26 files changed, 6270 insertions, 0 deletions

diff --git a/2022/.cargo/config.toml b/2022/.cargo/config.toml
new file mode 100644
index 0000000..435ed75
--- /dev/null
+++ b/2022/.cargo/config.toml
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\ No newline at end of file
diff --git a/2022/.gitignore b/2022/.gitignore
new file mode 100644
index 0000000..d7ecf3b
--- /dev/null
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\ No newline at end of file
diff --git a/2022/.gitlab-ci.yml b/2022/.gitlab-ci.yml
new file mode 100644
index 0000000..48a1625
--- /dev/null
+++ b/2022/.gitlab-ci.yml
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+    - ./trunk build -d public/day14 --release --public-url /aoc-2022/day14 src/day14.html
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+  cache:
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diff --git a/2022/Cargo.toml b/2022/Cargo.toml
new file mode 100644
index 0000000..3f1332d
--- /dev/null
+++ b/2022/Cargo.toml
@@ -0,0 +1,71 @@
+[package]
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+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
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+console_error_panic_hook = "^0.1"
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+
+[[bin]]
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+path = "src/day01.rs"
+
+[[bin]]
+name = "day2"
+path = "src/day02.rs"
+
+[[bin]]
+name = "day3"
+path = "src/day03.rs"
+
+[[bin]]
+name = "day4"
+path = "src/day04.rs"
+
+[[bin]]
+name = "day5"
+path = "src/day05.rs"
+
+[[bin]]
+name = "day6"
+path = "src/day06.rs"
+
+[[bin]]
+name = "day7"
+path = "src/day07.rs"
+
+[[bin]]
+name = "day8"
+path = "src/day08.rs"
+
+[[bin]]
+name = "day9"
+path = "src/day09.rs"
+
+[[bin]]
+name = "day10"
+path = "src/day10.rs"
+
+[[bin]]
+name = "day11"
+path = "src/day11.rs"
+
+[[bin]]
+name = "day12"
+path = "src/day12.rs"
+
+[[bin]]
+name = "day13"
+path = "src/day13.rs"
+
+[[bin]]
+name = "day14"
+path = "src/day14.rs"
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diff --git a/2022/fake_inputs/day14 b/2022/fake_inputs/day14
new file mode 100644
index 0000000..436b23f
--- /dev/null
+++ b/2022/fake_inputs/day14
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\ No newline at end of file
diff --git a/2022/fake_inputs/day9 b/2022/fake_inputs/day9
new file mode 100644
index 0000000..27249a2
--- /dev/null
+++ b/2022/fake_inputs/day9
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\ No newline at end of file
diff --git a/2022/flake.lock b/2022/flake.lock
new file mode 100644
index 0000000..6cd4e18
--- /dev/null
+++ b/2022/flake.lock
@@ -0,0 +1,147 @@
+{
+  "nodes": {
+    "crane": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "flake-utils": "flake-utils",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-overlay": "rust-overlay"
+      },
+      "locked": {
+        "lastModified": 1669853699,
+        "narHash": "sha256-SvyPRwJeET7PCifBOvu+reQUUlyc4Ya1K37GrtZyiXY=",
+        "owner": "ipetkov",
+        "repo": "crane",
+        "rev": "0428181b7b8f619e71095cf2fab051bccdf10041",
+        "type": "github"
+      },
+      "original": {
+        "owner": "ipetkov",
+        "repo": "crane",
+        "type": "github"
+      }
+    },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1650374568,
+        "narHash": "sha256-Z+s0J8/r907g149rllvwhb4pKi8Wam5ij0st8PwAh+E=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "b4a34015c698c7793d592d66adbab377907a2be8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1667395993,
+        "narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "locked": {
+        "lastModified": 1667395993,
+        "narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1669867399,
+        "narHash": "sha256-Z8RXSFYOsIsTG96ROKtV0eZ8Q7u4irFWm6ELqfw7mT8=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "38e591dd05ffc8bdf79dc752ba78b05e370416fa",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "crane": "crane",
+        "flake-utils": "flake-utils_2",
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay_2"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": [
+          "crane",
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "crane",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1667487142,
+        "narHash": "sha256-bVuzLs1ZVggJAbJmEDVO9G6p8BH3HRaolK70KXvnWnU=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "cf668f737ac986c0a89e83b6b2e3c5ddbd8cf33b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
+    "rust-overlay_2": {
+      "inputs": {
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1669862269,
+        "narHash": "sha256-/ar+cbAKAxd2Ng9b7EhrIMz9CP353RbmLecvyOidyUM=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "bfdf688742cf984c4837dbbe1c6cbca550365613",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/2022/flake.nix b/2022/flake.nix
new file mode 100644
index 0000000..7d55163
--- /dev/null
+++ b/2022/flake.nix
@@ -0,0 +1,72 @@
+{
+  description = "AOC 2022";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+
+    crane = {
+      url = "github:ipetkov/crane";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    flake-utils.url = "github:numtide/flake-utils";
+
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs = {
+        nixpkgs.follows = "nixpkgs";
+        flake-utils.follows = "flake-utils";
+      };
+    };
+  };
+
+  outputs = { self, nixpkgs, crane, flake-utils, rust-overlay, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [ (import rust-overlay) ];
+        };
+
+        toolchain = pkgs.rust-bin.nightly.latest.default.override {
+          targets = ["wasm32-unknown-unknown"];
+        };
+        craneLib = (crane.mkLib pkgs).overrideToolchain toolchain;
+        buildInputs = [
+            pkgs.cmake
+            pkgs.pkg-config
+            pkgs.fontconfig
+            pkgs.trunk
+        ];
+        my-crate = craneLib.buildPackage {
+          src = craneLib.cleanCargoSource ./.;
+          doCheck = false;
+
+          buildInputs = buildInputs ++ pkgs.lib.optionals pkgs.stdenv.isDarwin [
+            # Additional darwin specific inputs can be set here
+            pkgs.libiconv
+          ];
+        };
+      in
+      {
+        checks = {
+          inherit my-crate;
+        };
+
+        packages.default = my-crate;
+
+        apps.default = flake-utils.lib.mkApp {
+          drv = my-crate;
+        };
+
+        devShells.default = pkgs.mkShell {
+          inputsFrom = builtins.attrValues self.checks;
+
+          nativeBuildInputs = buildInputs ++ (with pkgs; [
+            (toolchain.override {
+              extensions = ["rust-analyzer" "rust-src" "miri"];
+            })
+          ]);
+        };
+      });
+}
diff --git a/2022/src/day01.rs b/2022/src/day01.rs
new file mode 100644
index 0000000..a328975
--- /dev/null
+++ b/2022/src/day01.rs
@@ -0,0 +1,21 @@
+use crate::utils::max_n;
+
+mod utils;
+
+fn main() {
+    let input = utils::read_input();
+
+    let mut elf_cal_counts: Vec<usize> = input
+        .split("\n\n")
+        .map(|xs| {
+            xs.lines()
+                .map(|x| x.parse::<usize>().unwrap())
+                .sum::<usize>()
+        })
+        .collect();
+
+    let top_3 = max_n(&mut elf_cal_counts, 3);
+
+    println!("Max: {}", top_3.last().unwrap());
+    println!("Sum of top 3: {}", top_3.iter().sum::<usize>());
+}
diff --git a/2022/src/day02.rs b/2022/src/day02.rs
new file mode 100644
index 0000000..d0b0c5f
--- /dev/null
+++ b/2022/src/day02.rs
@@ -0,0 +1,105 @@
+mod utils;
+
+use utils::read_input;
+
+fn main() {
+    let input = read_input();
+
+    let turns_both_moves: Vec<_> = input
+        .lines()
+        .map(|xs| {
+            let mut parts = xs.split(' ').take(2).map(Move::parse);
+            (parts.next().unwrap(), parts.next().unwrap())
+        })
+        .collect();
+
+    let total_score_p1: usize = turns_both_moves
+        .iter()
