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/// --- Part Two ---
///
/// Your device's communication system is correctly detecting packets, but still isn't working. It
/// looks like it also needs to look for messages.
///
/// A start-of-message marker is just like a start-of-packet marker, except it consists of 14
/// distinct characters rather than 4.
///
/// Here are the first positions of start-of-message markers for all of the above examples:
///
/// mjqjpqmgbljsphdztnvjfqwrcgsmlb: first marker after character 19
/// bvwbjplbgvbhsrlpgdmjqwftvncz: first marker after character 23
/// nppdvjthqldpwncqszvftbrmjlhg: first marker after character 23
/// nznrnfrfntjfmvfwmzdfjlvtqnbhcprsg: first marker after character 29
/// zcfzfwzzqfrljwzlrfnpqdbhtmscgvjw: first marker after character 26
///
/// How many characters need to be processed before the first start-of-message marker is detected?
use clap::Parser;
use itertools::Itertools;
use std::fs::File;
use std::io::prelude::*;
use std::io::BufReader;
use std::iter::*;
use std::path::PathBuf;
const FILEPATH: &'static str = "examples/input.txt";
const CONS_CHARS: usize = 14;
#[derive(Parser, Debug)]
#[clap(author, version, about, long_about = None)]
struct Cli {
#[clap(short, long, default_value = FILEPATH)]
file: PathBuf,
}
fn main() {
let args = Cli::parse();
let file = File::open(&args.file).unwrap();
let reader = BufReader::new(file);
let line = reader.lines().next().unwrap().unwrap();
let res = line
.into_bytes()
.windows(CONS_CHARS)
.position(|b| b.iter().all_unique())
.unwrap()
+ CONS_CHARS;
println!("{:?}", res);
}
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