perf: Merge Advent of Code year specific repos

38 files changed, 3311 insertions, 0 deletions

diff --git a/2024/OCaml/.editorconfig b/2024/OCaml/.editorconfig
new file mode 100644
index 0000000..24b0621
--- /dev/null
+++ b/2024/OCaml/.editorconfig
@@ -0,0 +1,21 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.ml]
+indent_style = space
+indent_size = 2
+
+[*.php]
+indent_style = space
+indent_size = 4
+
+[*.go]
+indent_style = tab
+
+[Makefile]
+indent_style = tab
diff --git a/2024/OCaml/.env.template b/2024/OCaml/.env.template
new file mode 100644
index 0000000..637094f
--- /dev/null
+++ b/2024/OCaml/.env.template
@@ -0,0 +1 @@
+SESSION=REPLACE_ME
diff --git a/2024/OCaml/.envrc b/2024/OCaml/.envrc
new file mode 100644
index 0000000..1d953f4
--- /dev/null
+++ b/2024/OCaml/.envrc
@@ -0,0 +1 @@
+use nix
diff --git a/2024/OCaml/.gitignore b/2024/OCaml/.gitignore
new file mode 100644
index 0000000..a251688
--- /dev/null
+++ b/2024/OCaml/.gitignore
@@ -0,0 +1,32 @@
+*.annot
+*.cmo
+*.cma
+*.cmi
+*.a
+*.o
+*.cmx
+*.cmxs
+*.cmxa
+
+# ocamlbuild working directory
+_build/
+
+# ocamlbuild targets
+*.byte
+*.native
+
+# oasis generated files
+setup.data
+setup.log
+
+# Merlin configuring file for Vim and Emacs
+.merlin
+
+# Dune generated files
+*.install
+
+# Local OPAM switch
+_opam/
+
+.env
+.direnv
diff --git a/2024/OCaml/.ocamlformat b/2024/OCaml/.ocamlformat
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/2024/OCaml/.ocamlformat
diff --git a/2024/OCaml/AoC_2024.opam b/2024/OCaml/AoC_2024.opam
new file mode 100644
index 0000000..41c0f97
--- /dev/null
+++ b/2024/OCaml/AoC_2024.opam
@@ -0,0 +1,31 @@
+# This file is generated by dune, edit dune-project instead
+opam-version: "2.0"
+synopsis: "Advent of Code 2024"
+description: "Solutions to the Advent of Code puzzles for 2024"
+maintainer: ["D.J. O'Leary"]
+authors: ["D.J. O'Leary"]
+license: "MIT"
+tags: ["aoc2024" "Advent of Code 2024"]
+homepage: "https://github.com/DJOLEARY/AoC_2024"
+doc: "https://github.com/DJOLEARY/AoC_2024/blob/main/README.md"
+bug-reports: "https://github.com/DJOLEARY/AoC_2024/issues"
+depends: [
+  "ocaml"
+  "dune" {>= "3.16"}
+  "odoc" {with-doc}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+]
+dev-repo: "git+https://github.com/DJOLEARY/AoC_2024.git"
diff --git a/2024/OCaml/LICENSE b/2024/OCaml/LICENSE
new file mode 100644
index 0000000..714c645
--- /dev/null
+++ b/2024/OCaml/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 D.J. O'Leary
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/2024/OCaml/README.md b/2024/OCaml/README.md
new file mode 100644
index 0000000..96db988
--- /dev/null
+++ b/2024/OCaml/README.md
@@ -0,0 +1,22 @@
+# Advent of Code 2024
+
+## Getting Started
+
+### How to Build
+
+```sh
+dune build
+```
+
+### How to Run
+
+```sh
+dune exec AoC_2024
+```
+
+### How to Test
+
+```sh
+dune runtest
+```
+
diff --git a/2024/OCaml/Taskfile.yml b/2024/OCaml/Taskfile.yml
new file mode 100644
index 0000000..067ecec
--- /dev/null
+++ b/2024/OCaml/Taskfile.yml
@@ -0,0 +1,100 @@
+# https://taskfile.dev
+
+version: '3'
+
+vars:
+  PROJECT_NAME: AoC_2024
+  YEAR: 2024
+  ASSET_DIR: input
+  SRC_DIR: lib
+  SRC_TEMPLATE: part.ml
+  TEST_DIR: test
+  TEST_TEMPLATE: test.ml
+
+dotenv: ['.env']
+
+tasks:
+  default:
+    desc: "Prints this message"
+    cmds:
+      - cmd: task --list-all
+
+  day:setup:
+    desc: "Creates the files needed to solve a day of Advent of Code"
+    requires:
+      vars:
+        - DAY
+    vars:
+      FORMATTED_DAY: "{{if (lt (atoi .DAY) 10)}}0{{.DAY}}{{else}}{{.DAY}}{{end}}"
+    cmds:
+      - cmd: mkdir --parents {{ .SRC_DIR }}/day_{{ .FORMATTED_DAY }}
+      - cmd: cp templates/{{.SRC_TEMPLATE}} {{.SRC_DIR}}/day_{{.FORMATTED_DAY}}/part_01.ml
+      - cmd: mkdir --parents {{ .TEST_DIR }}
+      - cmd: cp templates/{{.TEST_TEMPLATE}} {{.TEST_DIR}}/day_{{.FORMATTED_DAY}}_part_01.ml
+      - task: fetch-input
+      - task: build
+    silent: true
+
+  fetch-input:
+    desc: "Fetches your input from adventofcode.com for the specified day"
+    internal: true
+    requires:
+      vars:
+        - DAY
+    vars:
+      URI: https://adventofcode.com/{{ .YEAR }}/day/{{.DAY}}/input
+      FORMATTED_DAY: "{{if (lt (atoi .DAY) 10)}}0{{.DAY}}{{else}}{{.DAY}}{{end}}"
+    cmds:
+      - cmd: curl --cookie 'session={{.SESSION}}' {{.URI}} > {{.ASSET_DIR}}/day_{{.FORMATTED_DAY}}.txt
+    silent: true
+
+  build:doc:
+    desc: "Builds documentation using ocamldoc"
+    preconditions:
+      - which ocamldoc
+    cmds:
+      - cmd: ocamldoc -html -d docs bin/main.ml
