complete day 13

10 files changed, 1455 insertions, 2 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 9e1997f..aff08f7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -268,6 +268,24 @@ dependencies = [
 ]
 
 [[package]]
+name = "day13a"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "itertools",
+ "nom",
+]
+
+[[package]]
+name = "day13b"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "itertools",
+ "nom",
+]
+
+[[package]]
 name = "either"
 version = "1.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
diff --git a/Cargo.toml b/Cargo.toml
index e91aa7e..c315226 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -25,8 +25,8 @@ members = [
     "day11b",
     "day12a",
     "day12b",
-    # "day13a",
-    # "day13b",
+    "day13a",
+    "day13b",
     # "day14a",
     # "day14b",
     # "day15a",
diff --git a/day13a/Cargo.toml b/day13a/Cargo.toml
new file mode 100644
index 0000000..4ce2d57
--- /dev/null
+++ b/day13a/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "day13a"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+clap = { version = "3.2.20", features = ["derive"] }
+nom = "7.1.1"
+itertools = "0.10.5"
diff --git a/day13a/examples/input.txt b/day13a/examples/input.txt
new file mode 100644
index 0000000..758aa63
--- /dev/null
+++ b/day13a/examples/input.txt
@@ -0,0 +1,449 @@
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+
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+
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+
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+[[[[9,1],[8],[2,6],[10,4,1],[2]]],[10,0,9,[0,[9,2,5,3],7,4,1]],[7,[[1,1,4,1,2],[10,5,6,9,6],[6,9],6,3],[]]]
+
+[[2,[[4,7,2,8,9],5,4,2,[2]],[[7],[5,6],3,[]]],[9,6,6,[2,2,8,[],[0,3,6,4]],[6,2,8]],[[[2,1],2,[8],[0,5,7,9,10],10],0,[],1,[6,3,10,3,[]]],[[1,9,9],[[10,3,7]],3,[4,[6,3,1],[],[9],6]]]
+[[3,2],[],[[],0,[[2,3,9,4],9,[6,6,1]],[[10,5,1,4],4,2,[5]]],[[[1,0,4],[5,4,4,1,2],[1,6],[4,5],[]],[[0,6,3]],[5]],[]]
+
+[[6],[],[0,[7],[],8,0]]
+[[],[[8,[8,0,0,4],9,7,2],[[2],[9],[1,8,5,0],[5,5,7,3]]],[9],[[],[9,10,[5,5,4,7],[5,1,2,0,5]],[[1,0],10,[5,10,1],9],0]]
+
+[[8,[[3,0,2,2,7],7,7,[0,3,0]]],[[[0,3,4],[9,7,0,4,1],9],[[3,10,10,4]],8,8]]
+[[3],[4,6,6,10,[]],[[[7,1,5,10],[5],[10,3],5],6]]
+
+[[10,8,[[3,6,9],10,0],7,2],[[],[]],[6,[[]],[]]]
+[[[[9,10],7,4,0,[6]]],[5]]
+
+[[1,[]]]
+[[[2,8],7,[[10,4],10,[]]],[[[],[2,1],[10,6,2,7],[9]],[[],3,[],[6,4,3,6,3]],[0,[4,8,3,0,5]],8,3],[2,[[5,10,5,0],[6,4,8,4],3,[3,10,5,3],[6,5,3,8,7]],[[10,8,9]]]]
+
+[[[[],9],2,2,8],[3,[[],[10,1,1,4,2],[0,7,3]],8],[[],[4]],[[[]],9,4,[5,[3,5,4,4],[],8]],[]]
+[[6,[8,3,[7],[9,6]]]]
+
+[[[[],7],9,[],1,[[],10,2,9]],[[[8,1,6,6],0],2,5,5,[[8,6,5,3],1,6,4,0]],[[8],10,[],2],[[10,2,7,5,[10,3]],[[10,10],7]],[7]]
+[[10],[5,[1,[0,10,4,4,6],2,[3],7],9],[8,4,6,2]]
+
+[[],[[3,6],[],0,[0,[1],[4,10],4],[[7]]],[8,[[2,8]],[[5,3,6,7]]]]
+[[[8,[1,1,6,7,1]],[],4],[[6,[],[6,7],[5],[5]]],[[[],0],5],[6,10,6,[]]]
+
+[[[],[5,[9],[10,4],[1],7]],[1,[2,[10,1,9,0,6],5]],[[[2]],[],[[8,1,9,8,8],8,[],6,8]],[[[6,3,6,4,2],1,[4,6,6,10,9],8,[9,7,7,10]],10],[2]]
+[[4],[[],7,9,[[0,8,1,2],[9,8],0,[5],8]],[[8,[9,6],3,[5,6]]],[6,[5,[9,10,4,7],4],[],2,6],[[],8,[[7,7]],[6,0,[8]]]]
+
+[[9],[1,[],2,[[],5,[7,9,2,1],[7],[]],3],[0,[],[[5,1,2,0],0,[10,9,10,6,10],[8,1],5]],[7,[[3,8,9,10],[0,2]],[2,0],9,[[1,3,9,3,9],[6,6,3],[]]],[4]]
+[[[6,3,7],9,[[1,3,5,8,10],1,[6,10,10,9],3,[1,7]]]]
+
+[[],[[],5]]
+[[8],[7,2,10]]
+
+[[6,[4,[3],[],[1,7,4,2,5],[3,10,10]],8,[],[9,8,[]]],[[0,0,3],[5,[5,2,5],4,[5,1,2,8,6],9],4],[[]]]
+[[1,10],[4],[[0],3,[[8],5,[2,6,10,3]]]]
+
+[[],[8,5,9],[[[5],[3]],7,4,4],[8]]
+[[],[]]
+
+[[8,[],0]]
+[[4,4,6],[9,5,[[3,8,4,5],5],9,[[5,3],[0,4,0,3],3,[4,10],7]]]
+
+[[[[6,2,3,9,9],[4,1],10,[],3],[4,1,[8,5,5,8],[6,7,2],[4]]],[[[10,4,2,10,9],[2],[2,4,6],3],[[0,8,10],[4],[0,7,0,9,0]],[3]],[4,7,3,8]]
+[[[6,5,0],9,5,7,2],[[[],[],7,3,0]],[[7],[],4],[1,6,6,[],9]]
diff --git a/day13a/examples/test.txt b/day13a/examples/test.txt
new file mode 100644
index 0000000..af73fbb
--- /dev/null
+++ b/day13a/examples/test.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]
diff --git a/day13a/src/main.rs b/day13a/src/main.rs
new file mode 100644
index 0000000..204d674
--- /dev/null
+++ b/day13a/src/main.rs
@@ -0,0 +1,270 @@
+#![feature(iter_array_chunks)]
+
+/// --- Day 13: Distress Signal ---
+///
+/// You climb the hill and again try contacting the Elves.  However, you instead receive a signal
+/// you weren't expecting: a distress signal.
