Puzzle 2 2015 done

2015/puzzle-2.hs

@@ -0,0 +1,28 @@
+import qualified Data.Text as DT
+import qualified Data.List as DL
+
+parse_line s = map read_int members
+  where
+    delim = DT.pack "x"
+    content = DT.pack s
+    members = map DT.unpack $ DT.splitOn delim content
+    read_int = \x -> (read x) :: Int
+
+surface_area [l, w, h] = (2 * l * w) + (2 * w * h) + (2 * l * h)
+extra_area xs = x * y
+  where [x, y] = take 2 $ DL.sort xs
+total_area xs = (surface_area xs) + (extra_area xs)
+
+volume [l, w, h] = l * w * h
+ribbon_wrap xs = (2 * x) + (2 * y)
+  where [x, y] = take 2 $ DL.sort xs
+
+total_ribbon xs = (volume xs) + (ribbon_wrap xs)
+
+main = do
+  content <- readFile "2-input"
+  let dimensions = map parse_line $ lines content
+  let areas = sum $ map total_area dimensions
+  let ribbon = sum $ map total_ribbon dimensions
+  putStrLn $ "Round 1: " ++ (show areas)
+  putStrLn $ "Round 2: " ++ (show ribbon)