diff --git a/2024/day01/default.nix b/2024/day01/default.nix
new file mode 100644
index 0000000..001c208
--- /dev/null
+++ b/2024/day01/default.nix
@@ -0,0 +1,43 @@
+{ pkgs, lib }:
+
+with lib;
+
+let
+  input = pipe (fileContents ./input.txt) [
+    (splitString "\n")
+    (map (split "[[:space:]]+"))
+    (map (x: {
+      fst = elemAt x 0;
+      snd = elemAt x 2;
+    }))
+    (x: {
+      fst = catAttrs "fst" x;
+      snd = catAttrs "snd" x;
+    })
+  ];
+
+  abs = x: if x < 0 then -x else x;
+
+  answer1 = lib.pipe input [
+    (mapAttrs (_: xs: sort lessThan (map toInt xs)))
+    ({ fst, snd }: zipListsWith (x: y: abs (x - y)) fst snd)
+    (foldl add 0)
+    toString
+  ];
+
+  similarity = left: right: let
+    rightCount = foldl (acc: x: acc // { ${x} = (acc.${x} or 0) + 1; }) { } right;
+  in foldl add 0 (map (x: (toInt x) * rightCount.${x} or 0) left);
+
+  answer2 = lib.pipe input [
+    ({ fst, snd }: similarity fst snd)
+    toString
+  ];
+in
+  pkgs.writeText "answers" ''
+  Task1:
+    ${answer1}
+
+  Task2:
+    ${answer2}
+''
diff --git a/2024/day01/input.txt b/2024/day01/input.txt
new file mode 100644
index 0000000..ccd4dd4
--- /dev/null
+++ b/2024/day01/input.txt
@@ -0,0 +1,1000 @@
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diff --git a/2024/day02/default.nix b/2024/day02/default.nix
new file mode 100644
index 0000000..438ef1f
--- /dev/null
+++ b/2024/day02/default.nix
@@ -0,0 +1,40 @@
+{ pkgs, lib }:
+
+with lib;
+
+let
+  input = pipe (fileContents ./input.txt) [
+    (splitString "\n")
+    (map (split "[[:space:]]+"))
+    (map (filter (x: x != [])))
+    (map (map toInt))
+  ];
+
+  # - The levels are either all increasing or all decreasing.
+  # - Any two adjacent levels differ by at least one and at most three.
+  safeCondition = xs: let
+    zipped = zipLists xs (tail xs);
+  in (all ({ fst, snd }: let x = fst - snd; in  1 <= x && x <=  3) zipped)
+  || (all ({ fst, snd }: let x = fst - snd; in -1 >= x && x >= -3) zipped);
+
+  answer1 = lib.pipe input [
+    (filter safeCondition)
+    length
+    toString
+  ];
+
+  answer2 = lib.pipe input [
+    (filter (xs: let
+      variants = genList (i: (take i xs) ++ (drop (i + 1) xs)) (length xs);
+    in any safeCondition variants))
+    length
+    toString
+  ];
+in
+  pkgs.writeText "answers" ''
+  Task1:
+    ${answer1}
+
+  Task2:
+    ${answer2}
+''
diff --git a/2024/day02/input.txt b/2024/day02/input.txt
new file mode 100644
index 0000000..1b7e435
--- /dev/null
+++ b/2024/day02/input.txt
@@ -0,0 +1,1000 @@
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diff --git a/2024/flake.lock b/2024/flake.lock
new file mode 100644
index 0000000..d0b67c2
--- /dev/null
+++ b/2024/flake.lock
@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1733015953,
+        "narHash": "sha256-t4BBVpwG9B4hLgc6GUBuj3cjU7lP/PJfpTHuSqE+crk=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "ac35b104800bff9028425fec3b6e8a41de2bbfff",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/2024/flake.nix b/2024/flake.nix
new file mode 100644
index 0000000..7eebd92
--- /dev/null
+++ b/2024/flake.nix
@@ -0,0 +1,15 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs }: let
+    system = "x86_64-linux";
+    pkgs = nixpkgs.legacyPackages.${system};
+  in {
+    packages.${system} = {
+      day01 = pkgs.callPackage ./day01 { };
+      day02 = pkgs.callPackage ./day02 { };
+    };
+  };
+}
diff --git a/2024/template/default.nix b/2024/template/default.nix
new file mode 100644
index 0000000..7ab9076
--- /dev/null
+++ b/2024/template/default.nix
@@ -0,0 +1,24 @@
+{ pkgs, lib }:
+
+with lib;
+
+let
+  input = pipe (fileContents ./input.txt) [
+    (splitString "\n")
+  ];
+
+  answer1 = lib.pipe input [
+    (_: "TODO")
+  ];
+
+  answer2 = lib.pipe input [
+    (_: "TODO")
+  ];
+in
+  pkgs.writeText "answers" ''
+  Task1:
+    ${answer1}
+
+  Task2:
+    ${answer2}
+''
diff --git a/2024/template/input.nix b/2024/template/input.nix
new file mode 100644
index 0000000..e69de29