day19
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e3f0f932e4
commit
d3c11dcbed
45
Cargo.lock
generated
45
Cargo.lock
generated
@ -11,11 +11,21 @@ dependencies = [
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"array2d",
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"itertools",
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"prev-iter",
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"regex",
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"rust-crypto",
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"strum",
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"strum_macros",
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]
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[[package]]
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name = "aho-corasick"
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version = "1.1.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "b2969dcb958b36655471fc61f7e416fa76033bdd4bfed0678d8fee1e2d07a1f0"
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dependencies = [
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"memchr",
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]
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[[package]]
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name = "aoc-runner"
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version = "0.3.0"
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@ -96,6 +106,12 @@ version = "0.2.151"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "302d7ab3130588088d277783b1e2d2e10c9e9e4a16dd9050e6ec93fb3e7048f4"
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[[package]]
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name = "memchr"
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version = "2.6.4"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f665ee40bc4a3c5590afb1e9677db74a508659dfd71e126420da8274909a0167"
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[[package]]
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name = "prev-iter"
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version = "0.1.2"
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@ -167,6 +183,35 @@ dependencies = [
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"rand_core 0.3.1",
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]
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[[package]]
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name = "regex"
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version = "1.10.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "380b951a9c5e80ddfd6136919eef32310721aa4aacd4889a8d39124b026ab343"
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dependencies = [
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"aho-corasick",
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"memchr",
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"regex-automata",
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"regex-syntax",
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]
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[[package]]
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name = "regex-automata"
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version = "0.4.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "5f804c7828047e88b2d32e2d7fe5a105da8ee3264f01902f796c8e067dc2483f"
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dependencies = [
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"aho-corasick",
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"memchr",
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"regex-syntax",
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]
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[[package]]
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name = "regex-syntax"
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version = "0.8.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "c08c74e62047bb2de4ff487b251e4a92e24f48745648451635cec7d591162d9f"
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[[package]]
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name = "rust-crypto"
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version = "0.2.36"
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@ -15,3 +15,4 @@ array2d = "0.3.0"
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strum = "0.25.0"
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strum_macros = "0.25"
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prev-iter = "0.1.2"
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regex = "1.10.2"
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245
src/day19.rs
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245
src/day19.rs
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@ -0,0 +1,245 @@
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use std::collections::HashMap;
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use regex::{Regex, Match};
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enum Rule {
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ACCEPTED,
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REJECTED,
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GOTO(String),
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GT(String, usize, String),
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LT(String, usize, String),
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}
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use aoc_runner_derive::{aoc, aoc_generator};
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#[aoc_generator(day19, part1)]
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fn parse(input: &str) -> (HashMap<String, Vec<Rule>>, Vec<HashMap<String, usize>>) {
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let (workflows_input, ratings_input) = input.split_once("\n\n").unwrap();
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let workflows = parse_workflows(workflows_input);
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// screw it im using regex
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let rer = Regex::new(r"^\{x=(\d+),m=(\d+),a=(\d+),s=(\d+)\}$").unwrap();
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let ratings: Vec<HashMap<String, usize>> = ratings_input.lines().map(|line| {
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let caps = rer.captures(line).unwrap();
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let x = parse_usize(caps.get(1));
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let m = parse_usize(caps.get(2));
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let a = parse_usize(caps.get(3));
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let s = parse_usize(caps.get(4));
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let mut vals = HashMap::new();
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vals.insert("x".to_string(), x);
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vals.insert("m".to_string(), m);
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vals.insert("a".to_string(), a);
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vals.insert("s".to_string(), s);
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vals
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}).collect();
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(workflows, ratings)
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}
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fn parse_usize(g: Option<Match>) -> usize {
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g.map_or(0, |m| m.as_str().parse().unwrap())
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}
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fn parse_workflows(workflows_input: &str) -> HashMap<String, Vec<Rule>> {
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let mut workflows: HashMap<String, Vec<Rule>> = HashMap::new();
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let rew = Regex::new(r"^(.+)\{(.+)\}$").unwrap();
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workflows_input.lines().for_each(|line| {
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let caps = rew.captures(line).unwrap();
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let key = caps.get(1).unwrap().as_str();
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let rules_str = caps.get(2).unwrap().as_str();
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let rules = rules_str.split(",").map(|expr| {
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if expr == "A" {
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return Rule::ACCEPTED;
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}
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if expr == "R" {
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return Rule::REJECTED;
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}
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if !expr.contains(":") {
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return Rule::GOTO(expr.to_string());
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}
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let (rule, to) = expr.split_once(":").unwrap();
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return if rule.contains(">") {
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let (prop, val) = rule.split_once(">").unwrap();
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Rule::GT(prop.to_string(), val.parse().unwrap(), to.to_string())
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} else if rule.contains("<") {
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let (prop, val) = rule.split_once("<").unwrap();
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Rule::LT(prop.to_string(), val.parse().unwrap(), to.to_string())
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} else {
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panic!("Unknown rule {}", rule)
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};
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}).collect();
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workflows.insert(key.to_string(), rules);
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});
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workflows
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}
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#[aoc(day19, part1)]
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fn part1((workflows, ratings): &(HashMap<String, Vec<Rule>>, Vec<HashMap<String, usize>>)) -> usize {
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let mut accepted: Vec<HashMap<String, usize>> = vec!();
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'outer: for rating in ratings {
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let mut wf_key = "in";
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'middle: loop {
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if wf_key == "A" {
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accepted.push(rating.clone());
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continue 'outer;
