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diff --git a/Cargo.lock b/Cargo.lock index 1fda254..8abf997 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -32,6 +32,7 @@ version = "0.1.0" dependencies = [ "aoc_proc", "color-eyre", + "peg", "petgraph", "regex", "time", @@ -281,6 +282,33 @@ version = "3.5.0" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "c1b04fb49957986fdce4d6ee7a65027d55d4b6d2265e5848bbb507b58ccfdb6f" +[[package]] +name = "peg" +version = "0.8.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "a07f2cafdc3babeebc087e499118343442b742cc7c31b4d054682cc598508554" +dependencies = [ + "peg-macros", + "peg-runtime", +] + +[[package]] +name = "peg-macros" +version = "0.8.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "4a90084dc05cf0428428e3d12399f39faad19b0909f64fb9170c9fdd6d9cd49b" +dependencies = [ + "peg-runtime", + "proc-macro2", + "quote", +] + +[[package]] +name = "peg-runtime" +version = "0.8.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "9fa00462b37ead6d11a82c9d568b26682d78e0477dc02d1966c013af80969739" + [[package]] name = "percent-encoding" version = "2.2.0" diff --git a/Cargo.toml b/Cargo.toml index aa7e239..5334162 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -15,3 +15,4 @@ ureq = "2.5.0" time = "0.3.17" regex = "1.7.0" petgraph = "0.6.2" +peg = "0.8.1" diff --git a/src/bin/day_13.rs b/src/bin/day_13.rs new file mode 100644 index 0000000..2875b45 --- /dev/null +++ b/src/bin/day_13.rs @@ -0,0 +1,148 @@ +use aoc_2022::prelude::*; + +peg::parser!{ + grammar packet_parser() for str { + rule number() -> usize + = n:$(['0'..='9']+) {? n.parse().or(Err("usize")) } + + rule packet_number() -> PacketEntry + = n:number() { PacketEntry::Integer(n) } + + rule packet_list() -> PacketEntry + = "[" l:(packet_item() ** ",") "]" { PacketEntry::List(l) } + + pub(super) rule packet_item() -> PacketEntry + = packet_list() / packet_number() + } +} + +#[derive(Clone, Debug)] +enum PacketEntry { + Integer(usize), + List(Vec), +} + +#[derive(Eq, PartialEq)] +enum CompareResult { + InOrder, + Equal, + OutOfOrder +} + +impl Into for CompareResult { + fn into(self) -> std::cmp::Ordering { + match self { + CompareResult::InOrder => std::cmp::Ordering::Less, + CompareResult::Equal => std::cmp::Ordering::Equal, + CompareResult::OutOfOrder => std::cmp::Ordering::Greater, + } + } +} + +impl PacketEntry { + /// Compares with self being first. + fn compare(&self, other: &PacketEntry) -> CompareResult { + match (self, other) { + (PacketEntry::Integer(v1), PacketEntry::Integer(v2)) => { + if v1 == v2 { + CompareResult::Equal + } else if v1 < v2 { + CompareResult::InOrder + } else { + CompareResult::OutOfOrder + } + }, + (PacketEntry::Integer(v), PacketEntry::List(_)) => { + PacketEntry::List(vec![PacketEntry::Integer(*v)]).compare(other) + }, + (PacketEntry::List(_), PacketEntry::Integer(v)) => { + self.compare(&PacketEntry::List(vec![PacketEntry::Integer(*v)])) + }, + (PacketEntry::List(l1), PacketEntry::List(l2)) => { + for (a, b) in l1.iter().zip(l2.iter()) { + match a.compare(b) { + CompareResult::InOrder => return CompareResult::InOrder, + CompareResult::Equal => continue, + CompareResult::OutOfOrder => return CompareResult::OutOfOrder, + } + } + + if l1.len() == l2.len() { + CompareResult::Equal + } else if l1.len() < l2.len() { + CompareResult::InOrder + } else { + CompareResult::OutOfOrder + } + }, + } + } +} + +type Input = Vec<(PacketEntry, PacketEntry)>; + +fn parse(s: &str) -> Result { + let mut pairs = vec![]; + + for pair in s.trim_end().split("\n\n") { + let (a, b) = pair.split_once("\n").unwrap(); + let a = packet_parser::packet_item(a)?; + let b = packet_parser::packet_item(b)?; + pairs.push((a, b)); + } + + Ok(pairs) +} + +#[aoc(day = 13, parse = parse, test_cases = ["day_13.txt"])] +fn day_13(input: Input) -> Result<()> { + // Part 1 + let result = input.iter().enumerate().filter_map(|(i, (left, right))| { + let result = left.compare(right); + if result == CompareResult::OutOfOrder { + None + } else { + Some(i + 1) + } + }).sum::(); + println!("Part one: {result}"); + + // Part 2 + let mut sorted = input.iter().flat_map(|(a, b)| [a.clone(), b.clone()].into_iter()) + .collect::>(); + + // add extra packets + for i in [2, 6] { + sorted.push(PacketEntry::List(vec![PacketEntry::List(vec![PacketEntry::Integer(i)])])); + } + + sorted.sort_by(|a, b| a.compare(b).into()); + + let mut result = 1; + for (i, item) in sorted.iter().enumerate() { + match item { + PacketEntry::List(l) => { + if l.len() == 1 { + match &l[0] { + PacketEntry::List(l) => { + if l.len() == 1 { + match l[0] { + PacketEntry::Integer(2) | PacketEntry::Integer(6) => { + result *= i + 1; + }, + _ => {} + } + } + } + _ => {} + } + } + } + _ => {}, + } + } + + println!("Part two: {result}"); + + Ok(()) +} diff --git a/test_cases/day_13.txt b/test_cases/day_13.txt new file mode 100644 index 0000000..27c8912 --- /dev/null +++ b/test_cases/day_13.txt @@ -0,0 +1,23 @@ +[1,1,3,1,1] +[1,1,5,1,1] + +[[1],[2,3,4]] +[[1],4] + +[9] +[[8,7,6]] + +[[4,4],4,4] +[[4,4],4,4,4] + +[7,7,7,7] +[7,7,7] + +[] +[3] + +[[[]]] +[[]] + +[1,[2,[3,[4,[5,6,7]]]],8,9] +[1,[2,[3,[4,[5,6,0]]]],8,9] \ No newline at end of file