+        .map(|(them, us)| score(*them, *us))
+        .sum();
+
+    let total_score_p2: usize = turns_both_moves
+        .into_iter()
+        .map(|(them, us)| (them, us.to_outcome()))
+        .map(|(them, outcome)| (them, them.to_get(outcome)))
+        .map(|(them, us)| score(them, us))
+        .sum();
+
+    println!("Part 1: {}", total_score_p1);
+    println!("Part 2: {}", total_score_p2);
+}
+
+fn score(them: Move, us: Move) -> usize {
+    let won_val = match (them.beats(us), us.beats(them)) {
+        (true, false) => 0,
+        (false, true) => 6,
+        (false, false) => 3,
+        (a, b) => unreachable!("they beat us: {}, we beat them: {}", a, b),
+    };
+    us.value() + won_val
+}
+
+#[derive(Debug, Clone, Copy)]
+enum Move {
+    Rock,
+    Paper,
+    Scissors,
+}
+
+impl Move {
+    fn parse(inp: &str) -> Self {
+        match inp {
+            "A" => Move::Rock,
+            "B" => Move::Paper,
+            "C" => Move::Scissors,
+            "X" => Move::Rock,
+            "Y" => Move::Paper,
+            "Z" => Move::Scissors,
+            _ => panic!("unrecognised move: {}", inp),
+        }
+    }
+
+    fn to_outcome(self) -> Outcome {
+        match self {
+            Move::Rock => Outcome::Lose,
+            Move::Paper => Outcome::Draw,
+            Move::Scissors => Outcome::Win,
+        }
+    }
+
+    fn beats(self, other: Move) -> bool {
+        matches!(
+            (self, other),
+            (Move::Paper, Move::Rock)
+                | (Move::Rock, Move::Scissors)
+                | (Move::Scissors, Move::Paper)
+        )
+    }
+
+    fn to_get(self, outcome: Outcome) -> Self {
+        match (self, outcome) {
+            (_, Outcome::Draw) => self,
+            (Move::Rock, Outcome::Win) => Move::Paper,
+            (Move::Paper, Outcome::Win) => Move::Scissors,
+            (Move::Scissors, Outcome::Win) => Move::Rock,
+            (Move::Rock, Outcome::Lose) => Move::Scissors,
+            (Move::Paper, Outcome::Lose) => Move::Rock,
+            (Move::Scissors, Outcome::Lose) => Move::Paper,
+        }
+    }
+
+    fn value(self) -> usize {
+        match self {
+            Move::Rock => 1,
+            Move::Paper => 2,
+            Move::Scissors => 3,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy)]
+enum Outcome {
+    Win,
+    Draw,
+    Lose,
+}
diff --git a/2022/src/day03.rs b/2022/src/day03.rs
new file mode 100644
index 0000000..7e245de
--- /dev/null
+++ b/2022/src/day03.rs
@@ -0,0 +1,62 @@
+mod utils;
+
+use std::collections::HashSet;
+
+use utils::read_input;
+
+fn main() {
+    let input = read_input();
+
+    // Convert each line to a tuple of hashsets, one for each backpack pocket
+    let rucksack_items: Vec<_> = input
+        .lines()
+        .map(|line| (&line[..line.len() / 2], &line[line.len() / 2..]))
+        .map(|(a, b)| -> (HashSet<char>, HashSet<char>) {
+            (a.chars().collect(), b.chars().collect())
+        })
+        .collect();
+
+    let sum_error_priorities: u32 = rucksack_items
+        .iter()
+        .map(|(a, b)| {
+            *a.intersection(b)
+                .next()
+                .expect("no common item between two backpack segments!")
+        }) // Get common item
+        .map(priority)
+        .sum();
+
+    let sum_badge_priorities: u32 = rucksack_items // Construct chunked iterator
+        .iter()
+        .step_by(3)
+        .zip(rucksack_items.iter().skip(1).step_by(3))
+        .zip(rucksack_items.iter().skip(2).step_by(3))
+        .map(|(((e1l, e1r), (e2l, e2r)), (e3l, e3r))| {
+            for item in e1l.union(e1r) {
+                if (e2l.contains(item) || e2r.contains(item))
+                    && (e3l.contains(item) || e3r.contains(item))
+                {
+                    return *item;
+                }
+            }
+            panic!(
+                "group has no badge! {:?}",
+                ((e1l, e1r), (e2l, e2r), (e3l, e3r))
+            )
+        })
+        .map(priority)
+        .sum();
+
+    println!("Part 1: {}", sum_error_priorities);
+    println!("Part 2: {}", sum_badge_priorities);
+}
+
+fn priority(chr: char) -> u32 {
+    if chr.is_ascii_lowercase() {
+        chr as u32 - 96
+    } else if chr.is_ascii_uppercase() {
+        chr as u32 - 38
+    } else {
+        panic!("unrecognised item {}", chr)
+    }
+}
diff --git a/2022/src/day04.rs b/2022/src/day04.rs
new file mode 100644
index 0000000..052dde1
--- /dev/null
+++ b/2022/src/day04.rs
@@ -0,0 +1,35 @@
+mod utils;
+
+use std::ops::RangeInclusive;
+
+use utils::{iter_pair, read_input};
+
+fn main() {
+    let input = read_input();
+
+    let pairs = input.lines().map(|x| {
+        iter_pair(x.split(',').map(|x| -> RangeInclusive<usize> {
+            let (start, end) = iter_pair(x.split('-'));
+            start.parse().unwrap()..=end.parse().unwrap()
+        }))
+    });
+
+    let (fully_contains, partially_contains) = pairs
+        .map(|(a, b)| (fully_overlap(&a, &b), partially_overlap(&a, &b)))
+        .fold((0, 0), |(acc_full, acc_part), (full, part)| {
+            (acc_full + full as usize, acc_part + part as usize)
+        });
+
+    println!("Part 1: {}", fully_contains);
+    println!("Part 2: {}", partially_contains);
+}
+
+#[inline(always)]
+fn fully_overlap<T: PartialOrd>(a: &RangeInclusive<T>, b: &RangeInclusive<T>) -> bool {
+    (a.contains(b.start()) && a.contains(b.end())) || (b.contains(a.start()) && b.contains(a.end()))
+}
+
+#[inline(always)]
+fn partially_overlap<T: PartialOrd>(a: &RangeInclusive<T>, b: &RangeInclusive<T>) -> bool {
+    a.contains(b.start()) || a.contains(b.end()) || b.contains(a.start()) || b.contains(a.end())
+}
diff --git a/2022/src/day05.rs b/2022/src/day05.rs
new file mode 100644
index 0000000..f45cd0a
--- /dev/null
+++ b/2022/src/day05.rs
@@ -0,0 +1,145 @@
+//! Day 5: Supply Stacks
+
+extern crate bumpalo;
+
+mod utils;
+
+use bumpalo::Bump;
+use std::cell::Cell;
+use utils::{parse_num, parse_static, read_input};
+
+/// Base type for a crate
+#[derive(Debug, Clone)]
+struct Crate<'a> {
+    letter: char,
+    below: Cell<Option<&'a Crate<'a>>>,
+}
+
+impl Default for Crate<'_> {
+    fn default() -> Self {
+        Crate {
+            letter: ' ',
+            below: None.into(),
+        }
+    }
+}
+
+/// A move the crane may make
+#[derive(Debug, Clone, Copy)]
+struct Move {
+    reps: usize,
+    from: usize,
+    to: usize,
+}
+type Tops<'arena> = Vec<Option<&'arena Crate<'arena>>>;
+
+fn main() {
+    let input = read_input();
+
+    {
+        let arena = Bump::new();
+        let mut tops = construct_piles(&input, &arena);
+        for mv in parse_moves(&input) {
+            perform_move_9000(&mut tops, mv);
+        }
+
+        println!("Part 1: {}", top_letters(tops));
+    }
+
+    {
+        let arena = Bump::new();
+        let mut tops = construct_piles(&input, &arena);
+        for mv in parse_moves(&input) {
+            perform_move_9001(&mut tops, mv);
+        }
+
+        println!("Part 2: {}", top_letters(tops));
+    }
+}
+
+/// Get the message / the top letters of each stack
+fn top_letters(tops: Tops<'_>) -> String {
+    tops.iter().map(|x| x.as_ref().unwrap().letter).collect()
+}
+
+/// Perform a move for part 1
+fn perform_move_9000(tops: &mut Tops<'_>, mv: Move) {
+    for _ in 0..mv.reps {
+        let from = tops[mv.from].take().unwrap();
+        let to = tops[mv.to].take();
+
+        tops[mv.from] = from.below.replace(to);
+        tops[mv.to] = Some(from);
+    }
+}
+
+/// Perform a move for part 2
+fn perform_move_9001(tops: &mut Tops<'_>, mv: Move) {
+    let pickup_top = tops[mv.from].take().unwrap();
+
+    let mut pickup_bot = pickup_top;
+    for _ in 1..mv.reps {
+        pickup_bot = pickup_bot.below.get().as_ref().unwrap();
+    }
+
+    let to = tops[mv.to].take();
+
+    tops[mv.from] = pickup_bot.below.replace(to);
+    tops[mv.to] = Some(pickup_top);
+}
+
+// Annoying parsing code!