+    silent: true
+
+  build:
+    desc: "Builds the project"
+    preconditions:
+      - which dune
+    cmds:
+      - cmd: dune build
+
+  test:
+    desc: "Runs the tests in the 'tests' directory"
+    ignore_error: true
+    env:
+      OUNIT_CI: true
+    preconditions:
+      - which dune
+    deps:
+      - task: build
+    cmds:
+      - cmd: dune test {{.CLI_ARGS}}
+
+  test:watch:
+    desc: "Continuously runs the tests in the 'tests' directory"
+    ignore_error: true
+    sources:
+      - "lib/**/*.ml"
+      - "test/**/*.ml"
+    env:
+      OUNIT_CI: true
+    preconditions:
+      - which dune
+    deps:
+      - task: build
+    cmds:
+      - cmd: dune test --watch {{.CLI_ARGS}}
+
+  run:
+    desc: "Runs the project"
+    preconditions:
+      - which dune
+    deps:
+      - task: build
+    cmds:
+      - cmd: dune exec {{.PROJECT_NAME}}
diff --git a/2024/OCaml/bin/dune b/2024/OCaml/bin/dune
new file mode 100644
index 0000000..ee36b46
--- /dev/null
+++ b/2024/OCaml/bin/dune
@@ -0,0 +1,5 @@
+(executable
+ (public_name AoC_2024)
+ (name main)
+ (modes byte exe)
+ (libraries AoC_2024))
diff --git a/2024/OCaml/bin/main.ml b/2024/OCaml/bin/main.ml
new file mode 100644
index 0000000..a76e046
--- /dev/null
+++ b/2024/OCaml/bin/main.ml
@@ -0,0 +1,46 @@
+open AoC_2024
+
+let day_to_path day =
+  let string_day = string_of_int day in
+  let formatted_day = if day < 10 then "0" ^ string_day else string_day in
+  "../_input/day_" ^ formatted_day ^ ".txt"
+
+let print_solution day_num part_num answer =
+  print_string "D";
+  print_int day_num;
+  print_string ":P";
+  print_int part_num;
+  print_string " -> ";
+  print_int answer;
+  print_newline ()
+
+let day_1 =
+  let lines = File.Read_input.lines_from_file (day_to_path 1) in
+  let left, right = Day_01.Part_01.lines_to_lists lines in
+  let part_01 = Day_01.Part_01.solve left right in
+  print_solution 1 1 part_01;
+  let part_02 = Day_01.Part_02.solve left right in
+  print_solution 1 2 part_02
+
+let day_2 =
+  let lines = File.Read_input.lines_from_file (day_to_path 2) in
+  let reports = Day_02.Part_01.lines_to_reports lines in
+  let part_01 = Day_02.Part_01.solve reports in
+  print_solution 2 1 part_01
+
+let day_3 =
+  let lines = File.Read_input.lines_from_file (day_to_path 3) in
+  let line = List.fold_left (fun acc line -> acc ^ line) "" lines in
+  let part_01 = Day_03.Part_01.solve line in
+  print_solution 3 1 part_01
+
+let day_4 =
+  let lines = File.Read_input.lines_from_file (day_to_path 4) in
+  let part_01 = Day_04.Part_01.solve lines in
+  print_solution 4 1 part_01
+
+let _ =
+  day_1;
+  day_2;
+  day_3;
+  day_4
diff --git a/2024/OCaml/dune-project b/2024/OCaml/dune-project
new file mode 100644
index 0000000..ee86a69
--- /dev/null
+++ b/2024/OCaml/dune-project
@@ -0,0 +1,28 @@
+(lang dune 3.16)
+
+(name AoC_2024)
+
+(generate_opam_files true)
+
+(source
+ (github DJOLEARY/AoC_2024))
+
+(authors "D.J. O'Leary")
+
+(maintainers "D.J. O'Leary")
+
+(license MIT)
+
+(documentation https://github.com/DJOLEARY/AoC_2024/blob/main/README.md)
+
+(map_workspace_root false)
+
+(package
+ (name AoC_2024)
+ (synopsis "Advent of Code 2024")
+ (description "Solutions to the Advent of Code puzzles for 2024")
+ (depends ocaml dune)
+ (tags
+  (aoc2024 "Advent of Code 2024")))
+
+; See the complete stanza docs at https://dune.readthedocs.io/en/stable/reference/dune-project/index.html
diff --git a/2024/OCaml/lib/day_01/part_01.ml b/2024/OCaml/lib/day_01/part_01.ml
new file mode 100644
index 0000000..100b12a
--- /dev/null
+++ b/2024/OCaml/lib/day_01/part_01.ml
@@ -0,0 +1,40 @@
+(* Day 1: Part 1 *)
+
+let calculate_distance x y = Stdlib.abs (x - y)
+
+(** Require: left and right to be the same length *)
+let solve left right =
+  let sorted_left = List.sort Stdlib.compare left in
+  let sorted_right = List.sort Stdlib.compare right in
+  let distances = List.map2 calculate_distance sorted_left sorted_right in
+  List.fold_left ( + ) 0 distances
+
+let left line =
+  let pos = 0 in
+  let len = String.index line ' ' in
+  String.sub line pos len
+
+let right line =
+  let pos = String.rindex line ' ' + 1 in
+  let len = String.length line - pos in
+  String.sub line pos len
+
+let line_to_tuple line = (left line, right line)
+
+let lines_to_lists lines =
+  let tuples = List.map line_to_tuple lines in
+  let left =
+    List.map
+      (fun t ->
+        let l, _ = t in
+        int_of_string l)
+      tuples
+  in
+  let right =
+    List.map
+      (fun t ->
+        let _, r = t in
