Day 13

2 files changed, 595 insertions, 0 deletions

diff --git a/2022/inputs/day_13.txt b/2022/inputs/day_13.txt
new file mode 100644
index 0000000..0bd78e3
--- /dev/null
+++ b/2022/inputs/day_13.txt
@@ -0,0 +1,449 @@
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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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+
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+
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+
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+
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+
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+
+[[10],[6],[[6,[5,2,7,10,1],[1,6,6],[9,6,10,8],10],2,9,[[0,3,7],0]],[[[3,2],2,9,[]],10,7],[3,1,[6],[9,10,[]]]]
+[[[],[[]],6],[[],[],[7],[]],[3,0,8,5]]
+
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+
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+[[8,4],[[4,1,[1,3,3],0,[0,10]],[[0,6,8],0,[7,5,4],6,[7,2,5,7]],10,2,9]]
+
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+[[6,[[0,7],0,[6],3],9,[[8],3,[1,5,0,8,6],[]]],[0,8,2,2,10]]
+
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+[[[10,9,[],[5,2,8,3]],[8,[8,1],9,[]],10],[6,8,[9,[7],9,[5,8,8,10,1]]],[4],[[[4,9,6],5,9],4,4]]
+
+[[],[],[[0,[5,5,5,1,3],1,[],0]],[[5,1,[2,10],[1]],9,2,[8,9,[10,10]]]]
+[[[3,1]]]
+
+[[[8,3,[4,2,1,2]],[10],9],[[0,5],[2],3,1],[0,[[1,7,7,9]],1,[8,[7,6,8],5]],[[8,[8,8]],[10,3,[3],[10,9,1]],[]]]
+[[[[2,0,2]],[0,2,9]],[8,5,[0],[8,6],10],[10,[[5,1,4],3],10],[[5,[],0,3,[2,4,7,8]]]]
+
+[[],[[],[6,[5,7,5,5],[8,4,3],6,8],10,[[8,5,6,1,7],[9,8,9,2],[5,2,4,10]],[[8]]],[[5,5,[2,4,4,4,9],9],2,6,[[7,5,7,4,4],3,[],[9]],[[3,9,5]]]]
+[[9,6],[[[0]]],[0,8,[[9,7],4,[8,0,0]]],[]]
+
+[[1,1],[4,1,[5,[0,7,3,5,0],[7,8,9],[4,0,0,8],2],1,[9,[1,9],[],[3,4,8,4,1]]],[[5,0,[4,2,0,9,4],[]],0],[3]]
+[[0,7,[[6,0,8],0,[]]]]
+
+[[],[[],[6],1],[7,[6,3,5],[]]]
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+
+[[[[]],[[1,5,5,3,3]]],[],[1,[8,8,[3,9,6]]]]
+[[[],7,2,6,[9,[5,10,0],[9,6,6,5,5],1]],[]]
+
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+
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+
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+[[[]],[0,3,9,4,0],[[[2,4],[6],[4,2,1],[]]],[[1,0,[0,0],7,6],1,5,7,[2]]]
+
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+[[[10,9,3,0],8]]
+
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+[[[9],[1,0,[],2,[0]],[[0,1],[10,8],[10]]]]
+
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+[[10,10,8]]
+
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+[[6,6,6,7,1],[],[],[],[[[6],[6,3]],[4,0],3,3,[[],[10,4,9,8]]]]
+
+[[1,[[2,1,2,10],5,[],[8,4,2],1],[7,9,[4,5]],[3,[6,6]],5],[]]
+[[]]
+
+[[[3,10],[8,9,9],2,9],[8,[],10,10]]
+[[[[],[0]],3,6]]
+
+[[3,4,[]],[4],[3,9,[5,[1],[],[10,7],[9,0,2,9]],[2,2,9],4],[[[2,2,6]]]]
+[[],[4,6,[[],[],[3,7,5],9,7]],[],[[8,5,7],8,1,3,8]]
+
+[[],[[0,2],0,7,[],[[6]]],[[],[8],[3,[],3],[7,[5,0,4],7],5],[1,1,[[]]],[[[0,10,7,10],2,0,[3,7,1,1]],9]]
