Day 1

.envrc

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+use flake

.gitignore

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+.bloop/
+.direnv/
+.metals/
+.vscode/
+out/

.scalafmt.conf

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+version = "3.0.5"
+runner.dialect = scala3

aoc/src/Day1.scala

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+import scala.io.Source
+object Day1 extends App:
+
+  val mesurements = Source
+    .fromURL(getClass.getResource("day1Input.txt"))
+    .mkString
+    .split('\n')
+    .map(_.toInt)
+    .toList
+
+  val total = mesurements.zip(mesurements.drop(1)).map(_ < _).count(identity)
+
+  println(s"Part 1: $total")
+
+  val windows = mesurements
+    .zip(mesurements.drop(1))
+    .zip(mesurements.drop(2))
+    .map { case ((m1, m2), m3) =>
+      m1 + m2 + m3
+    }
+
+  val windowsTotal = windows.zip(windows.drop(1)).map(_ < _).count(identity)
+
+  println(s"Part 2: $windowsTotal")

build.sc

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+import mill._, scalalib._
+
+object aoc extends ScalaModule {
+  def scalaVersion = "3.1.0"
+}

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1638122382,
+        "narHash": "sha256-sQzZzAbvKEqN9s0bzWuYmRaA03v40gaJ4+iL1LXjaeI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "74f7e4319258e287b0f9cb95426c9853b282730b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1638376152,
+        "narHash": "sha256-ucgLpVqhFnClH7YRUHBHnmiOd82RZdFR3XJt36ks5fE=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "6daa4a5c045d40e6eae60a3b6e427e8700f1c07f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+
+        millWithJdk11 = pkgs.mill.override { jre = pkgs.jdk11; };
+
+        inputs = with pkgs; [
+          millWithJdk11
+        ];
+      in
+      {
+        devShell = pkgs.mkShell {
+          buildInputs = inputs;
+          shellHook = ''
+            set -a
+            JAVA_HOME=${pkgs.jdk11}
+            set +a
+          '';
+        };
+      }
+    );
+}

shell.nix

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+(import (
+  fetchTarball {
+    url = "https://github.com/edolstra/flake-compat/archive/99f1c2157fba4bfe6211a321fd0ee43199025dbf.tar.gz";
+    sha256 = "0x2jn3vrawwv9xp15674wjz9pixwjyj3j771izayl962zziivbx2"; }
+) {
+  src =  ./.;
+}).shellNix