Add day01, 2023 (haskell)HEADmaster

1 files changed, 17 insertions, 0 deletions

diff --git a/2023/haskell/day01/part1.hs b/2023/haskell/day01/part1.hs
new file mode 100644
index 0000000..65ea098
--- /dev/null
+++ b/2023/haskell/day01/part1.hs
@@ -0,0 +1,17 @@
+import Data.Char
+import System.Environment
+import System.IO
+
+main :: IO ()
+main = do
+  args <- getArgs
+  case args of
+    [filename] -> do
+      fh <- openFile filename ReadMode
+      lines <- lines <$> readFile filename
+      let digits = map (\line -> [c | c <- line, isDigit c ]) lines
+      let numbers = map (\line -> head line : [last line]) digits
+      let ints = map (\num -> read num :: Int ) numbers
+      let part1 = sum ints
+      print part1
+    _ -> putStrLn "Missing input filename."