day 13 solution

2022/day13.txt

@@ -0,0 +1,449 @@
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2022/src/days/day13.rs

@@ -0,0 +1,82 @@
+use anyhow::Result;
+use std::cmp::Ordering;
+use std::fs;
+
+#[derive(Debug, Clone, Eq, PartialEq)]
+enum Packet {
+    Num(i32),
+    List(Vec<Packet>),
+}
+
+fn parse(s: &str) -> Packet {
+    if &s[0..1] == "[" {
+        let mut stack: i32 = 0;
+        Packet::List(
+            s[1..s.len() - 1]
+                .split(|c| {
+                    if c == '[' {
+                        stack += 1
+                    } else if c == ']' {
+                        stack -= 1
+                    }
+                    c == ',' && stack == 0
+                })
+                .filter_map(|s| (!s.is_empty()).then(|| parse(s)))
+                .collect(),
+        )
+    } else {
+        Packet::Num(s.parse().unwrap())
+    }
+}
+
+impl Ord for Packet {
+    fn cmp(&self, other: &Self) -> Ordering {
+        match (self, other) {
+            (Packet::Num(a), Packet::Num(b)) => a.cmp(b),
+            (Packet::Num(_), _) => Packet::List(vec![self.clone()]).cmp(other),
+            (_, Packet::Num(_)) => self.cmp(&Packet::List(vec![other.clone()])),
+            (Packet::List(a), Packet::List(b)) => a.cmp(b),
+        }
+    }
+}
+
+impl PartialOrd for Packet {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+pub fn run() -> Result<()> {
+    #[cfg(not(feature = "test_input"))]
+    let file_contents = fs::read_to_string("day13.txt")?;
+
+    #[cfg(feature = "test_input")]
+    let file_contents = fs::read_to_string("tests/day13.txt")?;
+
+    let mut packets: Vec<Packet> = file_contents
+        .trim()
+        .lines()
+        .filter_map(|s| (!s.is_empty()).then(|| parse(s)))
+        .collect();
+
+    let mut part1 = 0;
+    for (packet_index, packet_pair) in packets.chunks(2).enumerate() {
+        let o = packet_pair[0].cmp(&packet_pair[1]);
+        assert!(o != Ordering::Equal);
+        if o == Ordering::Less {
+            part1 += packet_index + 1;
+        }
+    }
+    println!("part one: {}", part1);
+
+    let div1 = parse("[[2]]");
+    let div2 = parse("[[6]]");
+    packets.push(div1.clone());
+    packets.push(div2.clone());
+    packets.sort();
+    let i1 = packets.binary_search(&div1).unwrap() + 1;
+    let i2 = packets.binary_search(&div2).unwrap() + 1;
+    println!("part two: {} * {} = {}", i1, i2, i1 * i2);
+
+    Ok(())
+}

2022/src/days/mod.rs

@@ -2,6 +2,7 @@ pub mod day1;
 pub mod day10;
 pub mod day11;
 pub mod day12;
+pub mod day13;
 pub mod day2;
 pub mod day3;
 pub mod day4;

2022/src/main.rs

@@ -48,6 +48,9 @@ fn run_day(number: i32) -> Result<()> {
         12 => {
             days::day12::run()?;
         }
+        13 => {
+            days::day13::run()?;
+        }
         _ => return Err(anyhow!("Invalid day provided")),
     }
     Ok(())

2022/tests/day13.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]