{"header":{"message":"2021 day 1","description":null,"timestamp":"2021-12-03T03:08:40.196056Z","authors":[{"email":"quick.dudley@gmail.com","full_name":"Jeremy List","name":"quickdudley"}]},"hash":"HUHAFQLN6Q6U7CPR2SPPEPLE5LMCR53UA2GJ7LUVSHFXQPCGIYAQC","authors":[],"deps":{"hashes":[["HUHAFQLN6Q6U7CPR2SPPEPLE5LMCR53UA2GJ7LUVSHFXQPCGIYAQC","2021 day 1"],["AA",null],["B527MN663VOX7PY6BCLAAU62WDPTI4JTVLNUP2UR74S4KJYKT4HQC","Solve day 1 for 2020"]],"deps":["B527MN663VOX7PY6BCLAAU62WDPTI4JTVLNUP2UR74S4KJYKT4HQC"],"known":[]},"hunks":[{"FileAdd":{"meta":{"basename":"2021","metadata":576},"context":[{"change":1,"pos":0}],"contents":[]}},{"FileAdd":{"meta":{"basename":"day1.rs","metadata":0},"context":[{"change":0,"pos":16}],"contents":[{"Add":"enum PairsState {"},{"Add":" Fresh,"},{"Add":" Running(N),"},{"Add":" Finished,"},{"Add":"}"},{"Add":""},{"Add":"struct Pairs {"},{"Add":" inner: I,"},{"Add":" state: PairsState,"},{"Add":"}"},{"Add":""},{"Add":"impl, N> Pairs {"},{"Add":" fn new(inner: I) -> Self {"},{"Add":" Self {"},{"Add":" inner: inner,"},{"Add":" state: PairsState::Fresh,"},{"Add":" }"},{"Add":" }"},{"Add":"}"},{"Add":""},{"Add":"impl, N: Copy> Iterator for Pairs {"},{"Add":" type Item = (N, N);"},{"Add":""},{"Add":" fn next(&mut self) -> Option {"},{"Add":" match self.state {"},{"Add":" PairsState::Fresh => match self.inner.next() {"},{"Add":" None => {"},{"Add":" self.state = PairsState::Finished;"},{"Add":" None"},{"Add":" }"},{"Add":" Some(x) => {"},{"Add":" self.state = PairsState::Running(x);"},{"Add":" self.next()"},{"Add":" }"},{"Add":" },"},{"Add":" PairsState::Running(last) => match self.inner.next() {"},{"Add":" None => {"},{"Add":" self.state = PairsState::Finished;"},{"Add":" None"},{"Add":" }"},{"Add":" Some(x) => {"},{"Add":" self.state = PairsState::Running(x);"},{"Add":" Some((last, x))"},{"Add":" }"},{"Add":" },"},{"Add":" PairsState::Finished => None,"},{"Add":" }"},{"Add":" }"},{"Add":"}"},{"Add":""},{"Add":"struct SlidingWindow {"},{"Add":" inner: I,"},{"Add":" size: usize,"},{"Add":" window: std::collections::VecDeque,"},{"Add":"}"},{"Add":""},{"Add":"impl SlidingWindow {"},{"Add":" fn new(inner: I, size: usize) -> Self {"},{"Add":" Self {"},{"Add":" inner: inner,"},{"Add":" size: size,"},{"Add":" window: std::collections::VecDeque::new(),"},{"Add":" }"},{"Add":" }"},{"Add":"}"},{"Add":""},{"Add":"impl, N: Copy> Iterator for SlidingWindow {"},{"Add":" type Item = Vec;"},{"Add":""},{"Add":" fn next(&mut self) -> Option {"},{"Add":" match self.inner.next() {"},{"Add":" None => None,"},{"Add":" Some(x) => {"},{"Add":" self.window.push_back(x);"},{"Add":" if self.window.len() < self.size {"},{"Add":" self.next()"},{"Add":" } else {"},{"Add":" let result = self.window.iter().map(|x| *x).collect();"},{"Add":" self.window.pop_front();"},{"Add":" Some(result)"},{"Add":" }"},{"Add":" }"},{"Add":" }"},{"Add":" }"},{"Add":"}"},{"Add":""},{"Add":"fn count_increments, N: Copy + std::cmp::PartialOrd>(source: I) -> usize {"},{"Add":" Pairs::new(source)"},{"Add":" .map(|(last, current)| if current > last { 1 } else { 0 })"},{"Add":" .sum()"},{"Add":"}"},{"Add":""},{"Add":"fn main() {"},{"Add":" use std::fs::File;"},{"Add":" use std::io::BufRead;"},{"Add":" use std::io::BufReader;"},{"Add":" use std::path::Path;"},{"Add":" let args: Vec<_> = std::env::args().collect();"},{"Add":" let file = BufReader::new(File::open(>::as_ref(&args[1])).unwrap());"},{"Add":" let measurements: Vec = file"},{"Add":" .lines()"},{"Add":" .flat_map(|line| line.ok().and_then(|line| str::parse(line.as_ref()).ok()))"},{"Add":" .collect();"},{"Add":" println!