+        int_of_string r)
+      tuples
+  in
+  (left, right)
diff --git a/2024/OCaml/lib/day_01/part_02.ml b/2024/OCaml/lib/day_01/part_02.ml
new file mode 100644
index 0000000..532b344
--- /dev/null
+++ b/2024/OCaml/lib/day_01/part_02.ml
@@ -0,0 +1,43 @@
+(* Day 1: Part 2 *)
+
+let rec count_occurrances_help element acc lst =
+  match lst with
+  | [] -> acc
+  | h :: t ->
+      if h = element then count_occurrances_help element (acc + 1) t
+      else count_occurrances_help element acc t
+
+let count_occurrances element lst = count_occurrances_help element 0 lst
+
+let solve left right =
+  List.map (fun x -> x * count_occurrances x right) left |> List.fold_left ( + ) 0
+
+let left line =
+  let pos = 0 in
+  let len = String.index line ' ' in
+  String.sub line pos len
+
+let right line =
+  let pos = String.rindex line ' ' + 1 in
+  let len = String.length line - pos in
+  String.sub line pos len
+
+let line_to_tuple line = (left line, right line)
+
+let lines_to_lists lines =
+  let tuples = List.map line_to_tuple lines in
+  let left =
+    List.map
+      (fun t ->
+        let l, _ = t in
+        int_of_string l)
+      tuples
+  in
+  let right =
+    List.map
+      (fun t ->
+        let _, r = t in
+        int_of_string r)
+      tuples
+  in
+  (left, right)
diff --git a/2024/OCaml/lib/day_02/part_01.ml b/2024/OCaml/lib/day_02/part_01.ml
new file mode 100644
index 0000000..32d7ab8
--- /dev/null
+++ b/2024/OCaml/lib/day_02/part_01.ml
@@ -0,0 +1,42 @@
+(* Day 2: Part 1 *)
+
+type level = int
+type reports = level list list
+
+let rec compare_report_levels_helper comparison prev report =
+  match report with
+  | [] -> true
+  | h :: t -> comparison prev h && compare_report_levels_helper comparison h t
+
+let compare_report_levels comparison report =
+  match report with
+  | [] -> true
+  | h :: t -> compare_report_levels_helper comparison h t
+
+let all_increasing report = compare_report_levels ( < ) report
+let all_decreasing report = compare_report_levels ( > ) report
+
+let at_least_one report =
+  compare_report_levels (fun prev curr -> prev <> curr) report
+
+let at_most_three report =
+  compare_report_levels (fun prev curr -> abs (prev - curr) <= 3) report
+
+let check_report_safety report =
+  if not (all_increasing report || all_decreasing report) then false
+  else if not (at_least_one report && at_most_three report) then false
+  else true
+
+let rec count_safe_reports acc lst =
+  match lst with
+  | [] -> acc
+  | h :: t ->
+      if h then count_safe_reports (acc + 1) t else count_safe_reports acc t
+
+let solve reports =
+  reports |> List.map check_report_safety |> count_safe_reports 0
+
+let line_to_report line =
+  line |> String.split_on_char ' ' |> List.map int_of_string
+
+let lines_to_reports lines = List.map line_to_report lines
diff --git a/2024/OCaml/lib/day_03/part_01.ml b/2024/OCaml/lib/day_03/part_01.ml
new file mode 100644
index 0000000..c12b68a
--- /dev/null
+++ b/2024/OCaml/lib/day_03/part_01.ml
@@ -0,0 +1,33 @@
+(* Day 3: Part 1 *)
+
+let find_mul text =
+  let regex_or_err = Re2.create "mul\\(([0-9]{1,3}),([0-9]{1,3})\\)" in
+  match regex_or_err with
+  | Ok regex -> (
+      let matches = Re2.get_matches regex text in
+      match matches with Ok matches -> matches | Error _ -> [])
+  | Error _ -> []
+
+let extract_pairs (matches : Re2.Match.t list) : (int * int) list =
+  List.map
+    (fun x ->
+      let left = Re2.Match.get x ~sub:(`Index 1) in
+      match left with
+      | None -> (0, 0)
+      | Some left -> (
+          let left_num = int_of_string left in
+          let right = Re2.Match.get x ~sub:(`Index 2) in
+          match right with
+          | None -> (0, 0)
+          | Some right ->
+              let right_num = int_of_string right in
+              (left_num, right_num)))
+    matches
+
+let solve input =
+  input |> find_mul |> extract_pairs
+  |> List.fold_left
+       (fun acc pair ->
+         let left, right = pair in
+         acc + (left * right))
+       0
diff --git a/2024/OCaml/lib/day_04/part_01.ml b/2024/OCaml/lib/day_04/part_01.ml
new file mode 100644
index 0000000..63c1cfd
--- /dev/null
+++ b/2024/OCaml/lib/day_04/part_01.ml
@@ -0,0 +1,84 @@
+(* Day 4: Part 1 *)
+
+type character = { index : int; character : char }
+type direction = N | NE | E | SE | S | SW | W | NW
+
+let all_directions = [ N; NE; E; SE; S; SW; W; NW ]
+let needle = "XMAS"
+
+(** [calculate_row_offset lines] is the offset used to move between the rows of the concatenated variant of [lines] as though it were a grid.
