Day 13

day13/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day13"
+version = "0.1.0"

day13/input.txt

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+[[[0,[5],7],[[]],[2,9,7],2],[8,[[2,0,9,0,1]],8],[[[3,6,8,2],[],1,[3,7]],0]]
+
+[[[[1,9,2,6,6],[6],[7,3,3,4,3],1,[9,3,0,3]],2,[[5,8,0,3,5]],[[7,0],[9,8],[6,5]]]]
+[[[8],8,8],[1],[9,9,[],[8,1]]]
+
+[[5,1,[3,6,[5,4]],[[6,8,10,4]],[[10],[2],[],2]],[6],[2,6,3]]
+[[7,9],[[[4,3,3]]]]
+
+[[10,3,4,8]]
+[[[[2,10,4]],[[]]],[],[7,8,0],[6,[5],7,6,[[10,7,0,7,4],[4,2,9,3,7],[]]],[9,[7]]]
+
+[[6],[[8,[9],[3,6,0,8,6],7],9,4],[[],[[10,0],[9,3,8,10,1],[10,4]]]]
+[[6,[2,[0,0,0,5,5],[7,1,2,9],7],[],0,[8]],[],[6,9,6],[8,4,[[7,3,3],[3],6],0,0],[]]
+
+[[6,[[6,9],5,5],[8],10,[[4,2,8,1,10]]],[[5,[]],10],[6,9,9,3]]
+[[[8,9],[[8],6],5,[[10,3,9]]],[[[1,7,3]],[9],6,5],[[[]],2,[],[[4,5,7],0,6,[10],7]]]
+
+[[],[[4],[[5],[9,7],[4,8,9]],6,3],[0]]
+[[1,[[7,5,1,8],[6],[0,8,9]],[[5,0,4],[1,3,4,9],8,[7,4,4,7]]]]
+
+[[3]]
+[[[],[3,[5,10],2,[6,3,0,0,4]]],[9,[1,[0,5],[8]],2],[[[4,2,9],2,[4,0],8,[]],[1,[],[8,2]],9,[],[]],[[2,[0],[7,7,8],4],8,[3,[8,10,1,9],[8],[1,6,7,3]],8,[0,[2,0,6,5,10],[],8]],[7,[7],5,6]]
+
+[[],[4],[]]
+[[[7],7]]
+
+[[],[3,7,3]]
+[[[7,[9,9,2]],10],[]]
+
+[[[5,[0,8]],6,[[5],6,[6,7,9,8,1]]]]
+[[[9,0,0,6,[5,1,2]],[[7],[2,4,3,7,2],1,[9,2]]],[10,[4,[3,6,3,5,2],5],8],[]]
+
+[[],[10]]
+[[5],[]]
+
+[[[1,1,6,10],[[],3,[8,1,0],[4,10,10,6],[10,4,2,2,7]],5,[[8,6,2],[],[1,4,3,5,3],[4,4,0,10],10],1],[[],5,8],[[3,[],10,6,[8,1]],1,2],[1],[[[0,5,2,4],[4,10,9,2,2]]]]
+[[],[2,[[10,9,1],[10,4,9],4,[2,9,10,7,5],[2,9,0,9]],4,[6,0]]]
+
+[[[],1,7],[6,[2,1,6,5],[[5,6]],6],[[2,5,3,6],[],7],[]]
+[[0,6,[5],[[],4]],[0,9,3,[[7,0,8]]]]
+
+[[[[9],[4,5,0,10,10]],[6,8,[3]],[],[4],[7]],[1,[4,[1,10,7,5,10],[],[]],[[1],8,5,[5]],8,[[4,8,2,10],0,1,[6]]]]
+[[[],4,0,[[2,0,3,5],4,[10,2,3]],4]]
+
+[[8,[],4,1,[]],[],[[1,[4]],0,[10,[5,5,7],[6,6]]],[[[]],[[8]],5]]
+[[[],0,[[10,7,9,6],3,10,6],[]]]
+
+[[[0],6,10],[[[0,0,1,10,7],[0,0,6],8,7],1,[[5,9,4,9]],[[6,2,1,3],[2,9,9,7]]],[[3,4,2,10,[5]],[8],9],[5,1,8,[4]]]
+[[[[10,4,5],[6,1],[9,4,9,5,5],[10]]],[[10],7,[10,[4,4],[8,4,2]],5,9],[7,6,4],[[5,1,9,[1,2,9,10]],3,7],[9,5,[5,[],[],7],[[8,10],6,10,8],10]]
+
+[[[[4,8,9,0,2],[7,7],6,7,0],[7,[7,6],10,2,[]],[9],[2,[7,8,4]],[9,[1,7,6],[0,6],9]]]
+[[6,1,[[],[6,10,1,5,9],7,[4,4,0],[]],[[2,7,5],[],3,[2,0]]],[],[[[],3,9,[6,8]],7],[1]]
+
