day 13

4 files changed, 585 insertions, 0 deletions

diff --git a/benches/2022.rs b/benches/2022.rs
index 4838721..a94f8bb 100644
--- a/benches/2022.rs
+++ b/benches/2022.rs
@@ -25,6 +25,8 @@ mod day7;
 mod day8;
 #[path = "../src/bin/2022/day9.rs"]
 mod day9;
+#[path = "../src/bin/2022/day13.rs"]
+mod day13;
 // NEXT MOD
 
 day!(2022, 1, day1);
@@ -39,6 +41,7 @@ day!(2022, 9, day9);
 day!(2022, 10, day10);
 day!(2022, 11, day11);
 day!(2022, 12, day12);
+day!(2022, 13, day13);
 // NEXT DAY
 
 fn bench_2022(c: &mut criterion::Criterion) {
@@ -56,6 +59,7 @@ fn bench_2022(c: &mut criterion::Criterion) {
             day_combined!(2022, 10, day10);
             day_combined!(2022, 11, day11);
             day_combined!(2022, 12, day12);
+            day_combined!(2022, 13, day13);
             // NEXT DAY COMBINED
         })
     });
@@ -76,5 +80,6 @@ criterion::criterion_main!(
     bench_2022day10,
     bench_2022day11,
     bench_2022day12,
+    bench_2022day13,
     // NEXT GROUP
 );
diff --git a/data/2022/13.txt b/data/2022/13.txt
new file mode 100644
index 0000000..808ab84
--- /dev/null
+++ b/data/2022/13.txt
@@ -0,0 +1,449 @@
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+
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+[[0]]
+
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+
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+
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+
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+[[[10,7,[8,10,2,0,6]],6,[8,4,[8]],1,5],[8,[1,6],3]]
+
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+[[],[3]]
+
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+
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+[[[1,6,[10,4,2]],1],[1,[4,[2,7],6,[7],2]],[3,9,10,9],[]]
+
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+[[[2,5]],[[5,[8,7,2,0],8,[9,1,5],[9,8,0]],10,10,[9,3,[10]],3],[[2,2,7,[3,10,7,10,8],7],8],[4,0,[6,2,10],[10,3,0,[4,6,5,4,2]]]]
+
+[[[],2],[0,6,[[2,7,7,2,4],[7,1]],6,2]]
+[[3,[],[[10,2,1,5]]],[]]
+
+[[],[8,[[5,10,5]],9]]
+[[[[2,8,4],[2,0],4,6,4],2,[[10,5,10],1,[10,9,1,1]]],[2,7],[],[[[3,1,4,8,4],4,[0,5,9,3],4,[]],[],[8,2]]]
diff --git a/src/bin/2022/day13.rs b/src/bin/2022/day13.rs
new file mode 100644
index 0000000..d8d24d2
--- /dev/null
+++ b/src/bin/2022/day13.rs
@@ -0,0 +1,129 @@
+#![allow(dead_code)]
+#![allow(unused_variables)]
+
+use advent_of_code::prelude::*;
+
+#[derive(PartialEq, Eq, Clone, Debug)]
+pub enum Packet {
+    Int(usize),
+    List(Vec<Packet>),
+}
+
+impl PartialOrd for Packet {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl Ord for Packet {
+    fn cmp(&self, other: &Self) -> Ordering {
+        match self {
+            Self::Int(left) => match other {
+                Self::Int(right) => left.cmp(right),
+                Self::List(right) => {
+                    Self::List(vec![self.clone()]).cmp(other)
+                }
+            },
+            Self::List(left) => match other {
+                Self::Int(right) => {
+                    self.cmp(&Self::List(vec![other.clone()]))
+                }
+                Self::List(right) => left.cmp(right),
+            },
+        }
+    }
+}
+
+impl Packet {
+    fn parse(s: &str) -> Result<(Self, &str)> {
+        if let Some(mut s) = s.strip_prefix('[') {
