From ea7cc85052e41f2ca57b581a8cfc9ac36d4bfbd6 Mon Sep 17 00:00:00 2001
From: Klotz <julius.klotz01@sap.com>
Date: Tue, 2 Dec 2025 22:54:16 +0100
Subject: [PATCH] initial commit with day1 solution

---
 README.md            |    2 -
 aoc25.opam           |   32 +
 bin/dune             |    4 +
 bin/main.ml          |    2 +
 dune-project         |   26 +
 inputs/day1.txt      | 4498 ++++++++++++++++++++++++++++++++++++++++++
 lib/day1.ml          |   86 +
 lib/day1_improved.ml |  102 +
 lib/dune             |    4 +
 lib/reuse.ml         |    9 +
 10 files changed, 4763 insertions(+), 2 deletions(-)
 delete mode 100644 README.md
 create mode 100644 aoc25.opam
 create mode 100644 bin/dune
 create mode 100644 bin/main.ml
 create mode 100644 dune-project
 create mode 100644 inputs/day1.txt
 create mode 100644 lib/day1.ml
 create mode 100644 lib/day1_improved.ml
 create mode 100644 lib/dune
 create mode 100644 lib/reuse.ml

diff --git a/README.md b/README.md
deleted file mode 100644
index 60d2936..0000000
--- a/README.md
+++ /dev/null
@@ -1,2 +0,0 @@
-# aoc25_ocaml
-
diff --git a/aoc25.opam b/aoc25.opam
new file mode 100644
index 0000000..a43bbcb
--- /dev/null
+++ b/aoc25.opam
@@ -0,0 +1,32 @@
+# This file is generated by dune, edit dune-project instead
+opam-version: "2.0"
+synopsis: "A short synopsis"
+description: "A longer description"
+maintainer: ["Maintainer Name <maintainer@example.com>"]
+authors: ["Author Name <author@example.com>"]
+license: "LICENSE"
+tags: ["add topics" "to describe" "your" "project"]
+homepage: "https://github.com/username/reponame"
+doc: "https://url/to/documentation"
+bug-reports: "https://github.com/username/reponame/issues"
+depends: [
+  "dune" {>= "3.20"}
+  "ocaml"
+  "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/username/reponame.git"
+x-maintenance-intent: ["(latest)"]
diff --git a/bin/dune b/bin/dune
new file mode 100644
index 0000000..60ee87a
--- /dev/null
+++ b/bin/dune
@@ -0,0 +1,4 @@
+(executable
+ (public_name aoc25)
+ (name main)
+ (libraries aoc25))
diff --git a/bin/main.ml b/bin/main.ml
new file mode 100644
index 0000000..74967d3
--- /dev/null
+++ b/bin/main.ml
@@ -0,0 +1,2 @@
+let () = Printf.printf "%i\n" Aoc25.Day1.day1_part1
+let () = Printf.printf "%i\n" Aoc25.Day1.day1_part2
diff --git a/dune-project b/dune-project
new file mode 100644
index 0000000..ce32bf4
--- /dev/null
+++ b/dune-project
@@ -0,0 +1,26 @@
+(lang dune 3.20)
+
+(name aoc25)
+
+(generate_opam_files true)
+
+(source
+ (github username/reponame))
+
+(authors "Author Name <author@example.com>")
+
+(maintainers "Maintainer Name <maintainer@example.com>")
+
+(license LICENSE)
+
+(documentation https://url/to/documentation)
+
+(package
+ (name aoc25)
+ (synopsis "A short synopsis")
+ (description "A longer description")
+ (depends ocaml)
+ (tags
+  ("add topics" "to describe" your project)))
+
+; See the complete stanza docs at https://dune.readthedocs.io/en/stable/reference/dune-project/index.html
diff --git a/inputs/day1.txt b/inputs/day1.txt
new file mode 100644
index 0000000..8e5c483
--- /dev/null
+++ b/inputs/day1.txt
@@ -0,0 +1,4498 @@
+L6
+L41
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\ No newline at end of file
diff --git a/lib/day1.ml b/lib/day1.ml
new file mode 100644
index 0000000..84076c8
--- /dev/null
+++ b/lib/day1.ml
@@ -0,0 +1,86 @@
+
+let input = Reuse.split_lines "inputs/day1.txt"
+
+
+let convert (s : string): int =