+[[],[6,[],9,9,[[8],[],9,10]]]
+[[8,[[8,4,0,7,9],3],[[9,9,9]]]]
+
+[[[],3,3,1],[],[6,6,8,[3,[10,3,7,2],1]],[[[2,0,2,1],9,[7,10,10,4],[0,1,6,9],[7,3,8,7]],7,9]]
+[[[0,10,6,4,9],5,8,[]],[[6,9]],[[],[[2,9,9,7,9],[5,2],5],0],[[[2,4,0],[4,8,2,3,1]],5,[1,[1,5,0,10,4],10,9],[[0,7],[9,2,2,6],4],[8,[],[]]]]
+
+[[[[0,1],[6,1,3,3,3],0,10],8,2,7,3]]
+[[2,[4,[4]],4,9],[8,[6],6,8,[6,1]],[]]
+
+[[10],[[],6],[],[],[2,[[9,3,2],[5,3,0,0,6],[6,2],1],[[3,8,2],[10,10,0,0],[5,10,6],[8,5,0]]]]
+[[[[],3,8,2,[2,6]],[[],5,1,[1,5,6,0,9],[10,4]],2,3,[[1,4,10,6],[1],9,[8,4,9]]],[3,2,[[6,4,6,9,8],5],[1,[3,0,6,7,2]],10],[]]
+
+[[[[6,2,2,6],[5,8,5],5,5,0],[],6,[4],[2,9,[9],[2,8,6],6]],[],[[3,[5,8,5]],6,[[9,4],[6,4,10,1,2],[7]],[10,2,[4,3,6],2],6],[[],1,[0,[4,2,4,7],4,[7,2],2],[],[[8,0,8,1,2]]],[[8,8,[]],[[3,4,3,2,0]]]]
+[[[[9,2,1,9],10,[7],[5,8],[1,4,0]],[[],2,[8,5]],7]]
+
+[[[[],[5],0,[5,1,8,10],8],10,2,8],[[]],[[7,4,10,4,[2]]],[[[3],[9],10],[7,6],3,[9,[9,4,5],[4,0],2],2]]
+[[8,[[3,9,8]]],[9],[],[]]
+
+[[[1],[[7,0,9,6]],[2,[5,10],[],0,[10,7,10,4,9]],[[10,4],[7,7,6]]]]
+[[[2,[],[0,6]],[[7,3]],[[]],0],[4,[5,10,[],[7,4,0,1,5]],5,10],[[],[[]]],[8,[[10,3,10,8],2,[8,0],[4,2,7,2,0],5],10,10]]
+
+[[2,[],[]],[[[2,1,10],0,6]],[[[8,9,0],0,[],0,[10]],[[],10,2,4],6,[]]]
+[[[[],9,8,[6,6,7],[4,9,3,3]]],[[5],[[9,1,0],[],[6,1,1,5,2],8],[[5,10,2],1,[0]],[5]],[10,5]]
+
+[[7,1,4,3,[7]],[]]
+[[[7,7],3,[3,[9,3,0,1],[0,1,0,9,9],3,2]],[]]
+
+[[9],[3,[],[6,1,[1,10,7],8],0]]
+[[3],[8,4,[[],[0,7,9,8],10],1],[],[]]
+
+[[7],[],[6,7],[[[9,0,4,10],[4,0,10,9,2],0,[4,2],[]],9,[[0,2,10,2,1]]],[[]]]
+[[[1,8,6,8,[]],[],5],[1],[4,[[2,3,2],[8,7],[2,4,0,2],[6,7,1,8]]],[5,0,10,[5,5,10],[]]]
+
+[[9,[7],8],[0],[6,[0],[1,[7,8]],[6,[5,7],4]],[[[4,5,5,10],[6,6,9,8],[7,9,9,1],3,[6]],[[9,9,1],[9,3,8,4]],[[],[1,10]],[[6,10,1,10,5]]],[[[]],[[]],5,[0,2,7,8,8]]]
+[[[[3,9],[3,8,4,9],[1,7],[10,0,2],[2,3,2]],[[3],[7,10,1],10,[5,1,6]]],[1]]
+
+[[],[8,2,3,10,[[2,0,2,8,1],[],[3,6,3],10,[5]]],[[]],[[],[1,10,3]],[8]]
+[[10,10]]
+
+[[3,[[],[8,8],9,1,[1,5,9,7,4]]],[2,[[3,0,8],[5]],[8],[[5,1,6],8,5],6],[[10,8,3,7,[6,3,4]],[],6,10,3]]
+[[[3,1,5,3,[6]],6,[[9],5,6]],[[[1,10,6,2],[0,10,0,7],[9,4,1,2,9]],1,9],[]]
+
+[[[],9,6],[[[2]],7,[9]],[[4,[1]],10,[[],5,[8,1,6,0]],[4,9,3,[9]],[8,[10],[4]]],[3,[2],[4,2]],[]]
+[[9,6,[[2]]],[[9],[],[9],9,[0,[7,3,0,3],0,[1,6]]],[[5,1],7],[[[5,7],[7,0,4],[]],3,7,[]]]
+