+///
+/// Your handheld device must still not be working properly; the packets from the distress signal
+/// got decoded out of order.  You'll need to re-order the list of received packets (your puzzle
+/// input) to decode the message.
+///
+/// Your list consists of pairs of packets; pairs are separated by a blank line.  You need to
+/// identify how many pairs of packets are in the right order.
+///
+/// For example:
+///
+/// ```
+/// [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]
+/// ```
+///
+/// Packet data consists of lists and integers.  Each list starts with [, ends with ], and contains
+/// zero or more comma-separated values (either integers or other lists).  Each packet is always a
+/// list and appears on its own line.
+///
+/// When comparing two values, the first value is called left and the second value is called right.
+/// Then:
+///
+///     If both values are integers, the lower integer should come first.  If the left integer is
+///     lower than the right integer, the inputs are in the right order.  If the left integer is
+///     higher than the right integer, the inputs are not in the right order.  Otherwise, the
+///     inputs are the same integer; continue checking the next part of the input.
+///     If both values are lists, compare the first value of each list, then the second value, and
+///     so on.  If the left list runs out of items first, the inputs are in the right order.  If
+///     the right list runs out of items first, the inputs are not in the right order.  If the
+///     lists are the same length and no comparison makes a decision about the order, continue
+///     checking the next part of the input.
+///     If exactly one value is an integer, convert the integer to a list which contains that
+///     integer as its only value, then retry the comparison.  For example, if comparing [0,0,0]
+///     and 2, convert the right value to [2] (a list containing 2); the result is then found by
+///     instead comparing [0,0,0] and [2].
+///
+/// Using these rules, you can determine which of the pairs in the example are in the right order:
+///
+/// ```
+/// == Pair 1 ==
+/// - Compare [1,1,3,1,1] vs [1,1,5,1,1]
+///   - Compare 1 vs 1
+///   - Compare 1 vs 1
+///   - Compare 3 vs 5
+///     - Left side is smaller, so inputs are in the right order
+///
+/// == Pair 2 ==
+/// - Compare [[1],[2,3,4]] vs [[1],4]
+///   - Compare [1] vs [1]
+///     - Compare 1 vs 1
+///   - Compare [2,3,4] vs 4
+///     - Mixed types; convert right to [4] and retry comparison
+///     - Compare [2,3,4] vs [4]
+///       - Compare 2 vs 4
+///         - Left side is smaller, so inputs are in the right order
+///
+/// == Pair 3 ==
+/// - Compare [9] vs [[8,7,6]]
+///   - Compare 9 vs [8,7,6]
+///     - Mixed types; convert left to [9] and retry comparison
+///     - Compare [9] vs [8,7,6]
+///       - Compare 9 vs 8
+///         - Right side is smaller, so inputs are not in the right order
+///
+/// == Pair 4 ==
+/// - Compare [[4,4],4,4] vs [[4,4],4,4,4]
+///   - Compare [4,4] vs [4,4]
+///     - Compare 4 vs 4
+///     - Compare 4 vs 4
+///   - Compare 4 vs 4
+///   - Compare 4 vs 4
+///   - Left side ran out of items, so inputs are in the right order
+///
+/// == Pair 5 ==
+/// - Compare [7,7,7,7] vs [7,7,7]
+///   - Compare 7 vs 7
+///   - Compare 7 vs 7
+///   - Compare 7 vs 7
+///   - Right side ran out of items, so inputs are not in the right order
+///
+/// == Pair 6 ==
+/// - Compare [] vs [3]
+///   - Left side ran out of items, so inputs are in the right order
+///
+/// == Pair 7 ==
+/// - Compare [[[]]] vs [[]]
+///   - Compare [[]] vs []
+///     - Right side ran out of items, so inputs are not in the right order
+///
+/// == Pair 8 ==
+/// - Compare [1,[2,[3,[4,[5,6,7]]]],8,9] vs [1,[2,[3,[4,[5,6,0]]]],8,9]
+///   - Compare 1 vs 1
+///   - Compare [2,[3,[4,[5,6,7]]]] vs [2,[3,[4,[5,6,0]]]]
+///     - Compare 2 vs 2
+///     - Compare [3,[4,[5,6,7]]] vs [3,[4,[5,6,0]]]
+///       - Compare 3 vs 3
+///       - Compare [4,[5,6,7]] vs [4,[5,6,0]]
+///         - Compare 4 vs 4
+///         - Compare [5,6,7] vs [5,6,0]
+///           - Compare 5 vs 5
+///           - Compare 6 vs 6
+///           - Compare 7 vs 0
+///             - Right side is smaller, so inputs are not in the right order
+/// ```
+///
+/// What are the indices of the pairs that are already in the right order? (The first pair has
+/// index 1, the second pair has index 2, and so on.) In the above example, the pairs in the right
+/// order are 1, 2, 4, and 6; the sum of these indices is 13.
+///
+/// Determine which pairs of packets are already in the right order.  What is the sum of the
+/// indices of those pairs?