+[[[8,[7,6,6]],9],[10,8,9,6],[[[],[1,7,3]],[[5,5,5,1],[],0,[7,7,9,8],7],[10,[],[3,9,7,4,3],10],[[8,7],10]],[[2],[5],4,[[2,6],[7,7,10,7,0],[3,8,3],3,6],10],[9,10,[[6,2]],5]]
+
+[[4,2],[[9,5,7,7,[]]]]
+[[[1,[4,8,7,2,4],4,[4,6,5,6,4]],[8,[6]],8],[3]]
+
+[[3,2,1,8]]
+[[[10,6,[2],2],10],[[],3,10,[[],[],[4],6,8],[[8,5,10],[],5]]]
+
+[[[6,[5,5,0]],5],[[],7,1,[],7]]
+[[3,4,1,6,[[],[4],9]],[[[3,4,5]],[],4]]
+
+[[4,[5,4],[[0,10,9,1,5]],5,5]]
+[[3]]
+
+[[0,[8],9],[3,[[5,7]],8],[[5,7,1,10,4]]]
+[[6,[3,6,3,[9,2,9,2,9]],[[3,4,1,9,5],7,4,10,[5,0,4,4,2]]],[0],[[0,1,[7],[],0],[5,4,[9,3]],9,1,[[6,0],[7,4]]],[[5,8],2]]
+
+[[6,[],[[4],[3,5]],6],[8,[7,5,3]],[5,[[],2,[1,1]],[6,4],[],[[0],9,[0,8,10,4],0]]]
+[[[[10,5,10,4],[9,1,7,6,10],[0]],9,[1,2,3,5],[0,[5,7,4,7],[9,10,7],1,7]],[[[],0],7,[8,[10,1,10,7,8]],[4,1,[4,3,10],[],1],5],[8,9],[[7,10,2,[4],2],[[3],[8,8,0,6],6,4]]]
+
+[[[[7,8,2,2],[8,2,3,0],[4,3,8,0,8]],5,[[9,7,1],[],[1,0],[1,2,6]],9,[[5,1,7],3,[],5]]]
+[[[0,[8,3,5],[5],1],[8],[[4,10,10,8]],0],[[0]],[[[7,2],[8,9],[]],[[],[1,9,7],[9,4,6],[5]],[[5,8,7,2]]]]
+
+[[[],2,[1,[6,6,2,2,5]],8]]
+[[0,[[2,7,6,0]]]]
+
+[[],[10,1],[6,[2,[],8,0,[5,1,7,9,4]],9,4,9],[[[8,5,9,4,1],6],3,[],9,3],[[2],[],[[9,3,7],8,[0,1],[1,2,1,9,1],[]],[[6,7],[5],2,9],[[]]]]
+[[[8,6]],[0],[],[10]]
+
+[[],[9],[],[[[],[2],[9]]],[6,7,10,[8,[],[6,3],0]]]
+[[7],[9,8,[[2,5],[6]],[[3,10,5,5,4],[1,8,3],0,9,[0,2,5]]]]
+
+[[6,[],[[6,6,0,3],[10,0,6,5,0],9]]]
+[[],[[10,[7]],8],[7,7],[[5,1,[10],[8,1,6,0,10],3]],[4,[0,6]]]
+
+[[3],[[6,9]]]
+[[[[5,10],8],10,[[9,1,10,4,4],[10,3],4,[9,9,9,9,5]]]]
diff --git a/2022/src/bin/day_13.rs b/2022/src/bin/day_13.rs
new file mode 100644
index 0000000..b00d790
--- /dev/null
+++ b/2022/src/bin/day_13.rs
@@ -0,0 +1,146 @@
+use nom::{
+    branch::alt,
+    bytes::complete::tag,
+    character::complete::{line_ending, u32},
+    combinator::map,
+    multi::{separated_list0, separated_list1},
+    sequence::{delimited, pair, preceded},
+    IResult,
+};
+use std::{cmp::Ordering, fs};
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let input = fs::read_to_string("inputs/day_13.txt")?;
+    let message = EncodedMessage::parser(&input).unwrap().1;
+
+    dbg!(message.ordered_index_sum());
+    dbg!(message.decoder_key());
+
+    Ok(())
+}
+
+#[derive(Debug)]
+struct EncodedMessage {
+    message_pairs: Vec<(Message, Message)>,
+    ordered_indices: Vec<usize>,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+enum Message {
+    List(Vec<Message>),
+    Value(u32),
+}
+
+impl EncodedMessage {
+    fn parser(input: &str) -> IResult<&str, Self> {
+        map(
+            separated_list1(
+                pair(line_ending, line_ending),
+                pair(Message::parser, preceded(line_ending, Message::parser)),
+            ),
+            EncodedMessage::new,
+        )(input)
+    }
+
+    fn new(message_pairs: Vec<(Message, Message)>) -> EncodedMessage {
+        let mut ordered_indices = Vec::new();
+
+        for (i, (left, right)) in message_pairs.iter().enumerate() {
+            if left <= right {
+                ordered_indices.push(i + 1);
