Day 02

day02/default.nix

@@ -0,0 +1,49 @@
+{ pkgs, lib, ... }:
+
+with lib;
+
+let 
+  guide = pipe (builtins.readFile ./input.txt) [
+    (splitString "\n")
+    (map (splitString " "))
+    (map (xs: { they = elemAt xs 0; you = elemAt xs 1; }))
+  ];
+
+  inherentValue = x: { A = 1; B = 2; C = 3; }.${x};
+  comparativeValue = { they, you }: if they == you then 3 else
+                                    if (they == "A" && you == "B")
+                                    || (they == "B" && you == "C")
+                                    || (they == "C" && you == "A") then 6 else
+                                    0;
+  score = match: comparativeValue match + inherentValue match.you;
+
+  equalizeValueType = x: { X = "A"; Y = "B"; Z = "C"; }.${x};
+
+  answer1 = pipe guide [
+    (map (match@{ you, ... }: match // { you = equalizeValueType you; }))
+    (map score)
+    (foldr add 0)
+    toString
+  ];
+
+  inherentValue2 = { they, you }: {
+    X = { A = 3; B = 1; C = 2; };
+    Y = { A = 1; B = 2; C = 3; };
+    Z = { A = 2; B = 3; C = 1; };
+  }.${you}.${they};
+  comparativeValue2 = x: { X = 0; Y = 3; Z = 6; }.${x};
+  score2 = match: comparativeValue2 match.you + inherentValue2 match;
+
+  answer2 = pipe guide [
+    (map score2)
+    (foldr add 0)
+    toString
+  ];
+
+in pkgs.writeText "answers" ''
+  Task1:
+    ${answer1}
+
+  Task2:
+    ${answer2}
+''

flake.nix

@@ -7,6 +7,7 @@
   in {
     packages.${system} = {
       day01 = pkgs.callPackage ./day01 {};
+      day02 = pkgs.callPackage ./day02 {};
     };
   };
 }