src/advent_of_code/2024/1.hs

@@ -1,14 +1,13 @@
 -- https://adventofcode.com/2024/day/1
 
-import           Data.List (elemIndices, sort)
-import           GHC.IO    (unsafePerformIO)
+import           Data.List
+import           GHC.IO
 
 input :: FilePath
 input = "src/advent_of_code/2024/1.input"
 
--- entries :: ([Int], [Int])
--- entries = unzip $ map parse' $ unsafePerformIO $ lines <$> readFile input
-entries = unsafePerformIO $ lines <$> readFile input
+entries :: ([Int], [Int])
+entries = unzip $ map parse' $ unsafePerformIO $ lines <$> readFile input
 
 main :: IO ()
 main = do
@@ -21,10 +20,12 @@ main = do
 parse' :: String -> (Int, Int)
 parse' str = (read l, read r)
   where
-    [l, r] = words str
+    l = take' str
+    r = reverse $ take' $ reverse str
+    take' = takeWhile (/= ' ')
 
 solveP1 :: ([Int], [Int]) -> Int
-solveP1 (as, bs) = sum $ map abs $ zipWith subtract as' bs'
+solveP1 (as, bs) = sum $ zipWith (\i j -> abs (i - j)) as' bs'
   where
     as' = sort as
     bs' = sort bs

src/advent_of_code/2024/2.hs

@@ -1,56 +0,0 @@
--- https://adventofcode.com/2024/day/2
-
-{-# LANGUAGE OverloadedStrings #-}
-
-import           Data.List    hiding (lines)
-import           Data.Text    (Text, lines, pack, splitOn, unpack)
-import           Data.Text.IO (readFile)
-import           GHC.IO       (unsafePerformIO)
-import           Prelude      hiding (lines, readFile)
-
-entries :: [[Int]]
-entries = parse . unsafePerformIO $ lines <$> readFile "src/advent_of_code/2024/2.input"
-
-entries' :: [[Int]]
-entries' =  parse . unsafePerformIO $ lines <$> readFile "src/advent_of_code/2024/2f.input"
-
-parse :: [Text] -> [[Int]]
-parse = map (map (read . unpack) . splitOn " ")
-
-main :: IO ()
-main = do
-  entries <- parse . lines <$> readFile "src/advent_of_code/2024/2.input"
-  print "Advent of Code 2024 - Day 2"
-
-  print $ "Part 1: " <> show (solveP1 entries)
-  print $ "Part 2: " <> show (solveP2 entries)
-
-solveP1 :: [[Int]] -> Int
-solveP1 = length . filter (== True) . map safeReport
-
-safeReport :: [Int] -> Bool
-safeReport report = isSorted && adjacentLevelCheck
-  where
-    isSorted = sortedReportASC == report || sortedReportDESC == report
-    sortedReportASC = sort report
-    sortedReportDESC = reverse sortedReportASC
-
-    adjacentLevelCheck =
-      all (((== True) . (\n-> n>=1 && n<=3)) . abs)
-          (zipWith subtract report (tail report))
-
-
-solveP2 :: [[Int]] -> Int
-solveP2 = length . filter (== True) . map safeReport'
-
-safeReport' :: [Int] -> Bool
-safeReport' report =
-  or $ zipWith (&&) (map adjacentLevelCheck reports) (map isSorted reports)
-  where
-    isSorted report = report `elem` [sort report, reverse (sort report)]
-
-    adjacentLevelCheck report =
-      all (((== True) . (\n-> n>=1 && n<=3)) . abs)
-          (zipWith subtract report (tail report))
-
-    reports = map tail $ permutations report

src/advent_of_code/2024/2f.input

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