Stub out day 24 in Crystal

Author: fwcd

.github/workflows/run.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         os: ['ubuntu-latest', 'macos-latest']
-        day: ['01', '02', '03', '04', '05', '06', '07', '08', '09', '10', '11', '12', '13', '14', '15', '16', '17', '18', '19', '20', '21', '22', '23']
+        day: ['01', '02', '03', '04', '05', '06', '07', '08', '09', '10', '11', '12', '13', '14', '15', '16', '17', '18', '19', '20', '21', '22', '23', '24']
         exclude:
         # TODO: Investigate why building Zig on macOS fails
         # https://github.com/fwcd/advent-of-code-2024/actions/runs/12202208638/job/34042374507

README.md

@@ -29,6 +29,7 @@ My solutions to the [Advent of Code 2024](https://adventofcode.com/2024), writte
 - [x] [**Day 21**](day21): [Scala](day21/src/day21.scala)
 - [ ] [**Day 22**](day22): [Dart](day22/src/day22.dart)
 - [x] [**Day 23**](day23): [Go](day23/src/day23.go)
+- [ ] [**Day 24**](day24): [Crystal](day24/src/day24.cr)
 
 ## Development
 

day24/derivation.nix

@@ -0,0 +1,18 @@
+{ stdenv, crystal }:
+  stdenv.mkDerivation {
+    name = "advent-of-code-2024-day24";
+    src = ./src;
+
+    buildInputs = [
+      crystal
+    ];
+
+    buildPhase = ''
+      crystal build day24.cr
+    '';
+
+    installPhase = ''
+      mkdir -p $out/bin
+      cp day24 $out/bin
+    '';
+  }

day24/flake.lock

@@ -0,0 +1,28 @@
+{
+  description = "Advent of Code 2024 - Day 24 solution";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  };
+
+  outputs = { self, nixpkgs }:
+    let
+      supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+    in {
+      packages = forAllSystems (system:
+        let
+          pkgs = import nixpkgs { inherit system; };
+        in {
+          default = pkgs.callPackage ./derivation.nix {};
+        }
+      );
+
+      apps = forAllSystems (system: {
+        default = {
+          type = "app";
+          program = "${self.packages.${system}.default}/bin/day24";
+        };
+      });
+    };
+}

day24/flake.nix

@@ -0,0 +1,10 @@
+x00: 1
+x01: 1
+x02: 1
+y00: 0
+y01: 1
+y02: 0
+
+x00 AND y00 -> z00
+x01 XOR y01 -> z01
+x02 OR y02 -> z02