+use clap::Parser;
+use itertools::Itertools;
+use nom::branch::alt;
+use nom::bytes::complete::tag;
+use nom::character::complete::i8;
+use nom::combinator::{map, opt};
+use nom::error::{ContextError, ErrorKind as NomErrorKind, ParseError};
+use nom::multi::many1;
+use nom::sequence::{delimited, terminated};
+use nom::IResult;
+
+use std::fs::File;
+use std::io::prelude::*;
+use std::io::BufReader;
+use std::path::PathBuf;
+
+const FILEPATH: &'static str = "examples/input.txt";
+
+pub type Input<'a> = &'a str;
+pub type Result<'a, T> = IResult<Input<'a>, T, Error<Input<'a>>>;
+
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub enum ErrorKind {
+    Nom(NomErrorKind),
+    Context(&'static str),
+    Custom(String),
+}
+
+#[derive(Parser, Debug)]
+#[clap(author, version, about, long_about = None)]
+struct Cli {
+    #[clap(short, long, default_value = FILEPATH)]
+    file: PathBuf,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct Error<I> {
+    pub errors: Vec<(I, ErrorKind)>,
+}
+
+#[derive(Clone, Debug)]
+enum ListEntry {
+    Value(Option<i8>),
+    List(Vec<ListEntry>),
+}
+
+impl<I> ParseError<I> for Error<I> {
+    fn from_error_kind(input: I, kind: NomErrorKind) -> Self {
+        let errors = vec![(input, ErrorKind::Nom(kind))];
+        Self { errors }
+    }
+
+    fn append(input: I, kind: NomErrorKind, mut other: Self) -> Self {
+        other.errors.push((input, ErrorKind::Nom(kind)));
+        other
+    }
+}
+
+impl<I> ContextError<I> for Error<I> {
+    fn add_context(input: I, ctx: &'static str, mut other: Self) -> Self {
+        other.errors.push((input, ErrorKind::Context(ctx)));
+        other
+    }
+}
+
+fn parse_list(input: &str) -> Result<ListEntry> {
+    alt((
+        map(i8, |v| ListEntry::Value(Some(v))),
+        map(tag("[]"), |_| ListEntry::Value(None)),
+        delimited(
+            tag("["),
+            map(many1(terminated(parse_list, opt(tag(",")))), |list| {
+                ListEntry::List(list)
+            }),
+            tag("]"),
+        ),
+    ))(input)
+}
+
+fn compare(lhs: &ListEntry, rhs: &ListEntry) -> Option<bool> {
+    use ListEntry::*;
+    match (lhs, rhs) {
+        (Value(lv), Value(rv)) => {
+            if lv == rv {
+                None
+            } else {
+                Some(lv < rv)
+            }
+        }
+        (Value(None), List(_)) => Some(true),
+        (Value(_), List(_)) => compare(&ListEntry::List(vec![lhs.clone()]), rhs),
+        (List(_), Value(None)) => Some(false),
+        (List(_), Value(_)) => compare(lhs, &ListEntry::List(vec![rhs.clone()])),
+        (List(lv), List(rv)) => lv
+            .iter()
+            .zip_longest(rv.iter())
+            .find_map(|pair| match pair {
+                itertools::EitherOrBoth::Both(l, r) => compare(l, r),
+                itertools::EitherOrBoth::Right(_) => Some(true),
+                itertools::EitherOrBoth::Left(_) => Some(false),
+            }),
+    }
+}
+
+fn main() {
+    let args = Cli::parse();
+
+    let file = File::open(&args.file).unwrap();
+    let reader = BufReader::new(file);
+
+    let res: i32 = reader
+        .lines()
+        .filter_map(|line| {
+            let s = line.unwrap();
+            if s.is_empty() {
+                return None;
+            }
+            Some(parse_list(s.as_str()).unwrap().1)
+        })
+        .array_chunks::<2>()
+        .zip(1..)
