commit a3ae16a66e5b63efbd7583cde528c32644421ffa
Author: Riley Apeldoorn <me@riley.lgbt>
Date:   Thu Dec 2 11:35:13 2021 +0100

    Added day 1 and 2

diff --git a/1/example.txt b/1/example.txt
new file mode 100644
index 0000000..167e291
--- /dev/null
+++ b/1/example.txt
@@ -0,0 +1,10 @@
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diff --git a/1/input.txt b/1/input.txt
new file mode 100644
index 0000000..924eb2a
--- /dev/null
+++ b/1/input.txt
@@ -0,0 +1,2000 @@
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diff --git a/1/solution.hs b/1/solution.hs
new file mode 100644
index 0000000..6a0501a
--- /dev/null
+++ b/1/solution.hs
@@ -0,0 +1,22 @@
+import Data.List
+
+main :: IO ()
+main = readFile "1/input.txt" >>= print . solve . parse . lines
+
+parse :: [String] -> [Int]
+parse = map read
+
+solve :: [Int] -> (Int, Int)
+solve input = (f input, g input)
+    where f = countInc
+          g = countInc . map sum . slide 3
+
+countInc :: [Int] -> Int
+countInc (a : rest @ (b : _))
+    | a < b     = countInc rest + 1
+    | otherwise = countInc rest
+countInc _      = 0
+
+slide :: Int -> [Int] -> [[Int]]
+slide _ []   = []
+slide n list = take n list : slide n (tail list)
diff --git a/2/example.txt b/2/example.txt
new file mode 100644
index 0000000..b7172ac
--- /dev/null
+++ b/2/example.txt
@@ -0,0 +1,6 @@
+forward 5
+down 5
+forward 8
+up 3
+down 8
+forward 2
diff --git a/2/input.txt b/2/input.txt
new file mode 100644
index 0000000..d00e708
--- /dev/null
+++ b/2/input.txt
@@ -0,0 +1,1000 @@
+forward 6
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diff --git a/2/solution.hs b/2/solution.hs
new file mode 100644
index 0000000..feb050b
--- /dev/null
+++ b/2/solution.hs
@@ -0,0 +1,41 @@
+main :: IO ()
+main = readFile "2/input.txt" >>= print . solve . parse . lines
+
+parse :: [String] -> [Instruction]
+parse = map (parseLine . words)
+
+solve :: [Instruction] -> (Int,Int)
+solve input = (f input, g input)
+    where f = uncurry (*) . simulate Abs
+          g = uncurry (*) . simulate (Aim 0)
+
+data Nav = Aim Int 
+         | Abs
+
+data Instruction = Forward Int
+                 | Down Int
+                 | Up Int
+
+parseLine :: [String] -> Instruction
+parseLine [ s, x ]
+    | s == "forward" = Forward n
+    | s == "down"    = Down n
+    | s == "up"      = Up n
+    where
+        n = read x
+
+simulate :: Nav -> [Instruction] -> (Int,Int)
+simulate nav = iter nav (0,0)
+
+iter :: Nav -> (Int,Int) -> [Instruction] -> (Int,Int)
+iter _ r [] = r
+iter Abs (x,y) (i:is) = case i of
+        Forward n -> iter Abs (x+n,y)
+        Down n    -> iter Abs (x,y+n)
+        Up n      -> iter Abs (x,y-n)
+    $ is
+iter (Aim a) (x,y) (i:is) = case i of
+        Forward n -> iter (Aim a) (x+n,y+(a*n))
+        Down n    -> iter (Aim (a+n)) (x,y)
+        Up n      -> iter (Aim (a-n)) (x,y)
+    $ is
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..e7d2ce6
--- /dev/null
+++ b/README.md
@@ -0,0 +1 @@
+# Advent of Code 2021
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..5c2def8
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,7 @@
+{ pkgs ? import <nixpkgs> {} }: pkgs.mkShell {
+    nativeBuildInputs = with pkgs; [
+        haskell-language-server
+        cabal-install
+        ghc
+    ];
+}