From 2aa4ddb2382539cd3d78e5723174a139bc7edc41 Mon Sep 17 00:00:00 2001 From: Martin Ashby Date: Tue, 13 Dec 2022 22:34:32 +0000 Subject: day13 --- input/day13.txt | 449 +++++++++++++++++++++++++++++++++++++++++++++++++++++ input/day13_ex.txt | 23 +++ src/day13.rs | 115 ++++++++++++++ src/main.rs | 2 + 4 files changed, 589 insertions(+) create mode 100644 input/day13.txt create mode 100644 input/day13_ex.txt create mode 100644 src/day13.rs diff --git a/input/day13.txt b/input/day13.txt new file mode 100644 index 0000000..50b2eb6 --- /dev/null +++ b/input/day13.txt @@ -0,0 +1,449 @@ +[[[],[],8,3],[10]] +[[[[7],[0,4,6,1]],[[2,1,5,3,6],[]],[3,[10,9,1],2,[10,6,10],7],2,7],[5,[3],7,10,[8,[4,7,1,7,8],[],1,[8,6]]],[5,7,[[5,5,7,2,10],[8,7,10,4,7],[9,4,9,9,1]],[[8],8,5,[7,3,4,6,1],1]]] + +[[[5,5,[0,7,6,6,0]],[],0,9],[[[0,7,3,10,5],5],7],[10,[],1,[],5]] 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+[[[7,8,[8,2,10,2],[],[2]],3,9,0,1],[[[5]],0,7,[[7],2]],[[2,[],[8,5,4,1],9],5,6,[[1,2,8,0],4],[]],[2,[9,[],[10,10],8,[]],1]] + +[[],[],[[[5],[9],5,7],5,[]],[[3,[1,2,6,3],9,[3,2,7],0]],[[[5,9],5,[8,1,7]],[1,1,[7,7,8,10]]]] +[[[[10,0],[0,7,2]],3,[0,3,2,[7,1,9]],[[10],0,[5]],[[2,8,0,5],[7,3],4,10]],[9,[[]],[[],[1,4,4],7,[0,1,6,7,2],[6,9,0,4,4]],[9,[9]],[6,[4,5,0,8],1,[8,3,1,10],[9]]],[7,[[]],[5,[1,9,6]]]] + +[[4]] +[[5],[[2,[10,7,10,9,10],0]]] + +[[[],[[1,8,6,1,6],[3,2,1],2,[10,3,7,1,4],0],3,[3]],[9]] +[[],[],[[8],[[],5,[1,8,7],9,1],[[7,1,2,4,3],7,[5,7,1,6,6],8,2],10],[4,[6,[8,8,6,7]],1,[[],[5,10,3,2,7]]],[1,[],[1,[0],7,[9,0]]]] + +[[8],[2,[[9,2,9,9,10],[3,5,3,4]]],[10,[[10,7,10,0]],10,[[2,6],[4,9,6],[3,4,5,0,2],[]],7]] +[[4],[3],[],[10]] + +[[[[0],7,[1,1,10,2,0]],2,[[10,5,10]]],[[[6],[4,4,6]],[3,[]],9,[[8,3,3],[6],[9,5,7,7],8],10],[]] +[[6],[[[3,10]],[]],[8,10,[],9]] + +[[5,5,[],9]] +[[[[5,6,6,3]],2,[[4],0,7,2]],[[],[[10,5],[],[5],[8,1,0,3,2],3],[[7,3,0],5,0,4,[9,1]]]] + +[[],[[2],7,4],[2,9,10],[[[],[7,4,4,7,3]],[]]] +[[9],[]] + +[[[10,5,4,1,8],7,[5],[8]]] +[[0,10,[]],[],[0,6,[7,[4],[],[9]]],[4]] + +[[[8],[10],9,9]] +[[3,[[1,0,5,1,5]]]] + +[[[4,5,10],[7,[10,3,1],[2,6],10],[[6,0,8,9,6],4,[]],[]],[9,[],10]] +[[],[7],[10,10,[6]],[[[2,4],[6,2,2],0],6],[[[2,3,0,0,2],[6,5,7,2],2,4],6,6]] + +[[1],[[]],[[[9,1,9,5],[6],[9,3,5,2,6],9,[]],6,[],[[2],9,[8,3,1,3,1],[3,10,6]],[[0,9,1,8,2]]]] +[[[8],[[7],[7],5],5,5],[4,[[5,9,10],[]],[[4,7,5,1]],[[10,1,7]],4],[5,[[4,8,4],7,0],[2],[],[8,0,[5,8],[8,5,7,2,8],4]]] + +[[[0,[3,3,10],[],[0,9],5]],[[4,[],[7,2,5],[0,7],[0,10]]],[],[[[1,8]],[[9,7]],5,[[9,1,0,1],5,5,5,[10]],[[9,4,6,6],4,4,[2,6,9,4,7]]],[4]] +[[[[10,8,4,0],[9,10,1]],[],[],[[9,8,4,6],2,9],4],[[2,[6,7,8],10,[],[10,4,3,9]],[5,[9]],5,[6,[10],[7,3,6]],[]],[],[[[5,7],[9,7,7,6,9],[9,10,5],8],[[],3,[0,5,0]],3,6,6],[9,[7]]] \ No newline at end of file diff --git a/input/day13_ex.txt b/input/day13_ex.txt new file mode 100644 index 0000000..27c8912 --- /dev/null +++ b/input/day13_ex.