+    Requires: values of [lines] all have the same length *)
+let calculate_row_offset lines =
+  match lines with [] -> 0 | h :: _ -> String.length h
+
+let join_lines lines =
+  let concat_trim acc line = acc ^ String.trim line in
+  List.fold_left concat_trim "" lines
+
+let explode s = List.init (String.length s) (String.get s)
+let is_in_bounds length index = index >= 0 && index < length
+
+let get_at_index line index =
+  let length = String.length line in
+  if not (is_in_bounds length index) then "."
+  else
+    let character = String.get line index in
+    Char.escaped character
+
+let get_direction_index row_offset direction index =
+  match direction with
+  | N -> index - row_offset
+  | NE -> index - row_offset + 1
+  | E -> index + 1
+  | SE -> index + row_offset + 1
+  | S -> index + row_offset
+  | SW -> index + row_offset - 1
+  | W -> index - 1
+  | NW -> index - row_offset - 1
+
+let get_direction_string get_char get_offset_index index =
+  let first = get_char index in
+  let second_index = get_offset_index index in
+  let second = get_char second_index in
+  let third_index = get_offset_index second_index in
+  let third = get_char third_index in
+  let fourth_index = get_offset_index third_index in
+  let fourth = get_char fourth_index in
+  first ^ second ^ third ^ fourth
+
+let check_direction get_from_line get_offset_index index direction =
+  get_direction_string get_from_line (get_offset_index direction) index = needle
+
+let calculate_num_of_matches line row_offset character =
+  let get_from_line_at_index = get_at_index line in
+  let get_offset_direction_index = get_direction_index row_offset in
+  let check_direction_from_index =
+    check_direction get_from_line_at_index get_offset_direction_index
+      character.index
+  in
+  all_directions
+  |> List.map check_direction_from_index
+  |> List.map (fun x -> match x with true -> 1 | false -> 0)
+  |> List.fold_left ( + ) 0
+
+(* Tried:
+   2544 -> too high
+   1272 (previous halved) -> too low *)
+let solve lines =
+  let row_offset = calculate_row_offset lines in
+  let line = join_lines lines in
+  let chars = explode line in
+  let characters = List.mapi (fun i c -> { index = i; character = c }) chars in
+  let xs =
+    List.filter
+      (fun c -> match c.character with 'X' -> true | _ -> false)
+      characters
+  in
+  let calculate_num_of_surrounding_matches_in_line =
+    calculate_num_of_matches line row_offset
+  in
+  let num_of_matches =
+    List.map calculate_num_of_surrounding_matches_in_line xs
+    |> List.fold_left ( + ) 0
+  in
+  num_of_matches
diff --git a/2024/OCaml/lib/day_04/php/Grid.php b/2024/OCaml/lib/day_04/php/Grid.php
new file mode 100644
index 0000000..c0382df
--- /dev/null
+++ b/2024/OCaml/lib/day_04/php/Grid.php
@@ -0,0 +1,67 @@
+<?php
+
+declare(strict_types=1);
+
+class Grid implements Stringable
+{
+	/**
+	 * @param string[][] $data
+	 */
+	public function __construct(public array $data) {}
+
+	public function __toString(): string
+	{
+		$rowToLine = fn(array $row): string => array_reduce(
+			array: $row,
+			callback: fn(string $acc, string $character): string => $acc . $character,
+			initial: "",
+		);
+
+		return array_reduce(
+			array: $this->data,
+			callback: fn(string $acc, array $row): string => $acc . $rowToLine($row) . PHP_EOL,
+			initial: "",
+		);
+	}
+
+	public function getCharacterAtPosition(Position $position): string
+	{
+		if ($this->isInBounds($position)) {
+			return $this->data[$position->y][$position->x];
+		}
+
+		return ".";
+	}
+
+	/**
+	 * @param Position[] $positions
+	 */
+	public function getStringFromPositions(array $positions): string
+	{
+		$characters = array_map(
+			callback: fn(Position $position): string => $this->getCharacterAtPosition($position),
+			array: $positions,
+		);
+
+		$string = array_reduce(
+			array: $characters,
+			callback: fn(string $acc, string $character): string => $acc . $character,
+			initial: "",
+		);
+
+		return $string;
+	}
+
+	public function isInBounds(Position $position): bool
+	{
+		if (!array_key_exists($position->y, $this->data)) {
+			return false;
+		}
+
+		if (!array_key_exists($position->x, $this->data[$position->y])) {
+			return false;
+		}
+
+		return true;
+	}
+}
diff --git a/2024/OCaml/lib/day_04/php/Input.php b/2024/OCaml/lib/day_04/php/Input.php
new file mode 100644
index 0000000..f7e03c1
--- /dev/null
+++ b/2024/OCaml/lib/day_04/php/Input.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+class Input
+{
+	public string $contents;
+
+	public function __construct(private string $fileName)
+	{
+		$contents = file_get_contents($this->fileName, use_include_path: true);
+		$this->contents = $contents === false ? "" : $contents;
+	}
+
+	public function toGrid(): Grid
+	{
+		$lines = explode("\n", $this->contents);
+		$gridArray = array_map(
+			callback: fn(string $line): array => str_split(trim($line)),
