// println!("{:?}", smart_lanternfish);
for _day in 0..256 {
smart_lanternfish.rotate_left(1);
smart_lanternfish[6] += smart_lanternfish[8];
// println!(
// "After {day:>width$} days: {lanternfish:?}",
// day = _day,
// width = 2,
// lanternfish = smart_lanternfish
// );
}
println!("{}", smart_lanternfish.iter().sum::<u64>());
}
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