Move Day 6 to its own crate

This commit is contained in:
Eryn Wells 2022-12-16 00:14:34 +00:00
parent b905d7f7fd
commit c04c7adfd2
4 changed files with 26 additions and 15 deletions

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use std::collections::HashSet;
use std::fs::File;
use std::io::{BufRead, BufReader};
pub fn main(filename: &str) -> std::io::Result<()> {
let file = File::open(filename)?;
let reader = BufReader::new(file);
let file_contents: Vec<char> = reader
.lines()
.map(|l| {
l.expect("Couldn't read line")
.chars()
.collect::<Vec<char>>()
})
.flatten()
.collect();
let (sop_offset, start_of_packet_marker) = file_contents
.windows(4)
.enumerate()
.find(|(_, w)| HashSet::<&char>::from_iter(w.iter()).len() == 4)
.expect("Couldn't find start-of-packet marker");
let (sow_offset, start_of_window_marker) = file_contents
.windows(14)
.enumerate()
.find(|(_, w)| HashSet::<&char>::from_iter(w.iter()).len() == 14)
.expect("Couldn't find start-of-message marker");
println!(
"Part 1: Start-of-packet message is {} at offset {}",
start_of_packet_marker
.into_iter()
.map(|c| c.to_string())
.collect::<Vec<String>>()
.join(""),
sop_offset + 4
);
println!(
"Part 2: Start-of-packet message is {} at offset {}",
start_of_window_marker
.into_iter()
.map(|c| c.to_string())
.collect::<Vec<String>>()
.join(""),
sow_offset + 14
);
Ok(())
}