+        .filter_map(|(chunk, idx)| {
+            if compare(&chunk[0], &chunk[1]).unwrap() {
+                Some(idx)
+            } else {
+                None
+            }
+        })
+        .sum();
+
+    println!("{res}");
+}
diff --git a/day13b/Cargo.toml b/day13b/Cargo.toml
new file mode 100644
index 0000000..c3bc83c
--- /dev/null
+++ b/day13b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "day13b"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+clap = { version = "3.2.20", features = ["derive"] }
+nom = "7.1.1"
+itertools = "0.10.5"
diff --git a/day13b/examples/input.txt b/day13b/examples/input.txt
new file mode 100644
index 0000000..758aa63
--- /dev/null
+++ b/day13b/examples/input.txt
@@ -0,0 +1,449 @@
+[[4,[1,[]]],[8,3,[[0,2],[5,2,6],[7,0,10,0],2,[5,7,10,2]],[[5,9],5,10,[9,7,7]]]]
+[[[],9],[[[3,2,6,3],[7,8]],10],[1]]
+
+[[],[0,4,[[2,9,0,1,2],[1,1,1,1],9,[2]]],[[],5]]
+[[[[4,6],[9,4,9,5],7,[1,3,6],[]]],[1,[]],[8,[6,[8],0,5],[],[[7,4,9],[4,2,8,2,2],[10,5,5,4],4]],[8,[7,[7,3],[4],10],[10],[[10,1]]],[]]
+
+[[0],[[[1],0,[],2,[4,5,6,3,2]],5,[],3],[[0,[8,8,5,2],10,[7,6,4,8],[4,9,3,9,5]],9,[4,6]],[[10,6,[10,2],8,[]],[10,[10,8,10,1,4],[0,6],4],8,[6,[5,3,3],6,[3,9,4,0],7]],[[4,8],[1,3,9],[[2],6],5,[0,[5,0],0,5]]]
+[[[[10,8],[3,6,7],3,[4]],[[8,10,8,4,0],[7,2],7,[2],[1,3]],3,[[0,7,9,1,10],[8,1,6]]]]
+
+[[[1,[5,2,6,6,0]],[[7,7],[]],[[4,5],[],[],[3,7,1,8],1]],[9,[[],[8,7,8,9]],[2,4,0,[7,4,4]],[1],[]],[[[],[4,7,0,4],[1,0]],5,4],[],[[9,[],[7]]]]
+[[[3],[[5,2,1]],2]]
+
+[[[[5,8,8,6],0]]]
+[[[[3,0,10,1,5],10,[7,0]],8,[0,9,4,[8,10]],[[6],[4,4,8],7,9,[9]]],[[7,[],0,2],[[]],5,6,[]],[0,[[1,10,8,8,1],2,[2,6],[10,9],[7]]],[2],[[[],2,5,[2,9,6,0],8],9]]
+
+[[],[6],[[0,[2],8,[]],[[0],9,5,[7,6,6,6,9],[3,1]],4,10],[[4,[5,1,9,4],2]]]
+[[[],[[3,7,5,4,1],[9,0,2,5,6],[4,3],2,[0,1,2,7,2]],[]],[[],2,5,3],[[2,9],1,10,0,1],[[4,9],[],[6,[],7,10,[10,9,1,10,9]],1,7]]
+
+[[10],[],[6,[],[]],[],[2,0,5]]
+[[6,1,[8,6,9]]]
+
+[[8,[[0,0],[],1,[8],8],4,[7,8,1,10],10],[]]
+[[[0],6],[[],3]]
+
+[[[8,[5],[4],[2,0]],[[1],1,[4,2,10,6]]],[[],[6,5,[6],[9,2,3]],[[6]]]]
+[[[6,2,4,[4,9],[2,4,10]]],[[3,[5,5,10,9,9],10,[6,2,8,7,9]],[],4],[[[3,2],[]]],[[[10,9],[3,10]],[0,1]]]
+
+[[[[8,10,1],10]],[7],[[9,[7],[0,9,8,4]]],[[4],4,0]]
+[[1,[],[[9,9,2],[10],[]]],[[[7],[],[],[],4],[[3],0,[5,7,1],6],3,10],[2]]
+
+[[10],[],[]]
+[[2,4,2,[[6],[1,10],4,9],3],[7,8,5],[[],0],[[5,[],[]],7]]
+
+[[5,3,[[7,6,10],10,7,[6,5,7,9],8],[],4],[0,[[6],[2,2,1,5,7],[1],[2],1],[2],[1,[7,1,3,0,3],[9],7,[1,9,6]]]]
+[[[4,[5,9,6,5,6],1,[6,4,4,4,9]],[[],6,[8,3],[2,1],9]],[6,[[10,1]],[7,[6,1]],[[6,3,8,2],8]],[2,7,[],7],[0,7,[[6],9,[4,10,6,6,4]],[]],[7,4,[8,[1,6,8,7]],9]]
+
+[[8],[[1,0,2,10,3],5],[],[9,[[1],[3,6,6,6,8],2,5,8],10,9,[3]],[4,6,1,[8]]]
+[[3,4],[[],[7,[1,10],[9,9,7,5,2],5]],[],[[0,[4,7],[2,7,3,8],3],[3],[[],[],9,[2,7,9]],[8,2,6]],[9,[]]]
+
+[[[[2,0,1],6,[1],7]],[7,10,2],[],[[]],[2,1,[[],9],[[6,9,9,6,0],[],[10,2]]]]
+[[4,[],6,5],[[],[[],[5,2]],[1,4],0,[[5],[9,9,4,1,5]]],[[],10,10,[8],[1,[8],2,9,2]],[7,3,[[0,8,5,2],[4,2,10],0]],[1,[[1,9,5],3,10,[10,8]],9,[[]]]]
+
+[[5,7,8,9],[6,9,[5],0,[7,[4],[9,7,1,1],7,6]],[[[8,2,9,6]],[8,5,[4,1,0]],[[2,6,3],[2],[4,0],[2,0,5]],6,[[9,6,7,4],[4],4,8,[9]]]]
+[[[8,3,[3],[7,5,10]],3,[5],9,0],[3],[[[9,6,0]],1],[3,10,[[9,8,6,10],4,[10,10],[10],[2,7]],2,10],[5]]
+
+[[],[4,[[7]],[[3,10],[5]]]]
+[[[[0,5,7],0,10],[[],2,8,3],1,[5,8]],[]]
+