("},{"Add":" \"Depth measurement increases {} times (measurements); {} times (moving window)\","},{"Add":" count_increments(measurements.iter()),"},{"Add":" count_increments("},{"Add":" SlidingWindow::new(measurements.iter(), 3).map(|w| w.into_iter().sum::())"},{"Add":" )"},{"Add":" 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std::collections::HashSet;"},{"Add":"use std::future::Future;"},{"Add":"use std::marker::Unpin;"},{"Add":"use std::stream::Stream;"},{"Add":"use tokio::io::{self, AsyncBufRead, AsyncBufReadExt, BufReader};"},{"Add":""},{"Add":"enum Rule {"},{"Add":" Match(String),"},{"Add":" Branch(Vec>),"},{"Add":"}"},{"Add":""},{"Add":"fn parse_rule(s: String) -> Option {"},{"Add":" let s = s.trim();"},{"Add":" s.split_once(':').and_then(|(_ix, body)| {"},{"Add":" let body = body.trim();"},{"Add":" parse_match_rule(body).or_else(|| parse_branch_rule(body))"},{"Add":" })"},{"Add":"}"},{"Add":""},{"Add":"fn parse_match_rule(body: &str) -> Option {"},{"Add":" let oqi = body.find('\\\"')?;"},{"Add":" let cqi = body.rfind('\\\"')?;"},{"Add":" Some(Rule::Match(String::from(&body[oqi + 1 .. cqi])))"},{"Add":"}"},{"Add":""},{"Add":"fn parse_branch_rule(body: &str) -> Option {"},{"Add":" use std::str::FromStr;"},{"Add":" let mut result = Vec::new();"},{"Add":" for a in body.split('|') {"},{"Add":" let mut branch = Vec::new();"},{"Add":" for b in a.split_whitespace() {"},{"Add":" branch.push(usize::from_str(b).ok()?);"},{"Add":" }"},{"Add":" result.push(branch);"},{"Add":" }"},{"Add":" Some(Rule::Branch(result))"},{"Add":"}"},{"Add":""},{"Add":"async fn read_rules(source: &mut I) -> Vec {"},{"Add":" let mut result = Vec::new();"},{"Add":" loop {"},{"Add":" let mut buf = String::new();"},{"Add":" match source.read_line(&mut buf).await {"},{"Add":" Ok(0) => break,"},{"Add":" Ok(_) => match parse_rule(buf) {"},{"Add":" None => break,"},{"Add":" Some(rule) => {"},{"Add":" result.push(rule);"},{"Add":" }"},{"Add":" },"},{"Add":" _ => break,"},{"Add":" }"},{"Add":" }"},{"Add":" result"},{"Add":"}"},{"Add":""},{"Add":"async fn check_match(rules: Vec, rule_index: usize, text: String) -> Option> {"},{"Add":" tokio::task::yield_now().await;"},{"Add":" match &rules[rule_index] {"},{"Add":" Rule::Match(lit) => text.strip_prefix(>::as_ref(lit)).map(|s| {"},{"Add":" let mut r = HashSet::with_capacity(1);"},{"Add":" r.insert(String::from(s));"},{"Add":" r"},{"Add":" }),"},{"Add":" Rule::Branch(branches) => {"},{"Add":" let jhs: Vec<_> = branches.iter().map(|branch| {"},{"Add":" let branch = branch.clone();"},{"Add":" let text = text.clone();"},{"Add":" tokio::spawn(async {"},{"Add":" tokio::task::yield_now().await;"},{"Add":" let mut remainders = HashSet::with_capacity(1);"},{"Add":" remainders.insert(text);"},{"Add":" for child in branch {"},{"Add":" let mut nr: HashSet = HashSet::new();"},{"Add":" for r in remainders {"},{"Add":" let recursive = Box::new(check_match(rules, child, r)) as Box>> + Unpin + Send>;"},{"Add":" for r2 in recursive.await.unwrap_or_else(|| HashSet::new()) {"},{"Add":" }"},{"Add":" }"},{"Add":" }"},{"Add":" Some(remainders)"},{"Add":" })"},{"Add":" }).collect();"},{"Add":" todo!()"},{"Add":" }"},{"Add":" }"},{"Add":"}"},{"Add":""},{"Add":"async fn write_str(sink: &mut S, text: String) -> io::Result {"},{"Add":" sink.write_buf(&mut Bytes::from(text)).await"},{"Add":"}"},{"Add":""},{"Add":"#[tokio::main(flavor = \"multi_thread\")]"},{"Add":"async fn main() -> io::Result<()> {"},{"Add":" let stdout = &mut io::stdout();"},{"Add":" let args: Vec<_> = std::env::args().collect();"},{"Add":" let mut input = BufReader::new(tokio::fs::File::open(args[1].clone()).await?);"},{"Add":" let rules = read_rules(&mut input).await;"},{"Add":" write_str(stdout, format!(\"rules.len() = {}\\n\", rules.len())).await?;"},{"Add":" Ok(())"},{"Add":"}"}]}},{"FileAdd":{"meta":{"basename":"Cargo.toml","metadata":0},"context":[{"change":2,"pos":17}],"contents":[{"Add":"[package]"},{"Add":"name = \"aoc-2020\""},{"Add":"version = \"0.1.0\""},{"Add":"edition = \"2018\""},{"Add":""},{"Add":"# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html"},{"Add":""},{"Add":"[dependencies]"},{"Add":"tokio = { version = \"1\", features = [\"full\"] }"},{"Add":"bytes = 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