+
+fn construct_piles<'a>(input: &str, arena: &'a Bump) -> Tops<'a> {
+    let mut piles = Vec::new();
+    for layer_iter in input
+        .lines()
+        .take_while(|x| x.chars().find(|x| *x != ' ').unwrap() == '[')
+        .map(|x| x.chars().skip(1).step_by(4))
+    {
+        for (stack, chr) in layer_iter.enumerate() {
+            if piles.len() < stack + 1 {
+                piles.resize(stack + 1, None);
+            }
+
+            if chr != ' ' {
+                let val = &*arena.alloc(Crate {
+                    letter: chr,
+                    below: None.into(),
+                });
+                if piles[stack].is_none() {
+                    piles[stack] = Some(val);
+                } else {
+                    let mut top = *piles[stack].as_ref().unwrap();
+                    while let Some(below) = top.below.get() {
+                        top = below;
+                    }
+
+                    top.below.set(Some(val));
+                }
+            }
+        }
+    }
+
+    piles
+}
+
+fn parse_moves(input: &str) -> impl Iterator<Item = Move> + '_ {
+    input
+        .lines()
+        .skip_while(|line| !line.starts_with('m'))
+        .map(|line| {
+            let line = parse_static("move ", line);
+            let (reps, line) = parse_num(line);
+            let line = parse_static(" from ", line);
+            let (from, line) = parse_num::<usize>(line);
+            let line = parse_static(" to ", line);
+            let (to, _) = parse_num::<usize>(line);
+
+            Move {
+                reps,
+                from: from - 1,
+                to: to - 1,
+            }
+        })
+}
diff --git a/2022/src/day06.rs b/2022/src/day06.rs
new file mode 100644
index 0000000..8bbfe6d
--- /dev/null
+++ b/2022/src/day06.rs
@@ -0,0 +1,47 @@
+mod utils;
+use utils::read_input;
+
+fn main() {
+    let input = read_input();
+
+    println!("Part 1: {}", find_chunk_nodup::<4>(&input));
+    println!("Part 2: {}", find_chunk_nodup::<14>(&input));
+}
+
+fn find_chunk_nodup<const N: usize>(input: &str) -> usize {
+    let mut window = ['a'; N];
+    let mut chars = input.chars();
+
+    // Fill up initial window
+    for item in window.iter_mut() {
+        *item = chars.next().unwrap();
+    }
+
+    for i in 0..input.len() {
+        // Shuffle everything in window down
+        for j in 0..N - 1 {
+            window[j] = window[j + 1];
+        }
+        window[N - 1] = chars.next().unwrap();
+
+        if window
+            .iter()
+            .fold(Some(0), |acc, chr| add_char(acc?, *chr))
+            .is_some()
+        {
+            return i + N + 1;
+        }
+    }
+
+    panic!("no solution!")
+}
+
+#[inline]
+fn add_char(bits: u32, chr: char) -> Option<u32> {
+    let add = 1 << (chr.to_ascii_lowercase() as u32 - 97);
+    if (bits | add) != bits {
+        Some(bits | add)
+    } else {
+        None
+    }
+}
diff --git a/2022/src/day07.rs b/2022/src/day07.rs
new file mode 100644
index 0000000..88bb647
--- /dev/null
+++ b/2022/src/day07.rs
@@ -0,0 +1,110 @@
+mod utils;
+use utils::read_input;
+
+fn main() {
+    let input = read_input();
+
+    let mut unused = 0;
+    let mut sum_under_threshold = 0;
+
+    for size in DirectorySizes::new(&input) {
+        if size < 100_000 {
+            sum_under_threshold += size;
+        }
+        unused = 70_000_000 - size;
+    }
+
+    println!("Part 1: {}", sum_under_threshold);
+    let deficit = 30_000_000 - unused;
+    println!(
+        "Part 2: {}",
+        DirectorySizes::new(&input)
+            .filter(|x| *x > deficit)
+            .min()
+            .unwrap()
+    );
+}
+
+struct DirectorySizes<'a> {
+    lines: std::str::Lines<'a>,
+    directory_stack: [usize; 64],
+    stack_top: usize,
+}
+
+impl<'a> DirectorySizes<'a> {
+    fn new(input: &'a str) -> Self {
+        let mut lines = input.lines();
+        assert_eq!(lines.next(), Some("$ cd /"));
+
+        DirectorySizes {
+            lines,
+            directory_stack: [0; 64],
+            stack_top: 0,
+        }
+    }
+}
+
+impl Iterator for DirectorySizes<'_> {
+    type Item = usize;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        for line in self.lines.by_ref() {
+            let line: Line = line.into();
+
+            match line {
+                Line::Cd(up) => {
+                    if up {
+                        self.directory_stack[self.stack_top - 1] +=
+                            self.directory_stack[self.stack_top];
+                        self.stack_top -= 1;
+                        return Some(self.directory_stack[self.stack_top + 1]);
+                    } else {
+                        self.stack_top += 1;
+                        self.directory_stack[self.stack_top] = 0;
+                    }
+                }
+                Line::FileSize(size) => {
+                    self.directory_stack[self.stack_top] += size;
+                }
+                Line::Ls => (),
+                Line::Dir => (),
+            };
+        }
+
+        if self.stack_top > 0 {
+            self.directory_stack[self.stack_top - 1] += self.directory_stack[self.stack_top];
+            self.stack_top -= 1;
+            Some(self.directory_stack[self.stack_top + 1])
+        } else if self.directory_stack[0] != 0 {
+            Some(std::mem::replace(&mut self.directory_stack[0], 0))
+        } else {
+            None
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy)]
+enum Line {
+    /// True = .., False = other
+    Cd(bool),
+    Ls,
+    FileSize(usize),
+    Dir,
+}
+
+impl From<&str> for Line {
+    fn from(value: &str) -> Self {
+        if value.starts_with("$ cd ") {
+            let mut args = value.split("cd ");
+            args.next().unwrap();
+            Line::Cd(args.next().unwrap() == "..")