+[[],[4,[6],2,[[8,4],[],8,[8,1,0,5],4],[[9],[]]],[1],[6,[[4,1,6,8],4],[],[],[]],[[8,[9,5,3,3,4],[2]],10,5,[],[7]]]
+[[[[3,0,6],[4,3,6,4]],6,[[8,1]],[[],[0,1,1,4,0]]],[8]]
+
+[[[[0,7,3,7],8,[5]]],[],[8],[[],7,[6],[5,2,1,[9,6,7,3,5]],[[9,8,4,8],0,[4,4]]]]
+[[[],5,2,[],3],[[10,8,[5,8,1,2]],[[0,7],6,4]],[],[3],[6,3,[[]],[8]]]
+
+[[[10,0,9,0],1],[7,[[6,6,0],2,9,3,2]]]
+[[0,[6,2,[8,9,1,3],[1,4,4,4]]]]
+
+[[[[4,7,7,5]],[[6,10],[4,2,5,7,6],1,10,7],[]]]
+[[[10,8,[8,10,1,4],[0],[1,7,0,1]],6,[3,0,0,[3],1]],[1,5,6,[[],2],8],[10,10,[]]]
+
+[[2,7,7,[2,[3,6,1,1]],[5,3,[6]]],[10,9],[],[[[],[3,9,7]]]]
+[[[],[[4,8,8],[9,6,0,10],[6,8,4,7,1]],8,[[],[9,6,6,8],[1]]],[],[5,0,[[4],8,9],9]]
+
+[[0,[10,10]],[[6,9,[5,1],6],10],[10,[[8],0,[4,2,1]],[7,[5,0,10,7],10,1],[8]]]
+[[7,[[5,0,8,1,0],[3]],2,7],[10,[2,6,[8]],[[],7,[],9,[7,6]],8],[[[2,5,2],[2,3,4,0]],4,[[6],[]]],[[[5,0,6,3,2],4,[3],[5],[2,8]]]]
+
+[[0,[[],6,6,[1,10,0]],10,6],[[[4,5,4,6],[1,8],[4,6,5]],4,[5,2]]]
+[[6,7,8,[4,2],6]]
+
+[[[5,[5,4,3,1,10]],[10,4],7,[[6,6,2],1,[2,6,4,4],[7,9,2]]],[[[10,4]],9,6,2,2],[[]]]
+[[[],1,0],[2],[],[[6],6,0,[]],[[],2]]
+
+[[],[[9,[1,4,5],8,3],[[],[2,9,5,3],10,4,8],[2],7],[4]]
+[[[[5]]],[8,[],5,[[7,3,9,5]],[6,10]],[8,4,[[1,0,2,0,4]],[6,6,[5]]],[[[6,7,4,2,4]]]]
+
+[[[2],6]]
+[[4,4,6,[[0,3,9,5],10,[8,4],[9,6]]],[10,6,6,0,[[],4]],[],[[5,9,0,[5],8]]]
+
+[[10,7,4],[3,[],0,[3,1]],[],[5,[1,[6,4]],1,10],[]]
+[[[1,6],3]]
+
+[9,3,1,7]
+[9,3,1,7,6]
+
+[[6,10,[[10,9,2],[2],2]]]
+[[[],[6,[2,3,7,1,9]],[[7,7,6]],[[],8,[8,2,5]],[6,[5],[5,7,8,3],[0,7,9]]]]
+
+[[5,[7,[2,10,5],1],[[],[],[]],[[],1,3],4],[4,[[],[10,2,4],10,9],[7,[9,0,9,7],[8,8,9],[],[1,4,6]],[[4,6,2],[],2,[],5]],[3,8,[0,7,[6],[6]]],[1,[10,9,[3,5]],5]]
+[[9,[0,[3],[9,10,9,9]],10,5,10],[0,6,4,[[3,6,0,0,6],10,0]],[10,9,9,6],[]]
+
+[[0,8],[[[0]],[8],0],[[[]],9,[8]],[1,9,[9,4,7,[5,3,8],7],[7,[7,1],[10,1,6,8]],[]],[[[],[10,6,5,9]],0,2,[],[]]]
+[[[],0,[[4,9,3,8],1,4,6],[5]],[[7],[[],9,[],[5,3,8,10,8],[3]],2,10,[5]],[[[],[9,8,0,10,7]]],[]]
+
+[[4,7],[],[4],[3,9,[[1,6,1,0],1,[2,9,2],4,[10,7,4,4,0]]]]
+[[[9],[1,[2,9,9],[3,8],1,5],2],[],[[[5,0],[4],7,2],[9],2,[[],[0,8]],9],[3],[4,8,[4]]]
+
+[[8,5,4]]
+[[3,[],8,6,6],[],[[],10,1,[0,[1]],[[3,8,5],[1,7,6],[],1]]]
+
+[[7,10,2,[[4,1,2,0],[5,8,2,7,5],[1,7,3,1]],[[10],7,5,8,1]],[[1]],[[10],6],[9],[10,[[8],[9,8],10,[2,9,8,0,10]],[3,0,6]]]
+[[[[6,10],[2,8,7,6,2]],3,[1,6,4,[8,10,0,2,5]],[4,6,4],[[2],2,[2],[0,4,5,0,10]]],[[[],[9],[6,6,3,1,10],1]]]
