day 13

inputs/day13.txt

@@ -0,0 +1,449 @@
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+[[10,8],[1,[5,[9,9,5]],1,[[4,8,10],10,8]]]
+[[[2,3,9,3,[2,8]],6],[2,10],[[[2,10],9,1,5],[6,[],[1,0,2,10,8],5],10],[4]]

src/bin/day13_1.rs

@@ -0,0 +1,8 @@
+use std::fs;
+
+use aoc2022::day13::process_part_1;
+
+fn main() {
+    let file = fs::read_to_string("./inputs/day13.txt").unwrap();
+    println!("{}", process_part_1(&file));
+}

src/bin/day13_2.rs

@@ -0,0 +1,8 @@
+use std::fs;
+
+use aoc2022::day13::process_part_2;
+
+fn main() {
+    let file = fs::read_to_string("./inputs/day13.txt").unwrap();
+    println!("{}", process_part_2(&file));
+}

src/day13.rs

@@ -0,0 +1,138 @@
+use std::cmp::Ordering;
+use std::fmt::{Debug, Formatter};
+
+use itertools::Itertools;
+use nom::branch::alt;
+use nom::bytes::complete::tag;
+use nom::character::complete;
+use nom::character::complete::newline;
+use nom::multi::{many1, separated_list0, separated_list1};
+use nom::sequence::delimited;
+use nom::{IResult, Parser};
+
+pub fn process_part_1(input: &str) -> usize {
+    let packets = parse_input(input).unwrap().1;
+
+    packets
+        .iter()
+        .tuples::<(_, _)>()
+        .enumerate()
+        .filter_map(|(i, (a, b))| match a.cmp(b) {
+            Ordering::Less => Some(i + 1),
+            Ordering::Equal => panic!("oh no"),
+            _ => None,
+        })
+        .sum()
+}
+
+pub fn process_part_2(input: &str) -> usize {
+    let packets = parse_input(input).unwrap().1;
+    let div_2 = Packet::List(vec![Packet::List(vec![Packet::Value(2)])]);
+    let div_6 = Packet::List(vec![Packet::List(vec![Packet::Value(6)])]);
+
+    packets
+        .iter()
+        .chain([&div_2, &div_6])
+        .sorted()
+        .enumerate()
+        .filter(|&(_i, item)| item == &div_2 || item == &div_6)
+        .map(|(i, _)| i + 1)
+        .product()
+}
+
+#[derive(Clone)]
+enum Packet {
+    List(Vec<Packet>),
+    Value(u32),
+}
+
+impl Debug for Packet {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Packet::List(v) => write!(f, "{v:?}"),
+            Packet::Value(v) => write!(f, "{v}"),
+        }
+    }
+}
+
+impl Eq for Packet {}
+
+impl PartialEq<Self> for Packet {
+    fn eq(&self, other: &Self) -> bool {
+        match (self, other) {
+            (Packet::Value(a), Packet::Value(b)) => a == b,
+            (Packet::List(a), Packet::List(b)) => a == b,
+            (Packet::Value(a), Packet::List(b)) => &vec![Packet::Value(*a)] == b,
+            (Packet::List(a), Packet::Value(b)) => a == &vec![Packet::Value(*b)],
+        }
+    }
+}
+
+impl PartialOrd<Self> 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, other) {
+            (Packet::Value(a), Packet::Value(b)) => a.cmp(b),
+            (Packet::List(a), Packet::List(b)) => a.cmp(b),
+            (Packet::Value(a), Packet::List(b)) => vec![Packet::Value(*a)].cmp(b),
+            (Packet::List(a), Packet::Value(b)) => a.cmp(&vec![Packet::Value(*b)]),
+        }
+    }
+}
+
+// I originally parsed tuples but for part 2 I needed the full list without tuples.
+// so lets just parse without. We'll just tuple-ify the iterator afterwards.
+fn parse_input(input: &str) -> IResult<&str, Vec<Packet>> {
+    separated_list1(many1(newline), parse_packet)(input)
+}
+
+fn parse_packet(input: &str) -> IResult<&str, Packet> {
+    alt((
+        complete::u32.map(Packet::Value),
+        delimited(tag("["), separated_list0(tag(","), parse_packet), tag("]")).map(Packet::List),
+    ))(input)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const INPUT: &str = "[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]";
+
+    #[test]
+    fn day1() {
+        assert_eq!(process_part_1(INPUT), 13);
+    }
+
+    #[test]
+    fn day2() {
+        assert_eq!(process_part_2(INPUT), 140);
+    }
+}

src/lib.rs

@@ -13,3 +13,4 @@ pub mod day09;
 pub mod day10;
 pub mod day11;
 pub mod day12;
+pub mod day13;