+        } else if value.starts_with("$ ls") {
+            Line::Ls
+        } else if value.starts_with("dir") {
+            Line::Dir
+        } else {
+            let num_index = value.chars().take_while(|chr| chr.is_numeric()).count();
+            Line::FileSize(value[..num_index].parse().unwrap())
+        }
+    }
+}
diff --git a/2022/src/day08.rs b/2022/src/day08.rs
new file mode 100644
index 0000000..514cb21
--- /dev/null
+++ b/2022/src/day08.rs
@@ -0,0 +1,110 @@
+mod utils;
+
+use utils::read_input;
+
+fn main() {
+    let input = read_input();
+
+    let mut grid: Vec<Vec<_>> = input
+        .lines()
+        .map(|x| {
+            x.chars()
+                .map(|x| (x.to_digit(10).unwrap() as u8, false))
+                .collect()
+        })
+        .collect();
+    in_all_directions!(check_vis_along_run, grid);
+
+    println!(
+        "Part 1: {}",
+        grid.iter()
+            .map(|x| x.iter().filter(|x| x.1).count())
+            .sum::<usize>()
+    );
+
+    let mut grid: Vec<Vec<(u8, u32)>> = grid
+        .into_iter()
+        .map(|x| x.into_iter().map(|(x, _)| (x, 1)).collect())
+        .collect();
+    in_all_directions!(vis_score_along_run, grid);
+
+    println!(
+        "Part 2: {}",
+        grid.iter()
+            .map(|row| row.iter().map(|(_, vis)| vis).max().unwrap())
+            .max()
+            .unwrap()
+    );
+}
+
+fn check_vis_along_run(
+    mut run: impl Iterator<Item = (usize, usize)>,
+    grid: &mut [Vec<(u8, bool)>],
+) {
+    let mut curr_height = {
+        let (row_idx, col_idx) = run.next().unwrap();
+
+        grid[row_idx][col_idx].1 = true;
+
+        grid[row_idx][col_idx].0
+    };
+    for (row_idx, col_idx) in run {
+        let height = grid[row_idx][col_idx].0;
+        if height > curr_height {
+            curr_height = height;
+            grid[row_idx][col_idx].1 = true;
+        }
+    }
+}
+
+fn vis_score_along_run(run: impl Iterator<Item = (usize, usize)>, grid: &mut [Vec<(u8, u32)>]) {
+    let mut next_values = [0; 10];
+    for (row_idx, col_idx) in run {
+        let height = grid[row_idx][col_idx].0;
+        grid[row_idx][col_idx].1 *= next_values[height as usize];
+
+        for (val, score) in next_values.iter_mut().enumerate() {
+            *score = if *score == 0 || val > height as usize {
+                *score + 1
+            } else {
+                1
+            };
+        }
+    }
+}
+
+#[macro_use]
+mod codegen {
+    #[macro_export]
+    macro_rules! in_all_directions {
+        ($f:ident, $grid: ident) => {
+            let grid_rows = $grid.len();
+            let grid_cols = $grid[0].len();
+
+            (0..grid_rows).for_each(|grid_row| {
+                $f(
+                    (0..grid_cols).map(move |grid_col| (grid_row, grid_col)),
+                    &mut $grid,
+                );
+                $f(
+                    (0..grid_cols)
+                        .rev()
+                        .map(move |grid_col| (grid_row, grid_col)),
+                    &mut $grid,
+                )
+            });
+            (0..grid_cols).for_each(|grid_col| {
+                $f(
+                    (0..grid_rows).map(move |grid_row| (grid_row, grid_col)),
+                    &mut $grid,
+                );
+                $f(
+                    (0..grid_rows)
+                        .rev()
+                        .map(move |grid_row| (grid_row, grid_col)),
+                    &mut $grid,
+                )
+            });
+        };
+    }
+}
diff --git a/2022/src/day09.html b/2022/src/day09.html
new file mode 100644
index 0000000..d3ed12b
--- /dev/null
+++ b/2022/src/day09.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+	<link data-trunk rel="rust" data-wasm-opt="2" href="../Cargo.toml" data-bin="day9" />
+
+	<style>
+		html {
+			/* Remove touch delay: */
+			touch-action: manipulation;
+		}
+
+		html,
+		body {
+			overflow: hidden;
+			margin: 0 !important;
+			padding: 0 !important;
+			height: 100%;
+			width: 100%;
+		}
+
+		canvas {
+			margin-right: auto;
+			margin-left: auto;
+			display: block;
+			position: absolute;
+			top: 0%;
+			left: 50%;
+			transform: translate(-50%, 0%);
+		}
+	</style>
+</head>
+
+<body>
+	<canvas id="canvas"></canvas>
+</body>
+
+</html>
diff --git a/2022/src/day09.rs b/2022/src/day09.rs
new file mode 100644
index 0000000..23b08b3
--- /dev/null
+++ b/2022/src/day09.rs
@@ -0,0 +1,238 @@
+mod utils;
+use std::{
+    cmp::min,
+    collections::{HashSet, VecDeque},
+    time::Duration,
+};
+
+use egui::{Color32, Sense, Stroke};
+use utils::{iter_pair, read_input};
+
+#[cfg(target_arch = "wasm32")]
+fn main() {
+    console_error_panic_hook::set_once();
+
+    let input = include_str!("../fake_inputs/day9");
+    let input = parse_moves(&input).collect();
+
+    let options = eframe::WebOptions::default();
+    wasm_bindgen_futures::spawn_local(async {
+        eframe::start_web("canvas", options, Box::new(|_cc| Box::new(App::new(input))))
+            .await
+            .expect("unable to start eframe");
+    });
+}
+
+#[cfg(not(target_arch = "wasm32"))]
+fn main() {
+    let input = read_input();
+
+    println!("Part 1: {}", visited_from_moves::<2>(parse_moves(&input)));
+    println!("Part 2: {}", visited_from_moves::<10>(parse_moves(&input)));
+}
+
+type Pos = (i32, i32);
+type Move = (Direction, u8);
+
+fn visited_from_moves<const N: usize>(moves: impl Iterator<Item = Move>) -> usize {
+    let mut tail_visited = HashSet::new();
+    tail_visited.insert((0, 0));
+    let mut knots = [(0, 0); N];
+    for mv in moves {
+        make_move(mv, &mut knots, &mut tail_visited);
+    }
+
+    tail_visited.len()
+}
+
+fn make_move(mv: Move, knots: &mut [Pos], tail_visited: &mut HashSet<Pos>) {
+    let (dir, count) = mv;
+
+    for _ in 0..count {
+        // Move head of rope
+        match dir {
+            Direction::Up => knots[0].1 += 1,
+            Direction::Down => knots[0].1 -= 1,
+            Direction::Right => knots[0].0 += 1,
+            Direction::Left => knots[0].0 -= 1,
+        };
+
+        for front_idx in 0..knots.len() - 1 {
+            let (fx, fy) = knots[front_idx];
+            let (bx, by) = &mut knots[front_idx + 1];
+            let (dx, dy) = (fx - *bx, fy - *by);
+            if (dx.abs() == 2 && dy == 0) || (dy.abs() == 2 && dx == 0) || (dy.abs() + dx.abs() > 2)
+            {
+                *bx += (dx.signum()) * min(dx.abs(), 1);
+                *by += (dy.signum()) * min(dy.abs(), 1);
+            }
+        }
+        tail_visited.insert(knots[knots.len() - 1]);
+    }
+}
+
+fn parse_moves(input: &str) -> impl Iterator<Item = Move> + '_ {
+    input.lines().map(|x| {
+        let (dir, count) = iter_pair(x.split(' '));
+        let count = count.parse().unwrap();
+
+        (
+            match dir {
+                "L" => Direction::Left,
+                "R" => Direction::Right,
+                "U" => Direction::Up,
+                "D" => Direction::Down,
+                _ => panic!("invalid direction, {}", dir),
+            },
+            count,
+        )
+    })
+}
+
+#[derive(Debug, Clone, Copy)]