+[[[],[[4,5],9,8,[4,2,7],[1,6]],[[]],1,[[1,10,9,10,4],2,4]],[8,[0,7,2,[3,8,4,9]],[[5,9,3],1]],[[[4],10,[5]],4],[5,[4,9,[]],1,1,8]]
+[[4],[1],[],[[[3,2,1,5,6]],[[4],[2,1,3]],[10,5]]]
+
+[[0,6],[],[[],7,9,5],[]]
+[[[5,[2,5,0,8,10],5,[10,8,10,7]],5,6],[[7,[]],10]]
+
+[[[[7,0,7],[8,4,10,2,6],[10,8,9],[10,3]],[[1,9,5,0],2,[1,8,1,8,2]]],[[[],[9,3],10,[1],9],[[9,9,6]],1,[0],9]]
+[[[[5,1,9,10,6],7]],[10,[4],[7],0],[1,8,[[],4,[10]],[[6,8,4,2],6,[],[10,8]]]]
+
+[[10,[[6,7,7],[5,5,1,4]],[1,0,0,7,[1,8,2]]],[4],[9],[[5],[10,[2,5,10]],5,[]]]
+[[8],[4,5],[6,[[9,1,5],[2,10,3,7,7],9]],[9,0,0,[],[0,[7,3],3]]]
+
+[[],[[[4,7,9,6]],2,10,[6]],[[[3,3,10,5],[2,6,1,5,2],[3],[],8],2,7],[6,9,[0,8,9,10,8]]]
+[[[4,0,[5]],0,[[],[1,6,5,5,5],[5,2,7,5],2],3,[9,[9,3,9,7,4]]],[8,[],[[1,1]],[[4,8,1],[7,6,8,8],[],10]],[4,[[6,6,3,10,2],[8,1,1,1,7]],[[3],9,[4,3,9,1,7]]],[[1,[8,6,3,1],[2,10,9]]]]
+
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+[[[[1,8,6],[4,1,6,4],8,[7,7,8],3],[[2,1,1,8],0,10,7,[]]]]
+[[[[9,10,7,1],8,0]],[[]],[4,[2,0,[4,2,10,8,0]],[],[[10,9,10,7],5,5,1,0]]]
+
+[[4,7,7],[],[[0,[10,7,3,8],8,[10,0]]],[[9],0]]
+[[[2,[9,7],[4,2,8,5]]],[[[6,7,4],2,1,[4,1,8],[6,10]],[[4,10,6],[6,2]],[],6,[4]],[[3,1],[[5,10],3],[0]]]
+
+[[[[7,0],1,[0,10,4,0],[8]],0],[],[2],[10,[[0],[10,1,0,4,1],5,10,4],9,7]]
+[[[[]],[[],[7],[],[5,5,5],[8,7,1]],3],[[[9],[],3,4,[7,5,2]],[0,[7,8,0,4,8],[2],[8,4]],[]],[7,[1,9,[5,9,0,4],[]],[[7,8,10,5],[10,6,10,9],0,9,6],[6,4,[]]]]
+
+[[9],[[[9,9,7],0,[1,10,4]],8,[[1,9,4],[4,10,2,4],[5,6,9,9,8]]],[[],[7,[1]],[4,10,1,[],[1]],[[4,10,8,4],[9,4,8,1,0]]],[10,10],[[[0,4,3],[5,8,4,5]],[],[1]]]
+[[[1,[],4,[10,1,7,4,0]],7,[[6,8,9,10,9],[4,10,2],[1,5,3,3,10],6],[[5,2,5,9],[8,8,9]]],[[0]],[10,[5,[9,3],2],[],[0,7,[9,10,3,5,9],1,1]]]
+
+[[7,[],0,[[4],[9,1,10,9,0],[],8],[3,[1,8],7]],[1],[]]
+[[1,[3,6],[5,3,0,5,4],5],[[[8,3,1],2,[10],[],7],[1,[4],[6,10,0,8,6]],[[1,10,7,4],8],10],[5,[5,3,6],6,1]]
+
+[[4,1,6,7,8],[],[4]]
+[[[],[1,3,8,7,5],1]]
+
+[[],[],[[3,[7,2,5,0],5],[4,[3,10,9,4,1],5,6,[7,7,10,0]],7],[9,8]]
+[[[],10,2,[[9,9,8],0,[8,2,3,9,1],[5,3,4],1],[2,7,[1,8,0,6],[8,8]]],[[[7],[4,5,7,8],5,7,5],7],[[6],5],[[[3,0,6,4],10],8,[],[9,[]]]]
+
+[[[],3,[2,[],[8],4,[9,5,9,9,4]],[[],[0]],[1,5,[4]]]]
+[[[2,4,1,[3,5,6,2],9],4,[1,1,[],[3,2,7]],4],[[],8,4],[3]]
+
+[[[[0,6,8],[8,7,7,10,4],[1]],[[2,7,3],3]],[],[]]
+[[4,7,4,6,[0]],[[[6,9,2,5,8],6,[7],10],4,1],[[[4,5,5,2,9],6,8,9],[[1,6,4,3]],7,[]],[[[4,4],[3,6],[5,9,7],4,6],2,5,6]]
+
+[[[0,[9,4]],8,[8,10,8,[8,10,8]],[8,[3,9,6],10]],[[10,[7],8],2],[],[]]
+[[1,3,[10]],[4,1],[0],[[0,10,8,6],2,[[7,3]]]]
+
+[[[0,[0],3,[3]]],[],[7,4]]
+[[6,[],9,[[2,10,8,6,2],[6]],[[2,10,0,0,6],7,5,[8,1,10],9]],[[[],[3,1,1,1],[9]],7,1,7,[]],[],[1]]
+
+[[1,1,[]],[8,2,9,5],[[6,8,[10,6,9],[9,1,4,8],[3,7,0]],[]]]
+[[[10,[9,5,9],9],[4,8,0,4,[5,4]],9,[4],0],[[6,[0,2]],10,5],[],[[[1,5]],4,[3,[1,4,4],[7,10,5,6],6,0]],[]]
+
+[[8,6,[],7],[[],[],3,[[2,4,6]],[[3,9],5,[8],[6]]]]
+[[6,[[10,9,9],6,[1,1,8,1]],[[4,6,10,3,1],[4,2,10,1,9],0,1],[[]]],[6,[[1,7,0,8,5],[5,2],[4,8,7,10],[4,4],[4,6,4,10,9]]],[[8],[[6,4,10,8],[3,9,9],[5,4,5],[3,4,10,5,6]],6,[0,[2,5,0,2,0]]]]
+
+[[8,[4,6,[1],[9,6,3]],[7],10,7],[10,3],[[4,1,[8,4,8,7,2]],1,10]]
+[[[[9,7,8],4,[2,6,6],3,7]],[8,0,10,[[1,5,3,6],4,[],[7]]],[[]],[[[7,10]],0,2,8,[[],[7,4,8],6,4]]]
+
+[[4,[[5,3,9,4,0]],4,[[],[3,9,3,1,1]],10],[[3,[7,3,9]]],[[5]],[[[1,8,4,0],[5,4,5],[10],6,[7,10,9]],10,[3],[5]]]
+[[],[8,4,10],[2,3,[10],7],[[[9,1,2],5,6],[],6,6],[[[7,9,10,0,7]]]]