+			array: $lines
+		);
+
+		return new Grid($gridArray);
+	}
+}
diff --git a/2024/OCaml/lib/day_04/php/Position.php b/2024/OCaml/lib/day_04/php/Position.php
new file mode 100644
index 0000000..182da7e
--- /dev/null
+++ b/2024/OCaml/lib/day_04/php/Position.php
@@ -0,0 +1,77 @@
+<?php
+
+declare(strict_types=1);
+
+class Position implements Stringable
+{
+	public function __construct(public $x, public $y) {}
+
+	public function __toString(): string
+	{
+		return "({$this->x}, {$this->y})";
+	}
+
+	/**
+	 * Not validated
+	 */
+	public function getNorth(): self
+	{
+		return new self($this->x, $this->y - 1);
+	}
+
+	/**
+	 * Not validated
+	 */
+	public function getNorthEast(): self
+	{
+		return new self($this->x + 1, $this->y - 1);
+	}
+
+	/**
+	 * Not validated
+	 */
+	public function getEast(): self
+	{
+		return new self($this->x + 1, $this->y);
+	}
+
+	/**
+	 * Not validated
+	 */
+	public function getSouthEast(): self
+	{
+		return new self($this->x + 1, $this->y + 1);
+	}
+
+	/**
+	 * Not validated
+	 */
+	public function getSouth(): self
+	{
+		return new self($this->x, $this->y + 1);
+	}
+
+	/**
+	 * Not validated
+	 */
+	public function getSouthWest(): self
+	{
+		return new self($this->x - 1, $this->y + 1);
+	}
+
+	/**
+	 * Not validated
+	 */
+	public function getWest(): self
+	{
+		return new self($this->x - 1, $this->y);
+	}
+
+	/**
+	 * Not validated
+	 */
+	public function getNorthWest(): self
+	{
+		return new self($this->x - 1, $this->y - 1);
+	}
+}
diff --git a/2024/OCaml/lib/day_04/php/part_01.php b/2024/OCaml/lib/day_04/php/part_01.php
new file mode 100644
index 0000000..250da0c
--- /dev/null
+++ b/2024/OCaml/lib/day_04/php/part_01.php
@@ -0,0 +1,94 @@
+<?php
+
+declare(strict_types=1);
+
+spl_autoload_register(fn(string $className) => require "{$className}.php");
+
+// Assumes executed from workspace root
+$input = new Input('input/day_04.txt');
+if ($input->contents === "") {
+    throw new RuntimeException("File not found");
+}
+
+$grid = $input->toGrid();
+
+$matchCount = 0;
+foreach ($grid->data as $y => $row) {
+    foreach ($row as $x => $char) {
+        if ($char !== 'X') {
+            continue;
+        }
+
+        $start = new Position($x, $y);
+
+        $possibleMatches = [];
+
+        $possibleMatches["north"] = $grid->getStringFromPositions([
+            $start,
+            $start->getNorth(),
+            $start->getNorth()->getNorth(),
+            $start->getNorth()->getNorth()->getNorth(),
+        ]);
+
+        $possibleMatches["east"] = $grid->getStringFromPositions([
+            $start,
+            $start->getEast(),
+            $start->getEast()->getEast(),
+            $start->getEast()->getEast()->getEast(),
+        ]);
+
+        $possibleMatches["south"] = $grid->getStringFromPositions([
+            $start,
+            $start->getSouth(),
+            $start->getSouth()->getSouth(),
+            $start->getSouth()->getSouth()->getSouth(),
+        ]);
+
+        $possibleMatches["west"] = $grid->getStringFromPositions([
+            $start,
+            $start->getWest(),
+            $start->getWest()->getWest(),
+            $start->getWest()->getWest()->getWest(),
+        ]);
+
+        $possibleMatches["north-east"] = $grid->getStringFromPositions([
+            $start,
+            $start->getNorthEast(),
+            $start->getNorthEast()->getNorthEast(),
+            $start->getNorthEast()->getNorthEast()->getNorthEast(),
+        ]);
+
+        $possibleMatches["north-west"] = $grid->getStringFromPositions([
+            $start,
+            $start->getNorthWest(),
+            $start->getNorthWest()->getNorthWest(),
+            $start->getNorthWest()->getNorthWest()->getNorthWest(),
+        ]);
+
+        $possibleMatches["south-east"] = $grid->getStringFromPositions([
+            $start,
+            $start->getSouthEast(),
+            $start->getSouthEast()->getSouthEast(),
+            $start->getSouthEast()->getSouthEast()->getSouthEast(),
+        ]);
+
+        $possibleMatches["south-west"] = $grid->getStringFromPositions([
+            $start,
+            $start->getSouthWest(),
+            $start->getSouthWest()->getSouthWest(),
+            $start->getSouthWest()->getSouthWest()->getSouthWest(),
+        ]);
+
+        $matchCount += array_reduce(
+            array: $possibleMatches,
+            callback: fn(int $acc, string $possibleMatch): int => match ($possibleMatch) {
+                "XMAS" => $acc + 1,
+                default => $acc,
+            },
+            initial: 0,
+        );
+    }
+}
+
+// ANSWER: 2517
+echo $matchCount;
diff --git a/2024/OCaml/lib/day_05/part_01.ml b/2024/OCaml/lib/day_05/part_01.ml
new file mode 100644
index 0000000..92bb105
--- /dev/null
+++ b/2024/OCaml/lib/day_05/part_01.ml
@@ -0,0 +1,23 @@
+(* Day 5: Part 1 *)
+
+(*