+
+[[[5],5,6,8],[[0,[1,8,9],4,[9,3,3,2],[4,7]]],[7,[[8,8,4,7,6]]]]
+[[10,6,[2,1,8,0,7],4],[[]]]
+
+[[],[1,[3,[10,8,0,6]],3,[10,3,5,[10,6,1]]],[1,[[8,3,5,1],0,1,0],[[],[1,4,0]],[[5,5,5,10],[],[1],[],10]],[[[0],[],8,4,[0]],[3,9],5,10]]
+[[0],[3,[6],[[10,4,6],[4,5]],3,[]],[[],2],[9],[]]
+
+[[8]]
+[]
+
+[[3,[6,[3],1,8],8,10,10],[2,[3,0,[1,8,2]]]]
+[[5],[9,[2,[5,3,8,8,3]]],[[[6,3],[4,2,1,6],[0],9],[4],[[9],5,7,5,9],3,6]]
+
+[[10,8,[[]],[[9,10],10,[10,7,10,3]]]]
+[[[]],[0],[]]
+
+[[[[8,5],2,0,5,[2,8,10,10]],[8],5,4],[4,9,10],[2,[[9,6],[6,10,2]],[[4,4,5,4]],2,0],[[9,[7,3,6],1,[]],[[5,3,3,5,5],8],[[5,4],[],[6,1]],[],[10,2,[],[]]]]
+[[4],[[10],[]]]
+
+[[[[10,7,4,5]],9,4],[[[3]],[2,2],[4],[[],4,[10,7],4],[5,5,[9,10,4,3],0]],[8],[[[6,0,3],[8,2,10,0,2],[8,2,10]],9,2,9,2],[[8],2,[9,[3,2,8,7,3],10],[[9,7],4,[3,5,6],6,7],[[9,9,6],[]]]]
+[[[[3,7],[5,1,2,8],4,0]]]
+
+[[8,[[8,4,8,5]],6,[[]],[6,[]]],[4,[1,[4,8,9],[]]],[[],10,[6,[],[7,3,7],[]],3],[[]]]
+[[[[5],[],8]],[10,4,1]]
+
+[[10,[4,7],[9,[],2,7],9,10],[2,3,4],[1,[1,3,[2,4],10],[[1,6,7,4,4],5,4,8],5]]
+[[2,9]]
+
+[[[[7,7,8,3,5],0,10,10],[1,7,[6,4,6,0,7],[9]],[],2],[],[[],2,[9,[9,10],9,[6],[5,7,7,6]]],[[],4,5]]
+[[3,2,8,[2,4,[7,6],[3,5]],4]]
+
+[[3,8,10,[[7]]],[3],[]]
+[[5],[8]]
+
+[[[[7,10,9,1],3]],[[[6,6,10],[]],3],[4,5,[[]]],[[],[],[[5,3],[4,6,6],[6,3,6]]]]
+[[[[9,3,8,5,6],2,[8],2]],[[],4],[[6,[2,10,1],7,6]]]
+
+[[4,6]]
+[[5,[],7,9,8]]
+
+[[5,[],2],[4,[0,[9,10],[3,3,5,10],[4,5,0,0],[9,8,3,7]]],[[[10],[5,2,6],[1,9,2,3,5],[6,8,10,9,8],8],0,4],[1,1,[2,1,2,[2,4,8,1],[1,8,4]],[7,[2,0],4,[9,10,2]],7],[4,6,[[8,5],7,8,8],[1]]]
+[[[],3,8,10,[[]]],[[[9,2,10,10]],[6,[0,3],[5],9,[2]],[6,3,6,9],[]],[[[7,8,7,7],[4],9,1,3],10,[8,7],5,0],[],[[[7,0,2,1,6],4],10]]
+
+[[],[[2,8,3,3,10],[[7,4,10,8],10,[5,9]],[[2],7,9,1],[[],[7,8],[10],[8]],[]],[[[],[],[9,9,4,6,10],[6,5,2],[]]]]
+[[],[[]],[[[4,6],[],[9,5,5]],3,[7,4,0],[8,8],[0,[4,4,3],[],9,4]],[[6,[9,6,1],[4]]]]
+
+[[[2,[],[8,4,8,7],3,[1]],3,6,2],[]]
+[[[],[[],1,6],0],[10,8,7,[[6,3],[3,7],4,10,8]]]
+
+[[],[1,10,5,[4,[0,9,1,1]],[[9,3,6,1],10,4,3,5]],[10,8,[5]],[1,[6]],[1,[[5,9],[],5,[]]]]
+[[]]
+
+[[[[1],6,[9,1,10],[7]],[[10,8,10,4,7],1]],[8,[7,1]],[[[2,3,10],4,8,2],[[5,10,0,6],[1,2,6,9],[]],[[],[3,10],[1,2,3],2],10],[]]
+[[5,[0,[7]],[],[[9]]],[],[10,[5,[7]],[[10,7,4,0]],1]]
+
+[[1],[[4,5,6,[]],[],[[7,7]],[10,[1,10],[0],7],6],[10],[[],[[7],6,[7,0,6,6,5],[4,2,8,4,7],[10]],8,2,10],[1,0,5,3]]