+enum Direction {
+    Up,
+    Down,
+    Left,
+    Right,
+}
+
+struct App {
+    orig_input: VecDeque<Move>,
+    input: VecDeque<Move>,
+    knots: Vec<Pos>,
+    tail_visited: HashSet<Pos>,
+    desired_knot_count: usize,
+    speed: usize,
+}
+
+impl App {
+    fn new(input: VecDeque<Move>) -> Self {
+        App {
+            orig_input: input.clone(),
+            input,
+            knots: vec![],
+            tail_visited: HashSet::new(),
+            desired_knot_count: 2,
+            speed: 0,
+        }
+    }
+
+    fn reset_knots(&mut self) {
+        self.input = self.orig_input.clone();
+        self.knots = vec![(0, 0); self.desired_knot_count];
+        self.tail_visited.clear();
+        self.tail_visited.insert((0, 0));
+    }
+
+    fn step(&mut self) {
+        match self.input.pop_front() {
+            Some(mv) => make_move(mv, &mut self.knots, &mut self.tail_visited),
+            None => (),
+        }
+    }
+}
+
+impl eframe::App for App {
+    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        if self.desired_knot_count != self.knots.len() {
+            self.reset_knots()
+        }
+        egui::SidePanel::right("instructions").show(ctx, |ui| {
+            egui::ScrollArea::vertical().show(ui, |ui| {
+                if ui.button("Step").clicked() {
+                    self.step();
+                }
+                if ui.button("Reset").clicked() {
+                    self.reset_knots()
+                }
+                ui.label(format!("Tail Visited: {}", self.tail_visited.len()));
+                ui.add(egui::Slider::new(&mut self.desired_knot_count, 2..=20).text("Knot count"));
+                ui.add(egui::Slider::new(&mut self.speed, 0..=20).text("Speed"));
+                ui.heading("Instructions:");
+                for (i, ins) in self.input.iter().take(20).enumerate() {
+                    let arrow = match ins.0 {
+                        Direction::Up => "⬆",
+                        Direction::Down => "⬇",
+                        Direction::Right => "➡",
+                        Direction::Left => "⬅",
+                    };
+                    if i == 0 {
+                        ui.colored_label(Color32::YELLOW, arrow.repeat(ins.1 as _));
+                    } else {
+                        ui.label(arrow.repeat(ins.1 as _));
+                    }
+                }
+                if self.input.len() > 20 {
+                    ui.label(format!("+ {} more", self.input.len() - 20));
+                }
+            })
+        });
+
+        if self.speed > 0 && self.input.len() > 0 {
+            for _ in 0..self.speed {
+                self.step();
+            }
+            ctx.request_repaint_after(Duration::from_millis(100))
+        }
+
+        egui::CentralPanel::default().show(ctx, |ui| {
+            let mut painter_size = ui.available_size_before_wrap();
+            if !painter_size.is_finite() {
+                painter_size = egui::vec2(500.0, 500.0);
+            }
+
+            const SIDE: f32 = 5.0;
+
+            let (res, painter) = ui.allocate_painter(painter_size, Sense::hover());
+            let center = res.rect.center().to_vec2();
+
+            let to_panel_pos = |pos: &Pos| {
+                (egui::vec2(pos.0 as f32 * SIDE, pos.1 as f32 * SIDE) + center).to_pos2()
+            };
+
+            let half_width = (painter_size.x / SIDE).floor() as i32;
+            let half_height = (painter_size.y / SIDE).floor() as i32;
+
+            for x in -half_width..half_width {
+                for y in -half_height..half_height {
+                    let dot = (x, y);
+                    let color = if dot == (0, 0) {
+                        Color32::WHITE
+                    } else if self.tail_visited.contains(&dot) {
+                        Color32::DARK_RED
+                    } else {
+                        continue;
+                    };
+
+                    let dot_pos = to_panel_pos(&dot);
+                    painter.circle_stroke(dot_pos, 1.0, Stroke::new(1.0, color));
+                }
+            }
+
+            // paint the head
+            painter.circle_stroke(
+                to_panel_pos(&self.knots[0]),
+                SIDE / 2.0,
+                Stroke::new(SIDE / 2.0, Color32::GREEN),
+            );
+            for knot in self.knots.iter().skip(1) {
+                painter.circle_stroke(
+                    to_panel_pos(knot),
+                    SIDE / 2.0,
+                    Stroke::new(SIDE / 2.0, Color32::YELLOW),
+                );
+            }
+
+            for (a, b) in self.knots.iter().zip(self.knots.iter().skip(1)) {
+                let head_pos = to_panel_pos(a);
+                let tail_pos = to_panel_pos(b);
+                painter.arrow(
+                    tail_pos,
+                    head_pos - tail_pos,
+                    Stroke::new(1.0, Color32::YELLOW),
+                )
+            }
+        });
+    }
+}
diff --git a/2022/src/day10.rs b/2022/src/day10.rs
new file mode 100644
index 0000000..4c74444
--- /dev/null
+++ b/2022/src/day10.rs
@@ -0,0 +1,82 @@
+mod utils;
+use utils::{parse_num, parse_static, read_input};
+
+fn main() {
+    let input = read_input();
+
+    let mut cmds = input.lines().map(parse_cmd);
+    let mut state = State {
+        x: 1,
+        add_next: None,
+        add_next_start: None,
+        crt_pos: 0,
+    };
+
+    let mut acc = 0;
+    run_steps::<20>(&mut state, &mut cmds);
+    acc += state.x * 20;
+    for i in 1..=5 {
+        run_steps::<40>(&mut state, &mut cmds);
+        acc += state.x * (20 + (i * 40));
+    }
+
+    run_steps::<{ TOTAL_STEPS - 220 }>(&mut state, &mut cmds);
+
+    println!("Part 1: {}", acc);
+}
+
+struct State {
+    x: isize,
+    add_next: Option<isize>,
+    add_next_start: Option<isize>,
+    crt_pos: usize,
+}
+
+const CRT_WIDTH: usize = 40;
+const CRT_HEIGHT: usize = 6;
+const TOTAL_STEPS: usize = CRT_WIDTH * CRT_HEIGHT;
+
+fn run_steps<const N: usize>(state: &mut State, cmd: &mut impl Iterator<Item = Command>) {
+    for _ in 0..N {
+        if let Some(add) = state.add_next_start.take() {
+            state.x += add;
+        }
+
+        if (state.x - (state.crt_pos % CRT_WIDTH) as isize).abs() < 2 {
+            print!("█");
+        } else {
+            print!(" ");
+        }
+        state.crt_pos += 1;
+        if (state.crt_pos % CRT_WIDTH) == 0 {
+            println!();
+        }
+
+        if let Some(add) = state.add_next.take() {
+            state.add_next_start = Some(add);
+        } else {
+            match cmd.next() {
+                Some(Command::NoOp) => (),
+                Some(Command::AddX(add)) => state.add_next = Some(add),
+                None => (),
+            }
+        }
+    }
+}
+
+fn parse_cmd(cmd: &str) -> Command {
+    if cmd == "noop" {
+        Command::NoOp
+    } else {
+        let cmd = parse_static("addx ", cmd);
+        let (add, _) = parse_num(cmd);
+
+        Command::AddX(add)
+    }
+}
+
+#[derive(Debug)]
+enum Command {
+    NoOp,
+    AddX(isize),
+}
diff --git a/2022/src/day11.rs b/2022/src/day11.rs
new file mode 100644
