day 4

aoc2022.cabal

@@ -131,4 +131,30 @@ test-suite day03aoctest
                      , HUnit
                      , split
   ghc-options:         -threaded -rtsopts -with-rtsopts=-N
+  default-language:    Haskell2010
+
+-- Day 4
+
+test-suite day04basictest
+  type:                exitcode-stdio-1.0
+  hs-source-dirs:      src/day04/test, src/day04
+  main-is:             Basic.hs
+  other-modules:       
+      Day4Lib
+  build-depends:       base
+                     , HUnit
+                     , split
+  ghc-options:         -threaded -rtsopts -with-rtsopts=-N
+  default-language:    Haskell2010
+
+test-suite day04aoctest
+  type:                exitcode-stdio-1.0
+  hs-source-dirs:      src/day04/test, src/day04
+  main-is:             AoCTest.hs
+  other-modules:       
+      Day4Lib
+  build-depends:       base
+                     , HUnit
+                     , split
+  ghc-options:         -threaded -rtsopts -with-rtsopts=-N
   default-language:    Haskell2010

data/input040.txt

@@ -0,0 +1,6 @@
+2-4,6-8
+2-3,4-5
+5-7,7-9
+2-8,3-7
+6-6,4-6
+2-6,4-8

src/day04/Day4Lib.hs

@@ -0,0 +1,49 @@
+module Day4Lib
+  ( Range (..),
+    parseRange,
+    parseRow,
+    --
+    processInput1,
+    processInput2,
+  )
+where
+
+import Data.List.Split (splitOn)
+
+-- import Debug.Trace ()
+
+newtype Range = Range (Int, Int) deriving (Show, Eq)
+
+parseRange :: String -> Range
+parseRange rs = let [s, e] = map read (splitOn "-" rs) in Range (s, e)
+
+parseRow :: String -> [Range]
+parseRow = map parseRange . splitOn ","
+
+isInside :: Range -> Range -> Bool
+isInside (Range (s1, e1)) (Range (s2, e2)) = s1 >= s2 && e1 <= e2
+
+isOverlapping :: Range -> Range -> Bool
+isOverlapping r1@(Range (s1, e1)) r2@(Range (s2, e2)) =
+  Range (s1, s1)
+    `isInside` r2
+    || Range (e1, e1)
+    `isInside` r2
+    || Range (s2, s2)
+    `isInside` r1
+    || Range (e2, e2)
+    `isInside` r1
+
+-- ####################
+
+processInput1 :: String -> Integer
+processInput1 = sum . map processRow1 . lines
+
+processRow1 :: String -> Integer
+processRow1 = (\[r1, r2] -> if r1 `isInside` r2 || r2 `isInside` r1 then 1 else 0) . parseRow
+
+processInput2 :: String -> Integer
+processInput2 = sum . map processRow2 . lines
+
+processRow2 :: String -> Integer
+processRow2 = (\[r1, r2] -> if r1 `isOverlapping` r2 then 1 else 0) . parseRow

src/day04/test/AoCTest.hs

@@ -0,0 +1,41 @@
+import Day4Lib (processInput1, processInput2)
+import System.IO
+import Test.HUnit
+
+testCases1 =
+  [ ("data/input040.txt", 2),
+    ("data/input041.txt", 444)
+  ]
+
+testCase1 (file, result) = do
+  withFile
+    file
+    ReadMode
+    ( \handle -> do
+        contents <- hGetContents handle
+        assertEqual "input test" result $ processInput1 contents
+    )
+
+testCases2 =
+  [ ("data/input040.txt", 4),
+    ("data/input041.txt", 801)
+  ]
+
+testCase2 (file, result) = do
+  withFile
+    file
+    ReadMode
+    ( \handle -> do
+        contents <- hGetContents handle
+        assertEqual "input test" result $ processInput2 contents
+    )
+
+tests =
+  TestList $
+    [TestCase (testCase1 c) | c <- testCases1]
+      ++ [TestCase (testCase2 c) | c <- testCases2]
+
+main :: IO ()
+main = do
+  runTestTT tests
+  return ()

src/day04/test/Basic.hs

@@ -0,0 +1,17 @@
+import Day4Lib
+import Test.HUnit
+
+trange = TestCase (assertEqual "1-2" (Range (1,2)) $ parseRange "1-2")
+trangel = TestCase (assertEqual "131231-215562" (Range (131231,215562)) $ parseRange "1-2")
+
+trow = TestCase (assertEqual "1-2,3-4" [Range (1,2), Range(3,4)] $ parseRow "1-2,3-4")
+trowl = TestCase (assertEqual "1-2,3-4" [Range (1,2), Range(34524,62345)] $ parseRow "1-2,34524-62345")
+
+tests =
+  TestList $
+    [trange, trow]
+
+main :: IO ()
+main = do
+  runTestTT tests
+  return ()

stack.yaml

@@ -17,8 +17,9 @@
 #
 # resolver: ./custom-snapshot.yaml
 # resolver: https://example.com/snapshots/2018-01-01.yaml
-resolver:
-  url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/20/2.yaml
+# resolver:
+#   url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/20/2.yaml
+resolver: lts-19.33
 
 # User packages to be built.
 # Various formats can be used as shown in the example below.
@@ -49,7 +50,7 @@ packages:
 # extra-package-dbs: []
 
 # Control whether we use the GHC we find on the path
-system-ghc: true
+# system-ghc: true
 #
 # Require a specific version of stack, using version ranges
 # require-stack-version: -any # Default

stack.yaml.lock

@@ -6,8 +6,7 @@
 packages: []
 snapshots:
 - completed:
-    sha256: fc39d8afc97531d53d87b10abdef593bce503c0c1e46c2e9a84ebcbc78bf8470
-    size: 648432
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/20/2.yaml
-  original:
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/20/2.yaml
+    sha256: 6d1532d40621957a25bad5195bfca7938e8a06d923c91bc52aa0f3c41181f2d4
+    size: 619204
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/19/33.yaml
+  original: lts-19.33