Day 03

day03/default.nix

@@ -0,0 +1,70 @@
+{ pkgs, lib }:
+
+with lib;
+
+let
+  compartments = pipe (fileContents ./input.txt) [
+    (splitString "\n")
+  ];
+
+  splitAtMiddle = s: {
+    c1 = substring 0 ((stringLength s) / 2) s;
+    c2 = substring ((stringLength s) / 2) (stringLength s) s;
+  };
+  charsToSet = s: foldl (set: c: set // { ${c} = true; }) { } (stringToCharacters s);
+  getCommonChar = { c1, c2 }:
+    findSingle
+      (c: c2.${c} or false)
+      "Error: no common chars"
+      "Error: multiple chars"
+      (attrNames c1);
+  mapRange = min: max: f: i: if min <= i && i < max then f i else i;
+  transformRange = min: max: offset: i: mapRange min max (x: x + offset) i;
+
+  charValue = c: pipe c [
+    lib.strings.charToInt
+    (transformRange 65 91 (-(65 - 27)))
+    (transformRange 97 123 (-(97 - 1)))
+  ];
+
+  answer1 = pipe compartments [
+    (map splitAtMiddle)
+    (map (mapAttrs (_: charsToSet)))
+    (map getCommonChar)
+    (map charValue)
+    (foldr add 0)
+    toString
+  ];
+
+  chunksOf = n: l: if length l <= n
+                     then [l]
+                     else [(take n l)] ++ (chunksOf n (drop n l));
+  toA123 = l: {
+    a1 = elemAt l 0;
+    a2 = elemAt l 1;
+    a3 = elemAt l 2;
+  };
+  getCommonChar2 = { a1, a2, a3 }:
+    findSingle
+      (c: a2.${c} or false && a3.${c} or false)
+      "Error: no common chars"
+      "Error: multiple chars"
+      (attrNames a1);
+
+  answer2 = pipe compartments [
+    (chunksOf 3)
+    (map toA123)
+    (map (mapAttrs (_: charsToSet)))
+    (map getCommonChar2)
+    (map charValue)
+    (foldr add 0)
+    toString
+  ];
+
+in pkgs.writeText "answers" ''
+  Task1:
+    ${answer1}
+
+  Task2:
+    ${answer2}
+''

day03/input.txt

@@ -0,0 +1,300 @@
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+wrVpVVlCJVGMMJVdHWSdPSqqRwSQSP
+vCVrpvvGjlphBRmZBhmBhBND
+lqDcZGcSSqSqbDnccSLJgHgLRfnvvJRLmvWJ
+FVCFPChQzVhmsFBgddRgJBfdNfJdfv
+FzCpmTQzjQCThppTSttqDccMTDGcDG
+QCSGBGCrCsMBTCQwMGSfvvLNNnnVLDlNVNDdVdlr
+ZHtPffjWbqgtmnNdvljFnFhdVv
+JRWbmgmRJtmJMGGwSBBRRRfQ
+LqNrCfCQQhtgnPnc
+JWBrWrVlbWgbbtcb
+VwvTBprdrVJVNLNMNNqfqpjN
+bjVqdHrdqVHPsPNbqHbqNdjFGRwRGlttRtMtRtFFGMLHJw
+cfSpZnBZWQBZJlGRJJcwGMGL
+WWBhTMgDTZghVjgjssbrbddd

flake.nix

@@ -8,6 +8,7 @@
     packages.${system} = {
       day01 = pkgs.callPackage ./day01 {};
       day02 = pkgs.callPackage ./day02 {};
+      day03 = pkgs.callPackage ./day03 {};
     };
   };
-}
+}