index 0000000..aad0b48
--- /dev/null
+++ b/2022/src/day11.rs
@@ -0,0 +1,127 @@
+mod utils;
+extern crate nom;
+use nom::{
+    branch::alt,
+    bytes::complete::{tag, take_until},
+    character::complete::{digit0, u32},
+    multi::separated_list0,
+    IResult,
+};
+use utils::{max_n, read_input};
+
+fn main() {
+    let input = read_input();
+
+    let (_, monkeys_items) = separated_list0(tag("\n\n"), Monkey::parse)(&input).unwrap();
+    let (monkeys, items): (Vec<_>, Vec<_>) = monkeys_items.into_iter().unzip();
+
+    println!(
+        "Part 1: {}",
+        monkey_business::<3, 20>(&monkeys, items.clone(), usize::MAX),
+    );
+    println!(
+        "Part 2: {}",
+        monkey_business::<1, 10000>(&monkeys, items, monkeys.iter().map(|x| x.test).product())
+    );
+}
+
+fn monkey_business<const REDUCER: usize, const ROUNDS: usize>(
+    monkeys: &[Monkey],
+    mut items: Vec<Vec<usize>>,
+    additional_reducer: usize,
+) -> usize {
+    let mut inspections = vec![0; monkeys.len()];
+    for _ in 0..ROUNDS {
+        for monkey_idx in 0..monkeys.len() {
+            let curr_monkey = &monkeys[monkey_idx];
+            while let Some(worry) = items[monkey_idx].pop() {
+                let new_worry = (curr_monkey.do_op(worry) / REDUCER) % additional_reducer;
+                inspections[monkey_idx] += 1;
+                let throw_to = curr_monkey.throw_to(new_worry);
+
+                items[throw_to].push(new_worry);
+            }
+        }
+    }
+
+    max_n(&mut inspections, 2).iter().product::<usize>()
+}
+
+#[derive(Debug)]
+struct Monkey {
+    op: Operation,
+    test: usize,
+    next_monkey: (usize, usize),
+}
+
+impl Monkey {
+    fn parse(i: &str) -> IResult<&str, (Monkey, Vec<usize>)> {
+        let (i, _) = tag("Monkey ")(i)?;
+        let (i, _) = digit0(i)?;
+        let (i, _) = tag(":\n  Starting items: ")(i)?;
+        let (i, items) = separated_list0(tag(", "), u32)(i)?;
+        let (i, _) = tag("\n  Operation: new = ")(i)?;
+        let (i, op) = Operation::parse(i)?;
+        let (i, _) = take_until("\n")(i)?;
+        let (i, _) = tag("\n  Test: divisible by ")(i)?;
+        let (i, test) = u32(i)?;
+        let (i, _) = tag("\n    If true: throw to monkey ")(i)?;
+        let (i, monkey_t) = u32(i)?;
+        let (i, _) = tag("\n    If false: throw to monkey ")(i)?;
+        let (i, monkey_f) = u32(i)?;
+
+        Ok((
+            i,
+            (
+                Monkey {
+                    op,
+                    test: test as usize,
+                    next_monkey: (monkey_t as usize, monkey_f as usize),
+                },
+                items.into_iter().map(|x| x as usize).collect(),
+            ),
+        ))
+    }
+
+    fn do_op(&self, x: usize) -> usize {
+        match self.op {
+            Operation::Square => x * x,
+            Operation::Add(c) => x + c,
+            Operation::Mult(c) => x * c,
+        }
+    }
+    fn throw_to(&self, x: usize) -> usize {
+        if (x % self.test) == 0 {
+            self.next_monkey.0
+        } else {
+            self.next_monkey.1
+        }
+    }
+}
+
+#[derive(Debug)]
+enum Operation {
+    Square,
+    Add(usize),
+    Mult(usize),
+}
+
+impl Operation {
+    fn parse(i: &str) -> IResult<&str, Operation> {
+        let (i, _) = tag("old ")(i)?;
+        let (i, op) = alt((tag("* "), tag("+ ")))(i)?;
+        if let Ok((i, _)) = tag::<&str, &str, (&str, nom::error::ErrorKind)>("old")(i) {
+            Ok((i, Operation::Square))
+        } else {
+            let (i, x) = u32(i)?;
+            Ok((
+                i,
+                match op {
+                    "* " => Operation::Mult(x as usize),
+                    "+ " => Operation::Add(x as usize),
+                    _ => unreachable!(),
+                },
+            ))
+        }
+    }
+}
diff --git a/2022/src/day12.rs b/2022/src/day12.rs
new file mode 100644
index 0000000..c446c74
--- /dev/null
+++ b/2022/src/day12.rs
@@ -0,0 +1,141 @@
+mod utils;
+use std::collections::BinaryHeap;
+
+use utils::read_input;
+
+fn main() {
+    let input = read_input();
+
+    let width = input.lines().next().unwrap().len();
+    let height = input.lines().count();
+    let mut heights = vec![0; width * height];
+
+    let mut start = (0, 0);
+    let mut end = (0, 0);
+
+    for (y, line) in input.lines().enumerate() {
+        for (x, c) in line.chars().enumerate() {
+            let val = if c == 'S' {
+                start = (x as isize, y as isize);
+                0
+            } else if c == 'E' {
+                end = (x as isize, y as isize);
+                25
+            } else {
+                c.to_ascii_lowercase() as isize - 97
+            };
+            heights[(y * width) + x] = val;
+        }
+    }
+
+    let cost = pathfind(&heights, width, end);
+
+    println!("Part 1: {:?}", cost[pos_to_index(&start, width)]);
+    println!(
+        "Part 2: {:?}",
+        (0..height as isize)
+            .map(|y| (0..width as isize)
+                .map(|x| pos_to_index(&(x, y), width))
+                .filter(|idx| heights[*idx] == 0)
+                .map(|idx| cost[idx])
+                .min()
+                .unwrap())
+            .min()
+            .unwrap()
+    )
+}
+
+type HeightMap = Vec<isize>;
+type Pos = (isize, isize);
+
+fn pathfind(heights: &HeightMap, width: usize, end: Pos) -> Vec<usize> {
+    let mut min_cost = vec![usize::MAX; heights.len()];
+    let mut frontier: BinaryHeap<GraphPos> = BinaryHeap::new();
+    frontier.push(GraphPos { pos: end, moves: 0 });
+    while let Some(curr) = frontier.pop() {
+        let idx = pos_to_index(&curr.pos, width);
+        if curr.moves >= min_cost[idx] {
+            continue;
+        } else {
+            min_cost[idx] = curr.moves;
+        }
+
+        for neighbour in CanReach::new(heights, width, curr.pos) {
+            frontier.push(GraphPos {
+                pos: neighbour,
+                moves: curr.moves + 1,
+            })
+        }
+    }
+
+    min_cost
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+struct GraphPos {
+    pos: Pos,
+    moves: usize,
+}
+
+impl PartialOrd for GraphPos {
+    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+        self.moves.partial_cmp(&other.moves).map(|x| x.reverse())
+    }
+}
+
+impl Ord for GraphPos {
+    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+        self.moves.cmp(&other.moves).reverse()
+    }
+}
+
+struct CanReach<'a> {
+    heights: &'a HeightMap,
+    curr: Pos,
+    step: usize,
+    width: usize,
+}
+
+impl<'a> CanReach<'a> {
+    fn new(heights: &'a HeightMap, width: usize, pos: Pos) -> Self {
+        CanReach {
+            heights,
+            curr: pos,
+            step: 0,
+            width,
+        }
+    }
+}
+impl Iterator for CanReach<'_> {
+    type Item = Pos;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let (curr_x, curr_y) = self.curr;
+        loop {
+            let (x, y) = match self.step {
+                0 => (curr_x + 1, curr_y),
+                1 => (curr_x - 1, curr_y),
+                2 => (curr_x, curr_y + 1),
+                3 => (curr_x, curr_y - 1),