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} else if wf_key == "R" {
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continue 'outer;
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}
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let rules = workflows.get(wf_key).unwrap();
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for rule in rules {
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match rule {
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Rule::ACCEPTED => {
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accepted.push(rating.clone());
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continue 'outer;
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}
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Rule::REJECTED => {
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continue 'outer;
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}
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Rule::GOTO(new_wf_key) => {
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wf_key = new_wf_key;
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continue 'middle;
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}
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Rule::GT(prop, val, to) => {
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if rating.get(prop.as_str()).unwrap() > val {
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wf_key = to;
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continue 'middle;
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}
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}
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Rule::LT(prop, val, to) => {
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if rating.get(prop.as_str()).unwrap() < val {
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wf_key = to;
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continue 'middle;
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}
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}
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}
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}
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}
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}
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accepted.iter().map(|rating| rating.values().sum::<usize>()).sum::<usize>()
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}
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#[aoc_generator(day19, part2)]
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fn parse_part2(input: &str) -> HashMap<String, Vec<Rule>> {
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let (workflows_input, _) = input.split_once("\n\n").unwrap();
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parse_workflows(workflows_input)
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}
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#[aoc(day19, part2)]
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fn part2(workflows: &HashMap<String, Vec<Rule>>) -> usize {
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let mut stack: Vec<((usize, usize), (usize, usize), (usize, usize), (usize, usize), &str, usize)> =
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vec! {((1, 4000), (1, 4000), (1, 4000), (1, 4000), "in", 0)};
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let mut accepted: Vec<((usize, usize), (usize, usize), (usize, usize), (usize, usize))> = vec!();
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while let Some(range) = stack.pop() {
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let (x, m, a, s, wf_key, rule_key) = range;
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if wf_key == "A" {
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accepted.push((x, m, a, s));
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continue;
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} else if wf_key == "R" {
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continue;
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}
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if x.0 > x.1 || m.0 > m.1 || a.0 > a.1 || s.0 > s.1 { continue }
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let rules = workflows.get(wf_key).unwrap();
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let rule = &rules[rule_key];
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match rule {
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Rule::ACCEPTED => {
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accepted.push((x, m, a, s));
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continue;
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}
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Rule::REJECTED => {
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continue;
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}
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Rule::GOTO(new_wf_key) => {
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stack.push((x, m, a, s, new_wf_key, 0));
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continue;
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}
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Rule::GT(prop, val, to) => {
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match prop.as_str() {
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"x" => {
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stack.push(((val + 1, x.1), m, a, s, to.as_str(), 0));
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stack.push(((x.0, *val), m, a, s, wf_key, rule_key + 1));
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}
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"m" => {
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stack.push((x, (val + 1, m.1), a, s, to.as_str(), 0));
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stack.push((x, (m.0, *val), a, s, wf_key, rule_key + 1));
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}
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"a" => {
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stack.push((x, m, (val + 1, a.1), s, to.as_str(), 0));
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stack.push((x, m, (a.0, *val), s, wf_key, rule_key + 1));
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}
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"s" => {
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stack.push((x, m, a, (val + 1, s.1), to.as_str(), 0));
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stack.push((x, m, a, (s.0, *val), wf_key, rule_key + 1));
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}
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_ => { panic!("unknown prop {}", prop) }
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}
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}
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Rule::LT(prop, val, to) => {
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match prop.as_str() {
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"x" => {
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stack.push(((x.0, val - 1), m, a, s, to.as_str(), 0));
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stack.push(((*val, x.1), m, a, s, wf_key, rule_key + 1));
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}
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"m" => {
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stack.push((x, (m.0, val - 1), a, s, to.as_str(), 0));
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stack.push((x, (*val, m.1), a, s, wf_key, rule_key + 1));
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}
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"a" => {
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stack.push((x, m, (a.0, val - 1), s, to.as_str(), 0));
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stack.push((x, m, (*val, a.1), s, wf_key, rule_key + 1));
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}
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"s" => {
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stack.push((x, m, a, (s.0, val - 1), to.as_str(), 0));
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stack.push((x, m, a, (*val, s.1), wf_key, rule_key + 1));
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}
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_ => { panic!("unknown prop {}", prop) }
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}
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}
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}
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}
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accepted.iter().map(|(x, m, a, s)| {
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(x.1 - x.0 + 1) * (m.1 - m.0 + 1) * (a.1 - a.0 + 1) * (s.1 - s.0 + 1)
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}).sum()
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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const EX: &str = r"px{a<2006:qkq,m>2090:A,rfg}
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pv{a>1716:R,A}
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lnx{m>1548:A,A}
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rfg{s<537:gd,x>2440:R,A}
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qs{s>3448:A,lnx}
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qkq{x<1416:A,crn}
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crn{x>2662:A,R}
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in{s<1351:px,qqz}
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qqz{s>2770:qs,m<1801:hdj,R}
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gd{a>3333:R,R}
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hdj{m>838:A,pv}
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{x=787,m=2655,a=1222,s=2876}
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{x=1679,m=44,a=2067,s=496}
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{x=2036,m=264,a=79,s=2244}
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{x=2461,m=1339,a=466,s=291}
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{x=2127,m=1623,a=2188,s=1013}";
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#[test]
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fn part1_example() {
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assert_eq!(part1(&parse(EX)), 19114);
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}
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#[test]
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fn part2_example() {
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assert_eq!(part2(&parse_part2(EX)), 167409079868000);
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}
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}
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@ -1,3 +1,4 @@
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mod day19;
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mod day18;
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mod day17;
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mod day16;
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