adventofcode2022/day06/part2.rs

37 lines
1.1 KiB
Rust

// Copyright 2022 Christian Ulrich
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// usage: ./part2 < input
pub mod common;
use common::DatastreamWindows;
fn main() -> Result<(), &'static str> {
const WINDOW_SIZE: usize = 14;
let mut result = WINDOW_SIZE;
for window in DatastreamWindows::<WINDOW_SIZE>::from_stdin()? {
if window
.iter()
.all(|byte| window.iter().filter(|b| b == &byte).count() == 1)
{
break;
}
result += 1;
}
println!("{result}");
Ok(())
}