+                _ => break,
+            };
+            self.step += 1;
+
+            if (x >= 0
+                && x < self.width as isize
+                && y >= 0
+                && y < (self.heights.len() / self.width) as isize)
+                && self.heights[pos_to_index(&(x, y), self.width)]
+                    >= self.heights[pos_to_index(&(curr_x, curr_y), self.width)] - 1
+            {
+                return Some((x, y));
+            }
+        }
+        None
+    }
+}
+
+#[inline(always)]
+fn pos_to_index(pos: &Pos, width: usize) -> usize {
+    ((pos.1 * width as isize) + pos.0) as usize
+}
diff --git a/2022/src/day13.rs b/2022/src/day13.rs
new file mode 100644
index 0000000..17b55eb
--- /dev/null
+++ b/2022/src/day13.rs
@@ -0,0 +1,132 @@
+mod utils;
+use std::{
+    cmp::Ordering,
+    iter::{once, Peekable},
+};
+
+extern crate nom;
+use nom::{bytes::complete::tag, character::complete::u32};
+use utils::read_input;
+
+fn main() {
+    let input = read_input();
+
+    let mut full: Vec<_> = input.lines().filter(|x| !x.is_empty()).collect();
+
+    println!(
+        "Part 1: {}",
+        full.iter()
+            .step_by(2)
+            .zip(full.iter().skip(1).step_by(2))
+            .map(|(left, right)| { compare(left, right) })
+            .enumerate()
+            .filter_map(|(i, cmp)| match cmp {
+                Ordering::Greater => None,
+                _ => Some(i + 1),
+            })
+            .sum::<usize>()
+    );
+
+    full.sort_by(|l, r| compare(l, r));
+
+    println!(
+        "Part 2: {}",
+        full.iter()
+            .enumerate()
+            .filter_map(|(i, val)| match *val {
+                "[[2]]" | "[[6]]" => Some(i + 1),
+                _ => None,
+            })
+            .product::<usize>()
+    );
+}
+
+fn compare(left: &str, right: &str) -> Ordering {
+    let mut left = Packet(left).peekable();
+    let mut right = Packet(right).peekable();
+    assert_eq!(left.next(), Some(PacketContents::StartList));
+    assert_eq!(right.next(), Some(PacketContents::StartList));
+    compare_lists(&mut left, &mut right)
+}
+
+fn compare_lists(
+    left: &mut Peekable<impl Iterator<Item = PacketContents>>,
+    right: &mut Peekable<impl Iterator<Item = PacketContents>>,
+) -> Ordering {
+    loop {
+        match (left.next().unwrap(), right.next().unwrap()) {
+            (PacketContents::EndList, PacketContents::EndList) => {
+                return Ordering::Equal;
+            }
+            (PacketContents::EndList, _) => {
+                while !matches!(right.next(), Some(PacketContents::EndList)) {}
+                return Ordering::Less;
+            }
+            (_, PacketContents::EndList) => {
+                while !matches!(left.next(), Some(PacketContents::EndList)) {}
+
+                return Ordering::Greater;
+            }
+            (PacketContents::StartList, PacketContents::StartList) => {
+                match compare_lists(left, right) {
+                    Ordering::Equal => (),
+                    x => return x,
+                }
+            }
+            (l @ PacketContents::Integer(_), PacketContents::StartList) => {
+                match compare_lists(
+                    &mut once(l).chain(once(PacketContents::EndList)).peekable(),
+                    right,
+                ) {
+                    Ordering::Equal => (),
+                    x => return x,
+                }
+            }
+            (PacketContents::StartList, r @ PacketContents::Integer(_)) => {
+                match compare_lists(
+                    left,
+                    &mut once(r).chain(once(PacketContents::EndList)).peekable(),
+                ) {
+                    Ordering::Equal => (),
+                    x => return x,
+                }
+            }
+            (PacketContents::Integer(l), PacketContents::Integer(r)) => match l.cmp(&r) {
+                Ordering::Equal => (),
+                x => return x,
+            },
+        };
+    }
+}
+
+#[derive(Debug, PartialEq, Eq)]
+enum PacketContents {
+    Integer(usize),
+    StartList,
+    EndList,
+}
+
+struct Packet<'a>(&'a str);
+
+impl Iterator for Packet<'_> {
+    type Item = PacketContents;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        loop {
+            if let Ok((i, _)) = tag::<_, _, (&str, nom::error::ErrorKind)>("[")(self.0) {
+                self.0 = i;
+                return Some(PacketContents::StartList);
+            } else if let Ok((i, _)) = tag::<_, _, (&str, nom::error::ErrorKind)>("]")(self.0) {
+                self.0 = i;
+                return Some(PacketContents::EndList);
+            } else if let Ok((i, x)) = u32::<_, (&str, nom::error::ErrorKind)>(self.0) {
+                self.0 = i;
+                return Some(PacketContents::Integer(x as usize));
+            } else if let Ok((i, _)) = tag::<_, _, (&str, nom::error::ErrorKind)>(",")(self.0) {
+                self.0 = i;
+            } else {
+                return None;
+            }
+        }
+    }
+}
diff --git a/2022/src/day14.html b/2022/src/day14.html
new file mode 100644
index 0000000..c441303
--- /dev/null
+++ b/2022/src/day14.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+	<link data-trunk rel="rust" data-wasm-opt="2" href="../Cargo.toml" data-bin="day14" />
+
+	<style>
+		html {
+			/* Remove touch delay: */
+			touch-action: manipulation;
+		}
+
+		html,
+		body {
+			overflow: hidden;
+			margin: 0 !important;
+			padding: 0 !important;
+			height: 100%;
+			width: 100%;
+		}
+
+		canvas {
+			margin-right: auto;
+			margin-left: auto;
+			display: block;
+			position: absolute;
+			top: 0%;
+			left: 50%;
+			transform: translate(-50%, 0%);
+		}
+	</style>
+</head>
+
+<body>
+	<canvas id="canvas"></canvas>
+</body>
+
+</html>
diff --git a/2022/src/day14.rs b/2022/src/day14.rs
new file mode 100644
index 0000000..903f919
--- /dev/null
+++ b/2022/src/day14.rs
@@ -0,0 +1,230 @@
+mod utils;
+use std::{
+    cmp::{max, min},
+    collections::HashSet,
+    ops::Add,
+    time::Duration,
+};
+
+use egui::{Color32, Rect, Sense, Stroke};
+use nom::{bytes::complete::tag, character::complete::u32, multi::separated_list0, IResult};
+
+fn main() {
+    console_error_panic_hook::set_once();
+
+    let input = include_str!("../fake_inputs/day14");
+
+    let options = eframe::WebOptions::default();
+    wasm_bindgen_futures::spawn_local(async {
+        eframe::start_web("canvas", options, Box::new(|_cc| Box::new(App::new(input))))
+            .await
+            .expect("unable to start eframe");
+    });
+}
+
+struct App {
+    structures: Vec<Structure>,
+    sand_grains: HashSet<Pos>,
+    speed: usize,
+    finished: bool,
+}
+
+impl App {
+    fn new(input: &str) -> Self {
+        let mut structures = separated_list0(tag("\n"), Structure::parse)(input)
+            .unwrap()
+            .1;
+        let floor_y = structures
+            .iter()
+            .map(|s| s.points.iter().map(|p| p.1).max().unwrap())
+            .max()
+            .unwrap()
+            + 2;
+        structures.push(Structure::new(vec![
+            Pos(isize::MIN, floor_y),