+
+[[0,6,5,[3]],[9,[],[]],[],[[1,9,[2],8]],[[[3],[7,4,4],[]],[6],[[7,5,2,1],[9,5,8,0],[4,5,10,8,5],9],2]]
+[[10,[[2,7],0,[4,10]]],[0],[[],9],[6,[[10,1,5],[0,3,8,0],10,[3,10]],0,5]]
+
+[[4,7,6,[[10,4,1,8,3],6,[4,4,7],8]],[4]]
+[[6,[[5,8,8,10],[7,2],1]],[[[1,10,9],[2,1,8,6],[6,10]],[4,2]],[0,[[1],10,[1,7,4,6],3,2],3,[0,4,[]],[[9],[3,3,5,9],5]],[[5,8,4,[0]]]]
+
+[1,10,7,0]
+[1,10,7,0,7]
+
+[[[],6,[[8,7,7],[]],[],[[1,0],4,10]],[6,[[6,0,1],[2,5,3,9],[1,3,7]]],[4,7,[4],[[3,7]],7],[[10,9],[9]],[[[7],8,[],[6]],[[4,10,4],[]],1,[0,4,[5,4,1,4,6]],6]]
+[[[],[3,7]],[3],[],[[],[[4,2,10],[2,2,2,9],[8,5,0,7]],0],[[[8],[4,10,7,4]]]]
+
+[[[],[4,3,[8,9,4,2],10],[3,6,5,[]],[]]]
+[[6,5],[[8],1],[10,[2,1],0,3],[[[0,3,1,8]],[],0,4,[3,3,6,[5,3,8]]],[[7,[5,10,2,7,5],10],[[0,2,7,4],2,[8,10,10,0,6]],[[5],[],[0],[]],[[9,0,6,9],9,1,[9]]]]
+
+[[[4],[3,5,9,[]]],[6,10],[9,[[6],[],[2],[2,1]],0,[]]]
+[[[1,0,9,10,[9,5,1,2]],[],0,[[6,1,8,9,5]],[[],2,7]],[[10],7,[9,[1,5,8],[8,7],4,3],[2,[5,3,9,8,2],4]],[2,7,[[6,10,6,2,3],6]],[[[9,4,4,8],4,0,[3,7,2,8]],[[],8,[]]]]
+
+[[4],[[[1,3,2,8,10],[],[0],5,[2,6]],[0,[5,0,10]],[],9,1],[],[[[0],9],[[3,0,8],1],5,[3,[1],[4,3,6]]],[8,1,[0,[4,7,3,0],[3,1,1],5,10],10,6]]
+[[[5,9,[7]],9,6,[10]]]
+
+[[5,[[2,9]],[[6,0,3,10]],3,4],[3,4,8],[9]]
+[[3,[],3,8,3],[1,6,[[10,2],[2,4,10]],7,[]],[4],[[],[],4,3,8],[[],3,0,6]]
+
+[[4],[],[[[1,5,0,10,1],10,5,3,[9,3,7]],[6,4],8],[]]
+[[],[0,1,[4,0,3,1],3,5],[10,[[4,9,2,8]]]]
+
+[[[8,[3,4]],7,[]],[[8,3,4],[7,[5,0,3,3,0],[10,5,6,10],1],[5,1,[8],10,9]]]
+[[1],[9,4,[4,[2,1,8,2,6],7,[]],[0,7,4],[]]]
+
+[[[[1,7],[10,7,2],8],4,[[5,10],3,[6,7,8]],[[0],2,6,8],3],[9,[[4,10,2]]]]
+[[[10],7,[[],[],0,1],7,[]],[]]
+
+[[[2,0,[0,8,10,3]],0,2,[9,0,[0,2,7],[10,2,2],7],[5]],[],[[8,1,10],2],[]]
+[[10,7,2,2,[]],[[[2,2,6,2,5]]],[],[9,8,7]]
+
+[[5,5,[[10,1],[]]]]
+[[9,2,3,[8,3,[0]],0],[[[10],[10,8],10],6],[[[1],[7,8,1]],4]]
+
+[[6,[],6,6],[[]],[1,[[9],9,6]]]
+[[[[]]],[3,6,7],[7],[3]]
+
+[[8,10],[[0,8,4,9,5],[6,4,9,[5,8]],8,[10,[9,9,6,5],[1,7,1,0,10],2,5]],[1,8,[1],8,7],[]]
+[[[0,2,3,[8,2,8,1]],[8,8,1,[4,10]],2],[3,8,3,2],[6,2,[],2]]
+
+[[[[1,2,4],0,7],[4,[8,9,3],[8,3,3,0,3],[6,2]]],[8],[]]
+[[],[[[9,2,7,9],[1,4,1],7],[[6,8],5,[6,7]],[6,3,[0,1,3,8,0],[]],[[]],1],[5,5,9,6],[1]]
+
+[[5,8,[10,5],[6],[]],[[10,6,[0,5],10]],[6,[],[],9,10]]
+[[7],[[[6,5,1,5],[5,10,0,5],6,[]],9],[],[5,2,[2,4,[5],1]],[5]]
+
+[[[4,[0],2,[2],[8,2,9,10,10]],[0]]]
+[[4,3,[[5,9,9,9],9,[0,10,5,6],0]],[[2,5,7,[2,10,5,9,9]],3,[10,[4]],9,1],[[[10,9,1,8,3],6,[2,6],[5,6,10,3],7],5,[2,[2,9,0,4],6,0,[5,8,8,1,0]],[[7],[4,3],[10,8,5,0,4],[8,4,4,7],5],1],[[[],[3]],[[9,5,2,1,1],[5,9]]],[3,4,7]]
+
+[[10,9,10,3,[]]]
+[[[[],[8,7,7,5,8],6,[7,7,8],[3,2,5]]],[4,6,[[4,1,0,6],4,[10,8,6,2,1],4]],[],[[[6],[],6],10,10,2],[6,[[1,5,10,5,9],6],[[4],5,[10,10,9]],10,9]]
+
+[[9,0],[],[[5,[],[4,5]],8]]
+[[7,[[1],6,5,4]],[[6,0]]]
+
+[[[[9,1],[6,5,2,8,8],2,2,7],[[5,3],[8,1,4,9,1]],4],[[2]],[6,4,0,7,3]]
+[[[4],[],[0]],[5,[[7,0,5,0,4]],4,8]]
+
+[[1,[[7],[],5,5,3]]]
+[[],[5],[[8,[5,4,8],[]],3,[3,[10,1,2,2],[7],9],5,0]]
+
+[[3,[1,8],6],[9]]
+[[1,[[3,9,7],4,[4],4,[]]],[[8],[[0],4]],[6],[1,10],[[0]]]
+
+[[1,0,[[7,4,4,8],[],[8,2,3]]],[4,9,0,[[3,3],3]],[3,[]],[1,10,0,9,[3,8,[9]]]]
+[[[10,[5,4,2,1],4,[9,3,8,4]]],[[4],1],[]]
+
+[[4,10,4,1],[[1,10]],[[6,[1,7],[8,0],6],1],[5,[[],[3,4,2]],[]],[9]]
+[[[[3,6],[4,4,0,6],6,[4,4,8],[6,8,4,9]],[10],[6,[6,1,6,7]],5]]
+