+            }
+        }
+        EncodedMessage {
+            message_pairs,
+            ordered_indices,
+        }
+    }
+
+    fn ordered_index_sum(&self) -> usize {
+        self.ordered_indices.iter().sum()
+    }
+
+    fn decoder_key(&self) -> usize {
+        let mut all_packets: Vec<Message> = self
+            .message_pairs
+            .iter()
+            .flat_map(|(left, right)| [left.clone(), right.clone()])
+            .collect();
+        let divider_1 = Message::List(vec![Message::List(vec![Message::Value(2)])]);
+        let divider_2 = Message::List(vec![Message::List(vec![Message::Value(6)])]);
+        all_packets.push(divider_1.clone());
+        all_packets.push(divider_2.clone());
+
+        all_packets.sort();
+
+        let index_1 = all_packets.iter().position(|m| *m == divider_1).unwrap() + 1;
+        let index_2 = all_packets.iter().position(|m| *m == divider_2).unwrap() + 1;
+        index_1 * index_2
+    }
+}
+
+impl Message {
+    fn parser(input: &str) -> IResult<&str, Self> {
+        alt((
+            map(u32, Message::Value),
+            map(
+                delimited(
+                    tag("["),
+                    separated_list0(tag(","), Message::parser),
+                    tag("]"),
+                ),
+                Message::List,
+            ),
+        ))(input)
+    }
+}
+
+impl PartialOrd for Message {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl Ord for Message {
+    fn cmp(&self, other: &Self) -> Ordering {
+        match (self, other) {
+            (Message::Value(left), Message::Value(right)) => left.cmp(right),
+            (Message::List(left), Message::List(right)) => {
+                for i in 0..left.len() {
+                    if i == right.len() {
+                        return Ordering::Greater;
+                    }
+                    let inner_ord = left[i].cmp(&right[i]);
+                    if inner_ord != Ordering::Equal {
+                        return inner_ord;
+                    }
+                }
+                left.len().cmp(&right.len())
+            }
+            (Message::Value(left), Message::List(right)) => {
+                if right.len() == 0 {
+                    Ordering::Greater
+                } else {
+                    let inner_ord = Message::Value(*left).cmp(&right[0]);
+                    if inner_ord != Ordering::Equal {
+                        inner_ord
+                    } else {
+                        1.cmp(&right.len())
+                    }
+                }
+            }
+            (Message::List(left), Message::Value(right)) => {
+                if left.len() == 0 {
+                    Ordering::Less
+                } else {
+                    let inner_ord = left[0].cmp(&Message::Value(*right));
+                    if inner_ord != Ordering::Equal {
+                        inner_ord
+                    } else {
+                        left.len().cmp(&1)
+                    }
+                }
+            }
+        }
+    }
+}