Improve dune-project dependency specifications.

bin/day2405.ml

@@ -1,19 +1,16 @@
 module IntSet = Set.Make (Int)
-module IntMap = Map.Make (Int)
 
 (** [add_rule a b m] adds the rule that [a] must appear before [b] to the rule
-    map [m]. *)
-let add_rule a b =
-  let update_rule = function
-    | None -> Some (IntSet.singleton b)
-    | Some s -> Some (IntSet.add b s)
-  in
-  IntMap.update a update_rule
+    map [m]. Returns the updated map [m] *)
+let add_rule a b m =
+  match Hashtbl.find_opt m a with
+  | None -> Hashtbl.add m a (IntSet.singleton b)
+  | Some s -> Hashtbl.replace m a (IntSet.add b s)
 
 (** [find_rule a b m] returns [true] if the rule map [m] says that [a] should
     appear before [b]. *)
 let find_rule a b m =
-  match IntMap.find_opt a m with
+  match Hashtbl.find_opt m a with
   | Some s -> ( match IntSet.find_opt b s with Some _ -> true | None -> false)
   | None -> false
 
@@ -43,15 +40,18 @@ let rec is_page_order_valid m pages =
     [tail] starts the line after the empty line. *)
 let parse_rules =
   let re = Str.regexp_string "|" in
-  let rec impl acc = function
-    | "" :: t -> (acc, t)
+  let m = Hashtbl.create 17 in
+  let rec impl = function
+    | "" :: t -> (m, t)
     | [] -> failwith "parse_rules.impl"
     | h :: t -> (
         match List.map int_of_string (Str.split re h) with
-        | [ a; b ] -> impl (add_rule a b acc) t
+        | [ a; b ] ->
+            add_rule a b m;
+            impl t
         | _ -> failwith "parse_rules.impl")
   in
-  impl IntMap.empty
+  impl
 
 (** [parse_page_orders lst] parses a list of page orders.  *)
 let parse_page_orders =

dune-project

@@ -20,7 +20,17 @@
  (synopsis "Implementation of AoC competitions in OCaml")
  (description
   "Implementation of solutions to various Advent of Code exercises written in OCaml")
- (depends ocaml dune)
+ (depends
+  (ocaml
+   (>= 5.2))
+  dune
+  (ocamlformat
+   (and
+    :dev
+    (= 0.26.2)))
+  (odoc :build)
+  (utop :dev)
+  (ocaml-lsp-server :dev))
  (tags
   (advent-of-code ocaml)))