Add day 1 part 2

2023/2-2.nix

@@ -0,0 +1,22 @@
+{ lib, ... } @ args:
+
+with builtins; with lib; rec {
+  games = (import ./2-1.nix args).games;
+
+  getMaxRGB = { maxRGB ? { red = 0; green = 0; blue = 0; }, rgbs }: if length rgbs == 0 then
+    maxRGB
+  else getMaxRGB {
+    maxRGB = mapAttrs (name: max (head rgbs).${name} or 0) maxRGB;
+    rgbs = sublist 1 (length rgbs - 1) rgbs;
+  };
+
+  makeOneIfZero = number: if number == 0 then 1 else number;
+
+  getPower = rgb: foldl' (accum: next: accum * makeOneIfZero next) 1 (attrValues rgb);
+
+  gamesMaxRGBs = map (game: getMaxRGB { rgbs = game.snd; }) games;
+
+  gamesPowers = map getPower gamesMaxRGBs;
+
+  result = foldl' add 0 gamesPowers;
+}