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] \ No newline at end of file diff --git a/src/day13.rs b/src/day13.rs new file mode 100644 index 0000000..d2bd050 --- /dev/null +++ b/src/day13.rs @@ -0,0 +1,115 @@ +use std::cmp::Ordering; + +#[derive(Debug,Clone,PartialEq)] +enum Packet { + Num(i32), + Lst(Vec) +} + +impl Packet { + fn parse>(chrs: &mut T) -> Packet { + let mut numchrs = String::new(); + let mut children: Vec = Vec::new(); + loop { + match chrs.next() { + Some('[') => { + children.push(Packet::parse(chrs)); + }, + Some(']') | None => break, + Some(',') => { + if !numchrs.is_empty() { + children.push(Packet::Num(numchrs.parse().expect("chars wasn't a number!"))); + } + numchrs.clear(); + }, + Some(x) => { + numchrs.push(x); + }, + } + } + if !numchrs.is_empty() { + children.push(Packet::Num(numchrs.parse().expect("chars wasn't a number!"))); + } + Packet::Lst(children) + } + fn coerce_to_lst(&self) -> Packet { + match self { + Self::Lst(x) => Packet::Lst(x.to_vec()), + Self::Num(x) => Packet::Lst(vec![Packet::Num(*x)]) + } + } + fn rightorder(left: &Packet, right: &Self) -> Ordering { + if let (Packet::Num(x), Packet::Num(y)) = (left, right) { + if x < y { + Ordering::Less + } else if x == y { + Ordering::Equal + } else { + Ordering::Greater + } + } else if let (Packet::Lst(x), Packet::Lst(y)) = (left, right) { + for ix in 0..(x.len().max(y.len())) { + let maybe_xx = x.get(ix); + if maybe_xx.is_none() { + return Ordering::Less; + } + let maybe_yy = y.get(ix); + if maybe_yy.is_none() { + return Ordering::Greater; + } + let rr = Packet::rightorder(maybe_xx.unwrap(), maybe_yy.unwrap()); + match rr { + Ordering::Less | Ordering::Greater => return rr, + Ordering::Equal => {}, + } + } + Ordering::Equal + } else { + Packet::rightorder(&left.coerce_to_lst(), &right.coerce_to_lst()) + } + } +} + +pub fn run(input: String) { + // let x: i32 = input.lines().collect::>().split(|x| {x.is_empty()}) + // .enumerate() + // .map(|(ix, ps)| { + // if ps.len() != 2 { + // panic!("Expected pairs of packets, got {:?}", ps); + // } + // let ps1 = ps[0]; + // let ps2 = ps[1]; + // let p1 = Packet::parse(&mut ps1.chars().into_iter()); + // let p2 = Packet::parse(&mut ps2.chars().into_iter()); + // //println!("ps1 {} ps2 {} p1 {:?} p2 {:?}", ps1, ps2, p1, p2); + // match Packet::rightorder(&p1, &p2) { + // Ordering::Less => (ix+1) as i32, + // Ordering::Greater => 0 as i32, + // Ordering::Equal => panic!("2 identical packets????") + // } + // }) + // .sum(); + + // println!("Day 13: {}", x); + let mut zinput = String::from(" +[[2]] +[[6]] +"); + zinput.push_str(&input); + let mut packets = zinput.lines() + .filter(|x| {!x.is_empty()}) + .map(|x| {Packet::parse(&mut x.chars().into_iter())}) + .enumerate() + .collect::>(); + packets.sort_by(|(_, p1), (_, p2)| { Packet::rightorder(p1, p2)}); + let mut dp1: usize = 0; + let mut dp2: usize = 0; + for (nix, (oix, _)) in packets.into_iter().enumerate() { + if oix == 0 { + dp1 = nix+1; + } else if oix == 1 { + dp2 = nix+1; + } + } + println!("Day 13: {}", dp1*dp2); +} \ No newline at end of file diff --git a/src/main.rs b/src/main.rs index 885a516..0b427f1 100644 --- a/src/main.rs +++ b/src/main.rs @@ -14,6 +14,7 @@ mod day9; mod day10; mod day11; mod day12; +mod day13; fn main() { day1::run(fs::read_to_string("input/day1.txt").expect("Failed to read input file!")); @@ -28,4 +29,5 @@ fn main() { day10::run(fs::read_to_string("input/day10.txt").expect("Failed to read input file!")); day11::run(fs::read_to_string("input/day11.txt").expect("Failed to read input file!")); day12::run(fs::read_to_string("input/day12.txt").expect("Failed to read input file!")); + day13::run(fs::read_to_string("input/day13.txt").expect("Failed to read input file!")); } -- cgit v1.2.3-ZIG