+[[8,[2,[6,8,7]],6,2,7],[1,2]]
+
+[[[[4,8,9,7,2],[],9,[6,9,10]]]]
+[[1,1],[],[0],[[[],[4,1,7],[1,8,3]],9,[7,[],[3,9,8]],2],[[]]]
+
+[[6],[7],[9,[0,[8,6]],[9]]]
+[[[[6],[],[2,10],0],[8,[4,10],[4,5,8,0,0]]],[3,1],[[10]]]
+
+[[9,[[4,0,7,6,1],3,4,[2,10,6,8,8],[2]]],[[],[],[[8,2,10,7,10],[10,8,1,0],1],[]]]
+[[4,2,4,3,6],[[7,[7,6,5,8,7],[0,4]]],[],[8,5,[3,[1,9,5],[2,8,8,8,3],4,7],7,5]]
+
+[[[3,9,[7,10,2,1]],[]],[[6],2,6],[10],[],[[],6]]
+[[[[10,2]],2,[[8,6,0,8]],3],[8,7],[]]
+
+[[],[3,9,7,[10,5,[6],[]]],[[[2],[3,3,3,2],[4,5,0],[]],[],4,2]]
+[[[1,9,8,[5,7]],0,4],[[5,[0,6,4,6,4],6,[4,1,5,3,4]],0,[[7,0,0,9],[9,5,4,1]],[]],[[8,9,6,0,3],[],[0,[]],[]],[[[],[1,4,4]],8,[6]]]
+
+[[[],4,[[10],6,0,3],[[7,5,1,2],[],3,1]],[2,[],2],[2,[7,[8,7,4,8],2,10],[],4],[9,[[4,4,5,9],0,4,7,6],[[]],[8],10]]
+[[9,0,[[],1,3,2],[3,[],[1,4,0,2],5,8]],[],[[1,2,0,2,0],[[]],[[0]],8,7]]

day13/src/main.rs

@@ -1,3 +1,138 @@
-fn main() {
+use std::{cmp::Ordering, fs::read_to_string, str::Lines};
-    println!("Hello, world!");
+
+#[derive(Debug, Clone, Eq)]
+enum Node {
+    Number(i32),
+    List(Vec<Node>),
+}
+
+impl PartialEq for Node {
+    fn eq(&self, other: &Self) -> bool {
+        self.partial_cmp(other) == Some(Ordering::Equal)
+    }
+}
+
+impl Ord for Node {
+    fn cmp(&self, other: &Self) -> Ordering {
+        self.partial_cmp(other).unwrap()
+    }
+}
+
+impl PartialOrd for Node {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        match (self, other) {
+            (Self::Number(n1), Self::Number(n2)) => n1.partial_cmp(n2),
+            (Self::Number(n), Self::List(_)) => {
+                Self::List(vec![Self::Number(*n)]).partial_cmp(other)
+            }
+            (Self::List(_), Self::Number(n)) => {
+                self.partial_cmp(&Self::List(vec![Self::Number(*n)]))
+            }
+            (Self::List(l1), Self::List(l2)) => {
+                for i in 0..l1.len().min(l2.len()) {
+                    let n1 = &l1[i];
+                    let n2 = &l2[i];
+                    match n1.partial_cmp(&n2) {
+                        None | Some(Ordering::Equal) => (),
+                        ord => return ord,
+                    }
+                }
+                Some(l1.len().cmp(&l2.len()))
+            }
+        }
+    }
+}
+
+impl From<&str> for Node {
+    fn from(line: &str) -> Self {