+  let first_char = s.[0] in 
+  let remainder = String.sub s 1 (String.length s - 1) in 
+  let distance = int_of_string remainder in
+  match first_char with 
+  | 'L' -> -distance
+  | 'R' -> distance
+  | _ -> raise (Invalid_argument "Invalid input") 
+
+  
+let count_if_zero (counter: int) (position: int) =
+  if position == 0 then counter + 1 else counter
+  
+let normalize_position (pos : int) (modulus : int) =
+  let result = pos mod modulus in
+  if result >= 0 then result else result + modulus
+
+let count_boundary_crossings (counter: int) (position: int) (movement: int) = 
+  let full_rotations = abs movement / 100 in
+  let remaining_movement = movement mod 100 in
+  let new_position = position + remaining_movement in
+  let boundary_crossings = 
+    if (new_position >= 100 && position < 100) || 
+       (new_position <= 0 && position > 0) then 1 else 0
+  in
+  counter + full_rotations + boundary_crossings
+
+
+
+let rec update (values: int list) (position: int) (counter: int) : int =
+  match values with
+  | [] -> counter
+  | x :: xs -> let new_position = normalize_position (position + x) 100 in 
+  update xs new_position (count_if_zero counter new_position)
+  
+let rec update_part2 (values: int list) (position: int) (counter: int) : int =
+  match values with
+  | [] -> counter
+  | x :: xs -> let new_position = normalize_position (position + x) 100 in
+  update_part2 xs new_position (count_boundary_crossings counter position x)
+
+let solve_part1 (lines: string list) : int =
+  update (List.map convert lines) 50 0
+
+let solve_part2 (lines: string list) : int =
+  update_part2 (List.map convert lines) 50 0
+
+let day1_part1 : int =
+  solve_part1 input
+  
+let day1_part2 : int =
+  solve_part2 input
+
+module Tests = struct
+let test_input = "L268
+L30
+R48
+L5
+R60
+L55
+L1
+L99
+R14
+L82"
+
+let test_lines = String.split_on_char '\n' test_input
+
+let run_tests () = 
+  let part1_result = solve_part1 test_lines in
+  let part2_result = solve_part2 test_lines in
+  if part1_result <> 3 then
+    failwith ("Part 1 test failed: expected 3, got " ^ string_of_int part1_result);
+    
+  if part2_result <> 8 then
+      failwith ("Part 2 test failed: expected 8, got " ^ string_of_int part2_result);
+    
+  Printf.printf "All tests passed!\n"
+end
+
+let () = Tests.run_tests()
+
+  
\ No newline at end of file
diff --git a/lib/day1_improved.ml b/lib/day1_improved.ml
new file mode 100644
index 0000000..345726d
--- /dev/null
+++ b/lib/day1_improved.ml
@@ -0,0 +1,102 @@
+(* Improved version of day1.ml with better code quality *)
+
+let input = Reuse.split_lines "inputs/day1.txt"
+
+(* Improved: Better function name and documentation *)
+let parse_direction (s : string) : int =
+  if String.length s = 0 then
+    invalid_arg "Empty direction string"
+  else
+    let direction = s.[0] in 
+    let distance_str = String.sub s 1 (String.length s - 1) in 
+    let distance = int_of_string distance_str in
+    match direction with 
+    | 'L' -> -distance  (* Negative for left turns *)
+    | 'R' -> distance   (* Positive for right turns *)
+    | _ -> invalid_arg ("Invalid direction: " ^ String.make 1 direction)
+
+(* Improved: More descriptive function name *)
+let count_if_at_origin (counter : int) (position : int) : int =
+  if position = 0 then counter + 1 else counter
+
+(* Improved: Better function name and clearer logic *)
