Day 01

.gitignore

@@ -0,0 +1 @@
+result

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2022 h7x4
+
+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.

README.md

@@ -0,0 +1,13 @@
+# Advent of code 2022 - Nix
+
+This is [Advent of Code 2022][aoc2022] (or at least as far as I'm able to get before having to deal with my exams...)
+
+They're written in nix this year.
+
+To run the code:
+
+```
+nix build github:h7x4/aoc2022#day01
+```
+
+[aoc2022]: https://adventofcode.com/2022

day01/default.nix

@@ -0,0 +1,32 @@
+{ pkgs, lib, ... }:
+
+with lib;
+
+let 
+  elves = pipe (builtins.readFile ./input.txt) [
+    (splitString "\n\n")
+    (map (splitString "\n"))
+    (map (map toInt))
+    (map (fold add 0))
+  ];
+
+  answer1 = toString (fold max (-1) elves);
+
+  max3 = abc: x: if x >= abc.a then { a = x; b = abc.a; c = abc.b; } else
+                 if x >= abc.b then { a = abc.a; b = x; c = abc.b; } else
+                 if x >= abc.c then { inherit (abc) a b; c = x; } else
+                 abc;
+
+  answer2 = pipe elves [
+    (foldl max3 { a = -1; b = -1; c = -1; })
+    (abc: abc.a + abc.b + abc.c)
+    toString
+  ];
+
+in pkgs.writeText "answers" ''
+  Task1:
+    ${answer1}
+
+  Task2:
+    ${answer2}
+''

flake.lock

@@ -0,0 +1,26 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1669834992,
+        "narHash": "sha256-YnhZGHgb4C3Q7DSGisO/stc50jFb9F/MzHeKS4giotg=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "596a8e828c5dfa504f91918d0fa4152db3ab5502",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-22.11",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,12 @@
+{
+  inputs.nixpkgs.url = "nixpkgs/nixos-22.11";
+
+  outputs = { self, nixpkgs }: let
+    system = "x86_64-linux";
+    pkgs = nixpkgs.legacyPackages.${system};
+  in {
+    packages.${system} = {
+      day01 = pkgs.callPackage ./day01 {};
+    };
+  };
+}