day5 part 2

dumb actually just werks, simply takes a while
might write a better solution if I find the time

2023/day05/day05.hs

@@ -9,6 +9,7 @@ main = do
   input <- map (map words . lines) . splitOn "\n\n" <$> readFile "input"
   let (seeds, maps) = parse input
   print $ day5a maps seeds
+  print $ day5a maps (pairwise seeds)
 
 parse :: [[[String]]] -> ([Int], [SeedMap])
 parse = parseSeeds &&& map parseMap . tail
@@ -32,3 +33,8 @@ day5a :: [SeedMap] -> [Int] -> Int
 day5a maps = minimum . map f
   where
     f x = foldl applyMap x maps
+
+pairwise :: [Int] -> [Int]
+pairwise [] = []
+pairwise (x:y:xs) = take y [x ..] ++ pairwise xs
+pairwise _ = error "List length must be even"