+[[[[0,8,1,4],[],7,4,[3]],[5,7,3,[6,6]]],[[[],[4,3,4,0],7,4],[3,[2,4,2],[]],[[4],7],6,[]],[0,[1,5],10,[[6,10,7,3]],[6,[]]]]
+[[[[8]],8,2,[[0,7,7,4,1],[7,9],[],[],4]],[[6],[]],[[],9,6]]
+
+[[[],[0,[4],10,[4,9,10],3],2,4,[]],[7,1,[10,10,5,10,2],7,[0,9,[6,4]]],[[[],5],9,3,7,9]]
+[[[[6,1],2,[6,4,10,3]],[10,[],8,4,[0]]]]
+
+[[[[6,2,7,2],[4],[5,2,0]],[[0,2]],[[3,7,10,8,5],[],[2],4,8],4]]
+[[[],[8,[0],7,[5,6,3,7,3]],6],[[],[[6,10],2,[3,1,7,6]],[6,[]],[[]],4],[[0,[1,8,10,2,5]],3,10,[9,9,[],8],10],[6,7,[[4,9,10,8],1,[]],1,[[8,9],[],1]]]
+
+[[5,[5,[9,6,1,9],[7]],6,[],[]],[10]]
+[[[[9,1],[8],[2,6],[10,4,1],[2]]],[10,0,9,[0,[9,2,5,3],7,4,1]],[7,[[1,1,4,1,2],[10,5,6,9,6],[6,9],6,3],[]]]
+
+[[2,[[4,7,2,8,9],5,4,2,[2]],[[7],[5,6],3,[]]],[9,6,6,[2,2,8,[],[0,3,6,4]],[6,2,8]],[[[2,1],2,[8],[0,5,7,9,10],10],0,[],1,[6,3,10,3,[]]],[[1,9,9],[[10,3,7]],3,[4,[6,3,1],[],[9],6]]]
+[[3,2],[],[[],0,[[2,3,9,4],9,[6,6,1]],[[10,5,1,4],4,2,[5]]],[[[1,0,4],[5,4,4,1,2],[1,6],[4,5],[]],[[0,6,3]],[5]],[]]
+
+[[6],[],[0,[7],[],8,0]]
+[[],[[8,[8,0,0,4],9,7,2],[[2],[9],[1,8,5,0],[5,5,7,3]]],[9],[[],[9,10,[5,5,4,7],[5,1,2,0,5]],[[1,0],10,[5,10,1],9],0]]
+
+[[8,[[3,0,2,2,7],7,7,[0,3,0]]],[[[0,3,4],[9,7,0,4,1],9],[[3,10,10,4]],8,8]]
+[[3],[4,6,6,10,[]],[[[7,1,5,10],[5],[10,3],5],6]]
+
+[[10,8,[[3,6,9],10,0],7,2],[[],[]],[6,[[]],[]]]
+[[[[9,10],7,4,0,[6]]],[5]]
+
+[[1,[]]]
+[[[2,8],7,[[10,4],10,[]]],[[[],[2,1],[10,6,2,7],[9]],[[],3,[],[6,4,3,6,3]],[0,[4,8,3,0,5]],8,3],[2,[[5,10,5,0],[6,4,8,4],3,[3,10,5,3],[6,5,3,8,7]],[[10,8,9]]]]
+
+[[[[],9],2,2,8],[3,[[],[10,1,1,4,2],[0,7,3]],8],[[],[4]],[[[]],9,4,[5,[3,5,4,4],[],8]],[]]
+[[6,[8,3,[7],[9,6]]]]
+
+[[[[],7],9,[],1,[[],10,2,9]],[[[8,1,6,6],0],2,5,5,[[8,6,5,3],1,6,4,0]],[[8],10,[],2],[[10,2,7,5,[10,3]],[[10,10],7]],[7]]
+[[10],[5,[1,[0,10,4,4,6],2,[3],7],9],[8,4,6,2]]
+
+[[],[[3,6],[],0,[0,[1],[4,10],4],[[7]]],[8,[[2,8]],[[5,3,6,7]]]]
+[[[8,[1,1,6,7,1]],[],4],[[6,[],[6,7],[5],[5]]],[[[],0],5],[6,10,6,[]]]
+
+[[[],[5,[9],[10,4],[1],7]],[1,[2,[10,1,9,0,6],5]],[[[2]],[],[[8,1,9,8,8],8,[],6,8]],[[[6,3,6,4,2],1,[4,6,6,10,9],8,[9,7,7,10]],10],[2]]
+[[4],[[],7,9,[[0,8,1,2],[9,8],0,[5],8]],[[8,[9,6],3,[5,6]]],[6,[5,[9,10,4,7],4],[],2,6],[[],8,[[7,7]],[6,0,[8]]]]
+
+[[9],[1,[],2,[[],5,[7,9,2,1],[7],[]],3],[0,[],[[5,1,2,0],0,[10,9,10,6,10],[8,1],5]],[7,[[3,8,9,10],[0,2]],[2,0],9,[[1,3,9,3,9],[6,6,3],[]]],[4]]
+[[[6,3,7],9,[[1,3,5,8,10],1,[6,10,10,9],3,[1,7]]]]
+
+[[],[[],5]]
+[[8],[7,2,10]]
+
+[[6,[4,[3],[],[1,7,4,2,5],[3,10,10]],8,[],[9,8,[]]],[[0,0,3],[5,[5,2,5],4,[5,1,2,8,6],9],4],[[]]]
+[[1,10],[4],[[0],3,[[8],5,[2,6,10,3]]]]
+
+[[],[8,5,9],[[[5],[3]],7,4,4],[8]]
+[[],[]]
+
+[[8,[],0]]
+[[4,4,6],[9,5,[[3,8,4,5],5],9,[[5,3],[0,4,0,3],3,[4,10],7]]]
+
+[[[[6,2,3,9,9],[4,1],10,[],3],[4,1,[8,5,5,8],[6,7,2],[4]]],[[[10,4,2,10,9],[2],[2,4,6],3],[[0,8,10],[4],[0,7,0,9,0]],[3]],[4,7,3,8]]
+[[[6,5,0],9,5,7,2],[[[],[],7,3,0]],[[7],[],4],[1,6,6,[],9]]
diff --git a/day13b/examples/test.txt b/day13b/examples/test.txt
new file mode 100644
index 0000000..af73fbb
--- /dev/null
+++ b/day13b/examples/test.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]
diff --git a/day13b/src/main.rs b/day13b/src/main.rs
new file mode 100644
index 0000000..7d01374
--- /dev/null
+++ b/day13b/src/main.rs
@@ -0,0 +1,199 @@
+#![feature(iter_array_chunks)]
+
+/// --- Part Two ---
+///
+/// Now, you just need to put all of the packets in the right order.  Disregard the blank lines in
+/// your list of received packets.