+            let mut l = vec![];
+            while !s.starts_with([',', ']']) {
+                let (packet, next) = Self::parse(s)?;
+                l.push(packet);
+                match next.as_bytes()[0] {
+                    b',' => s = &next[1..],
+                    b']' => {
+                        s = next;
+                        break;
+                    }
+                    _ => bail!("failed to parse"),
+                }
+            }
+            Ok((Self::List(l), &s[1..]))
+        } else {
+            let end = s.find([',', ']']).unwrap_or(s.len());
+            Ok((Self::Int(s[..end].parse()?), &s[end..]))
+        }
+    }
+}
+
+impl std::str::FromStr for Packet {
+    type Err = anyhow::Error;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let (packet, rest) = Packet::parse(s)?;
+        if !rest.is_empty() {
+            bail!("trailing data: '{}'", rest);
+        }
+        Ok(packet)
+    }
+}
+
+pub fn parse(fh: File) -> Result<Vec<(Packet, Packet)>> {
+    let mut lines = parse::raw_lines(fh);
+
+    let mut pairs = vec![];
+    loop {
+        let packet1 = lines.next().unwrap();
+        let packet2 = lines.next().unwrap();
+        pairs.push((packet1.parse()?, packet2.parse()?));
+        if let Some(line) = lines.next() {
+            assert_eq!(line, "");
+        } else {
+            break;
+        }
+    }
+    Ok(pairs)
+}
+
+pub fn part1(pairs: Vec<(Packet, Packet)>) -> Result<usize> {
+    let mut total = 0;
+    for (i, (left, right)) in pairs.iter().enumerate() {
+        if left <= right {
+            total += i + 1;
+        }
+    }
+    Ok(total)
+}
+
+pub fn part2(pairs: Vec<(Packet, Packet)>) -> Result<usize> {
+    let div_a = Packet::List(vec![Packet::List(vec![Packet::Int(2)])]);
+    let div_b = Packet::List(vec![Packet::List(vec![Packet::Int(6)])]);
+    let mut packets: Vec<Packet> = pairs
+        .into_iter()
+        .flat_map(|(left, right)| {
+            std::iter::once(left).chain(std::iter::once(right))
+        })
+        .chain(std::iter::once(div_a.clone()))
+        .chain(std::iter::once(div_b.clone()))
+        .collect();
+    packets.sort_unstable();
+    let idx_a =
+        packets.iter().position(|packet| packet == &div_a).unwrap() + 1;
+    let idx_b =
+        packets.iter().position(|packet| packet == &div_b).unwrap() + 1;
+    Ok(idx_a * idx_b)
+}
+
+#[test]
+fn test() {
+    assert_eq!(
+        part1(parse(parse::data(2022, 13).unwrap()).unwrap()).unwrap(),
+        6070
+    );
+    assert_eq!(
+        part2(parse(parse::data(2022, 13).unwrap()).unwrap()).unwrap(),
+        20758
+    );
+}
diff --git a/src/bin/2022/main.rs b/src/bin/2022/main.rs
index c694d56..90221d9 100644
--- a/src/bin/2022/main.rs
+++ b/src/bin/2022/main.rs
@@ -23,6 +23,7 @@ mod day7;
 mod day8;
 mod day9;
 mod day12;
+mod day13;
 // NEXT MOD
 
 #[paw::main]
@@ -41,6 +42,7 @@ fn main(opt: Opt) -> Result<()> {
         10 => advent_of_code::day!(2022, opt.day, opt.puzzle, day10),
         11 => advent_of_code::day!(2022, opt.day, opt.puzzle, day11),
         12 => advent_of_code::day!(2022, opt.day, opt.puzzle, day12),
+        13 => advent_of_code::day!(2022, opt.day, opt.puzzle, day13),
         // NEXT PART
         _ => panic!("unknown day {}", opt.day),
     }