+        match line.split_once('[') {
+            None => Self::Number(line.parse().unwrap()),
+            Some(("", "]")) => Self::List(vec![]),
+            Some(("", r)) => match r.rsplit_once(']') {
+                Some((r, "")) => {
+                    let mut indentation = 0;
+                    Self::List(
+                        r.split(|c| match c {
+                            '[' => {
+                                indentation += 1;
+                                false
+                            }
+                            ']' => {
+                                indentation -= 1;
+                                false
+                            }
+                            ',' if indentation == 0 => true,
+                            _ => false,
+                        })
+                        .map(Into::into)
+                        .collect(),
+                    )
+                }
+                _ => panic!("missing closing parenthesis"),
+            },
+            _ => panic!("invalid input"),
+        }
+    }
+}
+
+fn parse_pair(lines: &mut Lines) -> Option<(Node, Node)> {
+    let [first, second] = &lines
+        .take_while(|line| !line.is_empty())
+        .map(Node::from)
+        .collect::<Vec<_>>()[..] else {return None;};
+    Some((first.clone(), second.clone()))
+}
+
+fn main() {
+    let input = "[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]"
+        .to_owned();
+    let input = read_to_string("input.txt").unwrap_or(input);
+    let mut input = input.lines();
+    let mut pairs = vec![];
+    while let Some(pair) = parse_pair(&mut input) {
+        pairs.push(pair);
+    }
+    let correct: usize = pairs
+        .iter()
+        .enumerate()
+        .filter_map(|(i, pair)| if pair.0 < pair.1 { Some(i + 1) } else { None })
+        .sum();
+    println!("{correct}");
+    let mut packets: Vec<_> = pairs.into_iter().flat_map(|p| [p.0, p.1]).collect();
+    packets.push("[[2]]".into());
+    packets.push("[[6]]".into());
+    packets.sort();
+    let decoder_key = (packets
+        .iter()
+        .position(|e| *e == Node::from("[[2]]"))
+        .unwrap()
+        + 1)
+        * (packets
+            .iter()
+            .position(|e| *e == Node::from("[[6]]"))
+            .unwrap()
+            + 1);
+    println!("{decoder_key}");
 }