+    01. Parse pages that need updating into list, e.g. "75,47,61,53,29" -> [ 75; 47; 61; 53; 29; ]
+    02. Parse page ordering rules into DTOs, e.g. "47|53" -> {"before": 47, "after": 53}
+    03. Find all rules that have pages from the parsed page list on both sides, e.g. "47|53" is valid but "97|47" and "47|13" are not
+      - filter down to "before" values that are in page list
+      - filter down to "after" values that are in page list
+    04. Map across the page list and ensure that all rules for each page are upheld
+    05. Map across the rules for the current page and ensure that all rules are upheld
+      - filter rules down to rules with "before" equal to current page
+      - walk the page list and ensure that all "after" values do no appear before the "before" value
+      - return true if all rules are valid for the current page
+    06. Reduce result down to single boolean
+    07. IF FALSE, move on to next page in page list
+    08. IF TRUE, continue until all rules are validated
+    09. IF ALL RULES ARE NOT VALID FOR PAGE LIST, move on to next page list
+    10. IF ALL RULES ARE VALID FOR PAGE LIST, save middle number in page list
+    11. ONCE ALL PAGE LISTS HAVE BEEN PROCESSED, add all saved middle numbers
+    12. Return sum of middle numbers
+*)
+
+let solve _ = ()
diff --git a/2024/OCaml/lib/dune b/2024/OCaml/lib/dune
new file mode 100644
index 0000000..84e62ca
--- /dev/null
+++ b/2024/OCaml/lib/dune
@@ -0,0 +1,5 @@
+(library
+ (name AoC_2024)
+ (libraries re2))
+
+(include_subdirs qualified)
diff --git a/2024/OCaml/lib/file/read_input.ml b/2024/OCaml/lib/file/read_input.ml
new file mode 100644
index 0000000..0f7470b
--- /dev/null
+++ b/2024/OCaml/lib/file/read_input.ml
@@ -0,0 +1,11 @@
+let rec lines_from_channel ic =
+  try
+    let line = input_line ic in
+    line :: lines_from_channel ic
+  with End_of_file -> []
+
+let lines_from_file filename =
+  let channel = open_in filename in
+  let lines = lines_from_channel channel in
+  close_in channel;
+  lines
diff --git a/2024/OCaml/shell.nix b/2024/OCaml/shell.nix
new file mode 100644
index 0000000..aa955b6
--- /dev/null
+++ b/2024/OCaml/shell.nix
@@ -0,0 +1,42 @@
+{ }:
+let
+  config = {
+    allowUnfree = true;
+  };
+  pkgs = import <nixpkgs> { inherit config; };
+
+  # choose the ocaml version you want to use
+  ocamlPackages = pkgs.ocaml-ng.ocamlPackages_5_2;
+in
+pkgs.mkShell {
+  # build tools
+  nativeBuildInputs = with ocamlPackages; [
+    pkgs.opam
+    ocaml
+    findlib
+    dune_3
+  ];
+  # dependencies
+  buildInputs = with ocamlPackages; [
+    bisect_ppx
+    findlib
+    menhir
+    ocaml-lsp
+    earlybird
+    ocamlformat
+    ocamlgraph
+    odoc
+    ounit2
+    re2
+    utop
+
+    pkgs.gh # GitHub CLI
+
+    # Fallback language
+    pkgs.php84
+    pkgs.intelephense
+    pkgs.php84Packages.php-cs-fixer
+    pkgs.php84Packages.phpstan
+    pkgs.nodejs_18
+  ];
+}
diff --git a/2024/OCaml/templates/part.ml b/2024/OCaml/templates/part.ml
new file mode 100644
index 0000000..062c917
--- /dev/null
+++ b/2024/OCaml/templates/part.ml
@@ -0,0 +1,3 @@
+(* Day N: Part 1 *)
+
+let solve _ = ()
diff --git a/2024/OCaml/templates/test.ml b/2024/OCaml/templates/test.ml
new file mode 100644
index 0000000..0f50476
--- /dev/null
+++ b/2024/OCaml/templates/test.ml
@@ -0,0 +1,4 @@
+open OUnit2
+
+let tests = "test suite for day n part 1" >::: []
+let _ = run_test_tt_main tests
diff --git a/2024/OCaml/test/day_01_part_01.ml b/2024/OCaml/test/day_01_part_01.ml
new file mode 100644
index 0000000..824c95b
--- /dev/null
+++ b/2024/OCaml/test/day_01_part_01.ml
@@ -0,0 +1,27 @@
+open OUnit2
+open AoC_2024.Day_01.Part_01
+
+let tests =
+  "test suite for day 01 part 01"
+  >::: [
+         ("empty list is 0" >:: fun _ -> assert_equal 0 (solve [] []));
+         ( "distance between 0 and 1 is 1" >:: fun _ ->
+           assert_equal 1 (solve [ 0 ] [ 1 ]) );
+         ( "distance between 1 and 0 is 1" >:: fun _ ->
+           assert_equal 1 (solve [ 1 ] [ 0 ]) );
+         ( "smallest are paired, then next smallest, ..." >:: fun _ ->
+           assert_equal 0 (solve [ 1; 2; 3 ] [ 3; 2; 1 ]) );
+         (* See https://adventofcode.com/2024/day/1 *)
+         ( "solves example correctly" >:: fun _ ->
+           assert_equal 11 (solve [ 3; 4; 2; 1; 3; 3 ] [ 4; 3; 5; 3; 9; 3 ]) );
+         ( "same number is 0 distance apart" >:: fun _ ->
+           assert_equal 0 (calculate_distance 0 0) );
+         ( "same number is 0 distance apart" >:: fun _ ->
+           assert_equal 0 (calculate_distance 1 1) );
+         ( "distance is equal to abs(x - y)" >:: fun _ ->
+           assert_equal 1 (calculate_distance 0 1) );
+         ( "order of inputs doesn't matter" >:: fun _ ->
+           assert_equal 1 (calculate_distance 1 0) );
+       ]
+
+let _ = run_test_tt_main tests