+///
+/// The distress signal protocol also requires that you include two additional divider packets:
+///
+/// [[2]]
+/// [[6]]
+///
+/// Using the same rules as before, organize all packets - the ones in your list of received
+/// packets as well as the two divider packets - into the correct order.
+///
+/// For the example above, the result of putting the packets in the correct order is:
+///
+/// ```
+/// []
+/// [[]]
+/// [[[]]]
+/// [1,1,3,1,1]
+/// [1,1,5,1,1]
+/// [[1],[2,3,4]]
+/// [1,[2,[3,[4,[5,6,0]]]],8,9]
+/// [1,[2,[3,[4,[5,6,7]]]],8,9]
+/// [[1],4]
+/// [[2]]
+/// [3]
+/// [[4,4],4,4]
+/// [[4,4],4,4,4]
+/// [[6]]
+/// [7,7,7]
+/// [7,7,7,7]
+/// [[8,7,6]]
+/// [9]
+/// ```
+///
+/// Afterward, locate the divider packets.  To find the decoder key for this distress signal, you
+/// need to determine the indices of the two divider packets and multiply them together.  (The
+/// first packet is at index 1, the second packet is at index 2, and so on.) In this example, the
+/// divider packets are 10th and 14th, and so the decoder key is 140.
+///
+/// Organize all of the packets into the correct order.  What is the decoder key for the distress
+/// signal?
+use clap::Parser;
+use itertools::Itertools;
+use nom::branch::alt;
+use nom::bytes::complete::tag;
+use nom::character::complete::i8;
+use nom::combinator::{map, opt};
+use nom::error::{ContextError, ErrorKind as NomErrorKind, ParseError};
+use nom::multi::many1;
+use nom::sequence::{delimited, terminated};
+use nom::IResult;
+
+use std::cmp::Ordering;
+use std::fs::File;
+use std::io::prelude::*;
+use std::io::BufReader;
+use std::path::PathBuf;
+
+const FILEPATH: &'static str = "examples/input.txt";
+
+pub type Input<'a> = &'a str;
+pub type Result<'a, T> = IResult<Input<'a>, T, Error<Input<'a>>>;
+
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub enum ErrorKind {
+    Nom(NomErrorKind),
+    Context(&'static str),
+    Custom(String),
+}
+
+#[derive(Parser, Debug)]
+#[clap(author, version, about, long_about = None)]
+struct Cli {
+    #[clap(short, long, default_value = FILEPATH)]
+    file: PathBuf,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct Error<I> {
+    pub errors: Vec<(I, ErrorKind)>,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq)]
+enum ListEntry {
+    Value(Option<i8>),
+    List(Vec<ListEntry>),
+}
+
+impl Ord for ListEntry {
+    fn cmp(&self, other: &Self) -> Ordering {
+        let res = compare(&self, other);
+        match res {
+            Some(x) => match x {
+                true => Ordering::Less,
+                false => Ordering::Greater,
+            },
+            None => Ordering::Equal,
+        }
+    }
+}
+
+impl PartialOrd for ListEntry {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl<I> ParseError<I> for Error<I> {
+    fn from_error_kind(input: I, kind: NomErrorKind) -> Self {
+        let errors = vec![(input, ErrorKind::Nom(kind))];
+        Self { errors }
+    }
+
+    fn append(input: I, kind: NomErrorKind, mut other: Self) -> Self {
+        other.errors.push((input, ErrorKind::Nom(kind)));
+        other
+    }
+}
+
+impl<I> ContextError<I> for Error<I> {
+    fn add_context(input: I, ctx: &'static str, mut other: Self) -> Self {
+        other.errors.push((input, ErrorKind::Context(ctx)));
+        other
+    }
+}
+
+fn parse_list(input: &str) -> Result<ListEntry> {
+    alt((
+        map(i8, |v| ListEntry::Value(Some(v))),
+        map(tag("[]"), |_| ListEntry::Value(None)),
+        delimited(
+            tag("["),
+            map(many1(terminated(parse_list, opt(tag(",")))), |list| {
+                ListEntry::List(list)
+            }),
+            tag("]"),
+        ),
+    ))(input)
+}
+
+fn compare(lhs: &ListEntry, rhs: &ListEntry) -> Option<bool> {
+    use ListEntry::*;
+    match (lhs, rhs) {
+        (Value(lv), Value(rv)) => {
+            if lv == rv {
+                None
+            } else {
+                Some(lv < rv)
+            }
+        }
+        (Value(None), List(_)) => Some(true),
+        (Value(_), List(_)) => compare(&ListEntry::List(vec![lhs.clone()]), rhs),
+        (List(_), Value(None)) => Some(false),
+        (List(_), Value(_)) => compare(lhs, &ListEntry::List(vec![rhs.clone()])),
+        (List(lv), List(rv)) => lv
+            .iter()
+            .zip_longest(rv.iter())
+            .find_map(|pair| match pair {
+                itertools::EitherOrBoth::Both(l, r) => compare(l, r),
+                itertools::EitherOrBoth::Right(_) => Some(true),
+                itertools::EitherOrBoth::Left(_) => Some(false),
+            }),
+    }
+}
+
+fn main() {
+    let divider_packets: [ListEntry; 2] = [
+        ListEntry::List(vec![ListEntry::Value(Some(2))]),
+        ListEntry::List(vec![ListEntry::Value(Some(6))]),
+    ];
+
+    let args = Cli::parse();
+
+    let file = File::open(&args.file).unwrap();
+    let reader = BufReader::new(file);
+
+    let res: usize = reader
+        .lines()
+        .filter_map(|line| {
+            let s = line.unwrap();
+            if s.is_empty() {
+                return None;
+            }
+            Some(parse_list(s.as_str()).unwrap().1)
+        })
+        .chain(divider_packets.clone().into_iter())
+        .sorted()
+        .zip(1..)
+        .filter(|(x, _)| x == &divider_packets[0] || x == &divider_packets[1])
+        .map(|(_, idx)| idx)
+        .take(2)
+        .product();
+
+    println!("{res}");
+}