+            Pos(isize::MAX, floor_y),
+        ]));
+
+        App {
+            structures,
+            sand_grains: HashSet::new(),
+            speed: 0,
+            finished: false,
+        }
+    }
+
+    fn reset(&mut self) {
+        self.sand_grains.clear();
+    }
+
+    fn step(&mut self) {
+        let mut pos = Pos(500, 0);
+        if self.sand_grains.contains(&pos) {
+            self.finished = true;
+            return;
+        }
+        loop {
+            // TODO
+            pos = if !self.inhabited(pos + Pos(0, 1)) {
+                pos + Pos(0, 1)
+            } else if !self.inhabited(pos + Pos(-1, 1)) {
+                pos + Pos(-1, 1)
+            } else if !self.inhabited(pos + Pos(1, 1)) {
+                pos + Pos(1, 1)
+            } else {
+                self.sand_grains.insert(pos);
+                return;
+            };
+        }
+    }
+
+    fn inhabited(&self, pos: Pos) -> bool {
+        self.structures.iter().any(|s| s.contains(pos)) || self.sand_grains.contains(&pos)
+    }
+}
+
+#[derive(Debug)]
+struct Structure {
+    points: Vec<Pos>,
+    bbox_min: Pos,
+    bbox_max: Pos,
+}
+
+impl Structure {
+    fn new(points: Vec<Pos>) -> Self {
+        let bbox_min = points.iter().fold(Pos(isize::MAX, isize::MAX), |acc, pos| {
+            Pos(min(acc.0, pos.0), min(acc.1, pos.1))
+        });
+        let bbox_max = points.iter().fold(Pos(isize::MAX, isize::MAX), |acc, pos| {
+            Pos(max(acc.0, pos.0), max(acc.1, pos.1))
+        });
+
+        Structure {
+            points,
+            bbox_max,
+            bbox_min,
+        }
+    }
+    fn parse(i: &str) -> IResult<&str, Self> {
+        let (i, points) = separated_list0(tag(" -> "), Pos::parse)(i)?;
+
+        Ok((i, Structure::new(points)))
+    }
+
+    fn contains(&self, pos: Pos) -> bool {
+        if pos.0 < self.bbox_min.0
+            || pos.0 > self.bbox_max.0
+            || pos.1 < self.bbox_min.1
+            || pos.1 > self.bbox_max.1
+        {
+            return false;
+        }
+        for (a, b) in self.points.iter().zip(self.points.iter().skip(1)) {
+            if a.0 == b.0 {
+                if pos.0 == a.0 && pos.1 >= min(a.1, b.1) && pos.1 <= max(a.1, b.1) {
+                    return true;
+                }
+            } else {
+                // a.1 == b.1
+                if pos.1 == a.1 && pos.0 >= min(a.0, b.0) && pos.0 <= max(a.0, b.0) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+struct Pos(isize, isize);
+impl Pos {
+    fn parse(i: &str) -> IResult<&str, Self> {
+        let (i, x) = u32(i)?;
+        let (i, _) = tag(",")(i)?;
+        let (i, y) = u32(i)?;
+
+        Ok((i, Pos(x as _, y as _)))
+    }
+}
+impl From<Pos> for egui::Pos2 {
+    fn from(value: Pos) -> Self {
+        egui::Pos2 {
+            x: value.0 as _,
+            y: value.1 as _,
+        }
+    }
+}
+
+impl Add for Pos {
+    type Output = Pos;
+
+    fn add(self, rhs: Self) -> Self::Output {
+        Pos(self.0 + rhs.0, self.1 + rhs.1)
+    }
+}
+
+impl eframe::App for App {
+    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        egui::SidePanel::right("instructions").show(ctx, |ui| {
+            egui::ScrollArea::vertical().show(ui, |ui| {
+                if ui.button("Step").clicked() && !self.finished {
+                    self.step();
+                }
+                if ui.button("Reset").clicked() {
+                    self.reset()
+                }
+                ui.label(format!(
+                    "{} grains, finished: {}",
+                    self.sand_grains.len(),
+                    self.finished
+                ));
+                ui.add(egui::Slider::new(&mut self.speed, 0..=100).text("Speed"));
+            })
+        });
+
+        if self.speed > 0 {
+            for _ in 0..self.speed {
+                self.step();
+            }
+            ctx.request_repaint_after(Duration::from_millis(100))
+        }
+
+        egui::CentralPanel::default().show(ctx, |ui| {
+            let mut painter_size = ui.available_size_before_wrap();
+            if !painter_size.is_finite() {
+                painter_size = egui::vec2(500.0, 500.0);
+            }
+
+            const RANGE: f32 = 200.0;
+            const SHIFT: egui::Pos2 = egui::pos2(400.0, 5.0);
+            let (_, painter) = ui.allocate_painter(painter_size, Sense::hover());
+
+            let transform_point = |p: &Pos| -> egui::Pos2 {
+                egui::pos2(
+                    ((p.0 as f32 - SHIFT.x) / RANGE) * painter_size.x,
+                    ((p.1 as f32 + SHIFT.y) / RANGE) * painter_size.y,
+                )
+            };
+            for structure in self.structures.iter() {
+                for (a, b) in structure.points.iter().zip(structure.points.iter().skip(1)) {
+                    painter.line_segment(
+                        [transform_point(a), transform_point(b)],
+                        Stroke::new(1.0, Color32::RED),
+                    );
+                }
+            }
+
+            for grain in self.sand_grains.iter() {
+                painter.rect(
+                    Rect {
+                        min: transform_point(grain),
+                        max: transform_point(&Pos(grain.0 + 1, grain.1 + 1)),
+                    },
+                    egui::Rounding::none(),
+                    Color32::YELLOW,
+                    Stroke::NONE,
+                )
+            }
+        });
+    }
+}
diff --git a/2022/src/utils.rs b/2022/src/utils.rs
new file mode 100644
index 0000000..8230c69
--- /dev/null
+++ b/2022/src/utils.rs
@@ -0,0 +1,59 @@
+#![allow(unused)]
+use std::{fs::File, io::Read, str::FromStr};
+
+pub fn read_input() -> String {
+    let mut args = std::env::args();
+
+    let mut file = File::open(
+        args.nth(1)
+            .expect("first argument should be input filename"),
+    )
+    .expect("could not open input");
+    let mut out = String::new();
+    file.read_to_string(&mut out)
+        .expect("could not read input file");
+
+    out
+}
+
+pub fn max_n<T: Ord>(vec: &mut Vec<T>, n: usize) -> &[T] {
+    top_n_by(vec, |a, b| a > b, n)
+}
+
+pub fn top_n_by<T, F: FnMut(&T, &T) -> bool>(vec: &mut Vec<T>, mut f: F, n: usize) -> &[T] {
+    for _ in 0..n {
+        for i in 0..vec.len() - 1 {
+            if f(&vec[i], &vec[i + 1]) {
+                vec.swap(i, i + 1);
+            }
+        }
+    }
+
+    &vec[vec.len() - n..]
+}
+
+pub fn iter_pair<T>(mut i: impl Iterator<Item = T>) -> (T, T) {
+    (i.next().unwrap(), i.next().unwrap())
+}
+
+pub fn iter_triple<T>(mut i: impl Iterator<Item = T>) -> (T, T, T) {
+    (i.next().unwrap(), i.next().unwrap(), i.next().unwrap())
+}
+
+#[inline(always)]
+pub fn parse_num<T: FromStr>(string: &str) -> (T, &str)
+where
+    <T as FromStr>::Err: std::fmt::Debug,
+{
+    let count = string
+        .chars()
+        .take_while(|x| x.is_numeric() || *x == '-')
+        .count();
+
+    (string[..count].parse().unwrap(), &string[count..])
+}
+
+#[inline(always)]
+pub fn parse_static<'a>(exp: &'static str, source: &'a str) -> &'a str {
+    &source[exp.len()..]
+}