diff --git a/2024/OCaml/test/day_01_part_02.ml b/2024/OCaml/test/day_01_part_02.ml
new file mode 100644
index 0000000..f7340df
--- /dev/null
+++ b/2024/OCaml/test/day_01_part_02.ml
@@ -0,0 +1,17 @@
+open OUnit2
+open AoC_2024.Day_01.Part_02
+
+let test_solve =
+  "test suite for day 01 part 02"
+  >::: [
+         ("empty list is 0" >:: fun _ -> assert_equal 0 (solve [] []));
+         ( "ten x zero occurrances of ten" >:: fun _ ->
+           assert_equal 0 (solve [ 10 ] [ 1; 2; 3 ]) );
+         ( "two x three occurrances of two" >:: fun _ ->
+           assert_equal 6 (solve [ 2 ] [ 2; 2; 2 ]) );
+         (* See https://adventofcode.com/2024/day/1#part2 *)
+         ( "solves example correctly" >:: fun _ ->
+           assert_equal 31 (solve [ 3; 4; 2; 1; 3; 3 ] [ 4; 3; 5; 3; 9; 3 ]) );
+       ]
+
+let _ = run_test_tt_main test_solve
diff --git a/2024/OCaml/test/day_02_part_01.ml b/2024/OCaml/test/day_02_part_01.ml
new file mode 100644
index 0000000..36af248
--- /dev/null
+++ b/2024/OCaml/test/day_02_part_01.ml
@@ -0,0 +1,38 @@
+open OUnit2
+open AoC_2024.Day_02.Part_01
+
+let tests =
+  "test suite for day 2 part 1"
+  >::: [
+         ( "empty list should have no valid reports" >:: fun _ ->
+           assert_equal 0 (solve []) );
+         ( "valid report should count as one" >:: fun _ ->
+           assert_equal 1 (solve [ [ 7; 6; 4; 2; 1 ] ]) );
+         ( "example correct" >:: fun _ ->
+           assert_equal 2
+             (solve
+                [
+                  [ 7; 6; 4; 2; 1 ];
+                  [ 1; 2; 7; 8; 9 ];
+                  [ 9; 7; 6; 2; 1 ];
+                  [ 1; 3; 2; 4; 5 ];
+                  [ 8; 6; 4; 4; 1 ];
+                  [ 1; 3; 6; 7; 9 ];
+                ]) );
+         ( "all increasing" >:: fun _ ->
+           assert_equal true (check_report_safety [ 1; 2; 3 ]) );
+         ( "all decreasing" >:: fun _ ->
+           assert_equal true (check_report_safety [ 3; 2; 1 ]) );
+         ( "increasing and decreasing" >:: fun _ ->
+           assert_equal false (check_report_safety [ 1; 3; 2 ]) );
+         ( "change of at least one" >:: fun _ ->
+           assert_equal true (check_report_safety [ 1; 2; 3 ]) );
+         ( "no change" >:: fun _ ->
+           assert_equal false (check_report_safety [ 1; 1; 2 ]) );
+         ( "change of at most three" >:: fun _ ->
+           assert_equal true (check_report_safety [ 1; 2; 4; 7 ]) );
+         ( "change of at more than three" >:: fun _ ->
+           assert_equal false (check_report_safety [ 1; 5 ]) );
+       ]
+
+let _ = run_test_tt_main tests
diff --git a/2024/OCaml/test/day_03_part_01.ml b/2024/OCaml/test/day_03_part_01.ml
new file mode 100644
index 0000000..0db039a
--- /dev/null
+++ b/2024/OCaml/test/day_03_part_01.ml
@@ -0,0 +1,29 @@
+open OUnit2
+open AoC_2024.Day_03.Part_01
+
+let example_input =
+  "xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))"
+
+let test_find_mul _ =
+  assert_equal
+    [ "mul(2,4)"; "mul(5,5)"; "mul(11,8)"; "mul(8,5)" ]
+    (let result = find_mul example_input in
+     List.map (fun x -> Re2.Match.get_exn x ~sub:(`Index 0)) result)
+
+let test_extract_pairs _ =
+  assert_equal
+    [ (2, 4); (5, 5); (11, 8); (8, 5) ]
+    (let matches = find_mul example_input in
+     extract_pairs matches)
+
+let test_solve _ = assert_equal ~printer:string_of_int 161 (solve example_input)
+
+let tests =
+  "test suite for day 3 part 1"
+  >::: [
+         "muls extracted from example correctly" >:: test_find_mul;
+         "pairs extracted from matches" >:: test_extract_pairs;
+         "example correctly solved" >:: test_solve;
+       ]
+
+let _ = run_test_tt_main tests
diff --git a/2024/OCaml/test/day_04_part_01.ml b/2024/OCaml/test/day_04_part_01.ml
new file mode 100644
index 0000000..9f43df0
--- /dev/null
+++ b/2024/OCaml/test/day_04_part_01.ml
@@ -0,0 +1,141 @@
+open OUnit2
+open AoC_2024.Day_04.Part_01
+
+let example_input =
+  [
+    "MMMSXXMASM";
+    "MSAMXMSMSA";
+    "AMXSXMAAMM";
+    "MSAMASMSMX";
+    "XMASAMXAMM";
+    "XXAMMXXAMA";
+    "SMSMSASXSS";
+    "SAXAMASAAA";
+    "MAMMMXMMMM";
+    "MXMXAXMASX";
+  ]
+
+let is_in_bounds_tests =
+  let test_is_in_bounds expected length index _ =
+    let actual = is_in_bounds length index in
+    assert_equal ~printer:string_of_bool expected actual
+  in
+  [
+    "not in bounds if below 0" >:: test_is_in_bounds false 1 (-1);
+    "in bounds if gte 0 and lt length" >:: test_is_in_bounds true 1 0;
+    "not in bounds if eq length" >:: test_is_in_bounds false 1 1;
+    "not in bounds if gt length" >:: test_is_in_bounds false 1 2;
+  ]
+
+let calculate_num_of_matches_tests =
+  let test_calculate_num_of_matches expected line row_offset character _ =
+    let actual = calculate_num_of_matches line row_offset character in
+    assert_equal ~printer:string_of_int expected actual
+  in
+  [
+    "is 0 when no matches present"
