From 807a59b81973a74da6b74407fe3bfbf523b53a51 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Max=20K=C3=A4nner?= Date: Tue, 6 Dec 2022 07:26:17 +0100 Subject: [PATCH] Day 6 --- day6/Cargo.lock | 7 +++++++ day6/input.txt | 1 + day6/src/main.rs | 23 +++++++++++++++++++++-- 3 files changed, 29 insertions(+), 2 deletions(-) create mode 100644 day6/Cargo.lock create mode 100644 day6/input.txt diff --git a/day6/Cargo.lock b/day6/Cargo.lock new file mode 100644 index 0000000..a16c0bf --- /dev/null +++ b/day6/Cargo.lock @@ -0,0 +1,7 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +version = 3 + +[[package]] +name = "day6" +version = "0.1.0" diff --git a/day6/input.txt b/day6/input.txt new file mode 100644 index 0000000..19a271d --- /dev/null +++ b/day6/input.txt @@ -0,0 +1 @@ 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diff --git a/day6/src/main.rs b/day6/src/main.rs index e7a11a9..bfdec89 100644 --- a/day6/src/main.rs +++ b/day6/src/main.rs @@ -1,3 +1,22 @@ -fn main() { - println!("Hello, world!"); +use std::{collections::HashSet, fs::read_to_string}; + +fn find_nonrecuring_sequence(input: &[char], length: usize) -> usize { + input + .windows(length) + .enumerate() + .find(|(_, chars)| chars.iter().collect::>().len() == length) + .unwrap_or((input.len(), &[])) + .0 + + length +} + +fn main() { + const PACKET_START_LENGTH: usize = 4; + const MESSAGE_START_LENGTH: usize = 14; + let input = read_to_string("input.txt").unwrap(); + let input = input.chars().collect::>(); + let packet_marker = find_nonrecuring_sequence(&input, PACKET_START_LENGTH); + println!("first packet marker at {packet_marker}"); + let message_marker = find_nonrecuring_sequence(&input, MESSAGE_START_LENGTH); + println!("first message marker at {message_marker}"); }