Start 2017!

1 files changed, 12 insertions, 0 deletions

diff --git a/2017/1.hs b/2017/1.hs
new file mode 100644
index 0000000..884e00e
--- /dev/null
+++ b/2017/1.hs
@@ -0,0 +1,12 @@
+import Control.Monad
+import Data.Char
+
+main :: IO ()
+main = do
+    input <- liftM (filter isDigit) $ readFile "1.in"
+
+    print $ sum $ map (\(a,b) -> read [a] * fromEnum (a == b)) $
+        zip input (tail (cycle input))
+
+    print $ sum $ map (\(a,b) -> read [a] * fromEnum (a == b)) $
+        zip input (drop (length input `div` 2) (cycle input))