+    >:: test_calculate_num_of_matches 0 "SMMX" 1 { index = 3; character = 'X' };
+    "is 1 when only one match present - top to bottom"
+    >:: (*
+      |.|X|.|
+      |.|M|.|
+      |.|A|.|
+      |.|S|.|
+    *)
+    test_calculate_num_of_matches 1 ".X..M..A..S." 3
+      { index = 1; character = 'X' };
+    "is 1 when only one match present - top to bottom edge"
+    >:: (*
+      |X|.|.|
+      |M|.|.|
+      |A|.|.|
+      |S|.|.|
+    *)
+    test_calculate_num_of_matches 1 "X..M..A..S.." 3
+      { index = 0; character = 'X' };
+    "is 1 when only one match present - bottom to top"
+    >:: (*
+      |.|S|.|
+      |.|A|.|
+      |.|M|.|
+      |.|X|.|
+    *)
+    test_calculate_num_of_matches 1 ".S..A..M..X." 3
+      { index = 10; character = 'X' };
+    "is 1 when only one match present - left to right"
+    >:: (*
+      |X|M|A|S|
+    *)
+    test_calculate_num_of_matches 1 "XMAS" 4 { index = 0; character = 'X' };
+    "is 1 when only one match present - right to left"
+    >:: (*
+      |S|A|M|X|
+    *)
+    test_calculate_num_of_matches 1 "SAMX" 4 { index = 3; character = 'X' };
+    "is 1 when only one match present - bottom right to top left"
+    >:: (*
+      |S|.|.|.|
+      |.|A|.|.|
+      |.|.|M|.|
+      |.|.|.|X|
+    *)
+    test_calculate_num_of_matches 1 "S....A....M....X" 4
+      { index = 15; character = 'X' };
+    "is 1 when only one match present - top left to bottom right"
+    >:: (*
+      |X|.|.|.|
+      |.|M|.|.|
+      |.|.|A|.|
+      |.|.|.|S|
+    *)
+    test_calculate_num_of_matches 1 "X....M....A....S" 4
+      { index = 0; character = 'X' };
+    "is 1 when only one match present - bottom left to top right"
+    >:: (*
+      |.|.|.|S|
+      |.|.|A|.|
+      |.|M|.|.|
+      |X|.|.|.|
+    *)
+    test_calculate_num_of_matches 1 "...S..A..M..X..." 4
+      { index = 12; character = 'X' };
+    "is 1 when only one match present - top right to bottom left"
+    >:: (*
+      |.|.|.|X|
+      |.|.|M|.|
+      |.|A|.|.|
+      |S|.|.|.|
+    *)
+    test_calculate_num_of_matches 1 "...X..M..A..S..." 4
+      { index = 3; character = 'X' };
+    "is 8 when matches present in all possible directions"
+    >:: (*
+            |S|.|.|S|.|.|S|
+            |.|A|.|A|.|A|.|
+            |.|.|M|M|M|.|.|
+            |S|A|M|X|M|A|S|
+            |.|.|M|M|M|.|.|
+            |.|A|.|A|.|A|.|
+            |S|.|.|S|.|.|S|
+    *)
+    test_calculate_num_of_matches 8
+      "S..S..S.A.A.A...MMM..SAMXMAS..MMM...A.A.A.S..S..S" 7
+      { index = 24; character = 'X' };
+  ]
+
+let solve_tests =
+  let test_solve expected lines _ =
+    let actual = solve lines in
+    assert_equal ~printer:string_of_int expected actual
+  in
+  [
+    "example is solved correctly" >:: test_solve 18 example_input;
+    "minimal example is solved correctly"
+    >:: test_solve 4 [ "..X..."; ".SAMX."; ".A..A."; "XMAS.S"; ".X...." ];
+  ]
+
+let tests =
+  "test suite for day 4 part 1"
+  >::: is_in_bounds_tests @ calculate_num_of_matches_tests @ solve_tests
+
+let _ = run_test_tt_main tests
diff --git a/2024/OCaml/test/day_05_part_01.ml b/2024/OCaml/test/day_05_part_01.ml
new file mode 100644
index 0000000..0f50476
--- /dev/null
+++ b/2024/OCaml/test/day_05_part_01.ml
@@ -0,0 +1,4 @@
+open OUnit2
+
+let tests = "test suite for day n part 1" >::: []
+let _ = run_test_tt_main tests
diff --git a/2024/OCaml/test/dune b/2024/OCaml/test/dune
new file mode 100644
index 0000000..8d01938
--- /dev/null
+++ b/2024/OCaml/test/dune
@@ -0,0 +1,8 @@
+(tests
+ (names day_01_part_01
+        day_01_part_02
+        day_02_part_01
+        day_03_part_01
+        day_04_part_01)
+ (modes byte exe)
+ (libraries AoC_2024 ounit2))
diff --git a/2024/_input/day_01.txt b/2024/_input/day_01.txt
new file mode 100644
index 0000000..fd6ff80
--- /dev/null
+++ b/2024/_input/day_01.txt
@@ -0,0 +1,1000 @@
+17633   15737
+79440   47531
+44767   73309
+86871   26386
+66575   90774
+31637   38259
+89855   50198
+81829   20253
+95071   98569
+34163   43719
+28696   84802
+10975   89855
+48232   15737
+14078   99983
+40882   73431
+75659   94769
+85341   13345
+92610   16338
+18043   59463
+60606   24540
+22376   46760
+14535   24785
+26022   94769
+90745   76304
+94386   84190
+22699   50602
+48716   38259
+93599   63674
+24797   57698
+89866   94029
+13841   87991
+12612   31743
+22889   53500
+84705   43272
+50982   26386
+19312   68554
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diff --git a/2024/_input/day_02.txt b/2024/_input/day_02.txt
new file mode 100644
index 0000000..8a93f73
--- /dev/null
+++ b/2024/_input/day_02.txt
@@ -0,0 +1,1000 @@
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diff --git a/2024/_input/day_03.txt b/2024/_input/day_03.txt
new file mode 100644
index 0000000..567dd05
--- /dev/null
+++ b/2024/_input/day_03.txt
@@ -0,0 +1,6 @@
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