4 files changed, 1077 insertions, 0 deletions
diff --git a/Day4/CHANGELOG.md b/Day4/CHANGELOG.md
new file mode 100644
index 0000000..5f7ef6d
--- /dev/null
+++ b/Day4/CHANGELOG.md
@@ -0,0 +1,5 @@
+# Revision history for Day4
+
+## 0.1.0.0 -- YYYY-mm-dd
+
+* First version. Released on an unsuspecting world.
diff --git a/Day4/Day4.cabal b/Day4/Day4.cabal
new file mode 100644
index 0000000..6c9c1d3
--- /dev/null
+++ b/Day4/Day4.cabal
@@ -0,0 +1,34 @@
+cabal-version:      2.4
+name:               Day4
+version:            0.1.0.0
+
+-- A short (one-line) description of the package.
+-- synopsis:
+
+-- A longer description of the package.
+-- description:
+
+-- A URL where users can report bugs.
+-- bug-reports:
+
+-- The license under which the package is released.
+-- license:
+author:             Andreas Grois
+maintainer:         andi@grois.info
+
+-- A copyright notice.
+-- copyright:
+-- category:
+extra-source-files: CHANGELOG.md
+
+executable Day4
+    main-is:          Main.hs
+
+    -- Modules included in this executable, other than Main.
+    -- other-modules:
+
+    -- LANGUAGE extensions used by modules in this package.
+    -- other-extensions:
+    build-depends:    base ^>=4.16.3.0
+    hs-source-dirs:   app
+    default-language: Haskell2010
diff --git a/Day4/app/Main.hs b/Day4/app/Main.hs
new file mode 100644
index 0000000..62a9817
--- /dev/null
+++ b/Day4/app/Main.hs
@@ -0,0 +1,38 @@
+module Main (main) where
+
+import System.Environment
+import qualified Data.Bifunctor
+
+main :: IO ()
+main = getArgs >>= readFile . head >>= print . solveDay4
+
+solveDay4 :: String -> (Int, Int)
+solveDay4 x = (solveDay4Part1 x, solveDay4Part2 x)
+
+solveDay4Part1 :: String -> Int
+solveDay4Part1 = length . filter containingRanges . map parseRanges . lines
+
+newtype CleaningCells = CleaningCells (Integer,Integer)
+
+parseRanges :: String -> (CleaningCells, CleaningCells)
+parseRanges = Data.Bifunctor.bimap parseRange parseRange . splitAtChar ','
+
+splitAtChar :: Char -> String -> (String, String)
+splitAtChar c x = splitAtCharacter c ("",x)
+
+splitAtCharacter :: Char -> (String, String) -> (String, String)
+splitAtCharacter c (a, b:bs) = if b == c then (a,bs) else splitAtCharacter c (a++[b], bs)
+splitAtCharacter c (a,[]) = (a,[])
+
+parseRange :: String -> CleaningCells
+parseRange = CleaningCells . Data.Bifunctor.bimap read read . splitAtChar '-' 
+
+containingRanges :: (CleaningCells, CleaningCells) -> Bool
+containingRanges (CleaningCells (a1,b1), CleaningCells (a2,b2)) = (a1 >= a2 && b1 <= b2) || (a2 >= a1 && b2 <= b1)
+
+solveDay4Part2 :: String -> Int
+solveDay4Part2 = length . filter overlappingRanges . map parseRanges . lines
+
+overlappingRanges :: (CleaningCells, CleaningCells) -> Bool
+overlappingRanges (CleaningCells (a1,b1), CleaningCells (a2,b2)) = 
+    (a1 >= a2 && a1 <= b2) || (b1 >= a2 && b1 <= b2) || (a2 >= a1 && a2 <= b1) || (b2 >= a1 && b2 <= b1)
+\ No newline at end of file
diff --git a/Day4/input b/Day4/input
new file mode 100644
index 0000000..bab3d4d
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