+let normalize_position (position : int) (modulus : int) : int =
+  let result = position mod modulus in
+  if result >= 0 then result else result + modulus
+
+(* Improved: More descriptive function name and clearer logic *)
+let count_boundary_crossings (counter : int) (old_position : int) (movement : int) : int = 
+  Printf.printf "Position %i, movement %i, current counter %i\n" old_position movement counter;
+  
+  (* Count full rotations (every 100 units) *)
+  let full_rotations = abs movement / 100 in
+  let remaining_movement = movement mod 100 in
+  let new_position = old_position + remaining_movement in
+  
+  (* Count boundary crossings *)
+  let boundary_crossings = 
+    if (new_position >= 100 && old_position < 100) || 
+       (new_position <= 0 && old_position > 0) then 1 else 0
+  in
+  
+  counter + full_rotations + boundary_crossings
+
+(* Improved: More descriptive function names *)
+let rec solve_with_origin_counting (movements : int list) (position : int) (counter : int) : int =
+  match movements with
+  | [] -> counter
+  | movement :: remaining -> 
+      let new_position = normalize_position (position + movement) 100 in 
+      solve_with_origin_counting remaining new_position (count_if_at_origin counter new_position)
+  
+let rec solve_with_boundary_counting (movements : int list) (position : int) (counter : int) : int =
+  match movements with
+  | [] -> counter
+  | movement :: remaining -> 
+      let new_position = normalize_position (position + movement) 100 in
+      let new_counter = count_boundary_crossings counter position movement in
+      solve_with_boundary_counting remaining new_position new_counter
+
+(* Improved: Clear, descriptive function names *)
+let solve_part1 (lines : string list) : int =
+  let movements = List.map parse_direction lines in
+  solve_with_origin_counting movements 50 0
+
+let solve_part2 (lines : string list) : int =
+  let movements = List.map parse_direction lines in
+  solve_with_boundary_counting movements 50 0
+
+(* Main solutions *)
+let day1_part1 : int = solve_part1 input
+let day1_part2 : int = solve_part2 input
+
+(* Improved: Better test organization *)
+module Tests = struct
+  let test_input = "L268
+L30
+R48
+L5
+R60
+L55
+L1
+L99
+R14
+L82"
+
+  let test_lines = String.split_on_char '\n' test_input
+  
+  let run_tests () =
+    let part1_result = solve_part1 test_lines in
+    let part2_result = solve_part2 test_lines in
+    
+    if part1_result <> 3 then 
+      failwith ("Part 1 test failed: expected 3, got " ^ string_of_int part1_result);
+    
+    if part2_result <> 8 then 
+      failwith ("Part 2 test failed: expected 8, got " ^ string_of_int part2_result);
+    
+    Printf.printf "All tests passed!\n"
+end
+
+(* Run tests *)
+let () = Tests.run_tests ()
diff --git a/lib/dune b/lib/dune
new file mode 100644
index 0000000..25f0e57
--- /dev/null
+++ b/lib/dune
@@ -0,0 +1,4 @@
+(library
+ (name aoc25)
+ (inline_tests)
+ (preprocess (pps ppx_inline_test)))
\ No newline at end of file
diff --git a/lib/reuse.ml b/lib/reuse.ml
new file mode 100644
index 0000000..a40e226
--- /dev/null
+++ b/lib/reuse.ml
@@ -0,0 +1,9 @@
+let read filename =
+  let ic = open_in filename in
+  let length = in_channel_length ic in
+  let content = really_input_string ic length in
+  close_in ic;
+  content
+  
+let split_lines filename = 
+  String.split_on_char '\n' (read filename)
\ No newline at end of file