Update day 2

02/gold.hs

@@ -1,3 +1,4 @@
+
 isSortedGradually' :: (Integer -> Integer -> Bool) -> Bool -> [Integer] -> Bool
 isSortedGradually' f mercy (x1:x2:xs) =
     (diff >= 1 && diff <= 3 && f x1 x2 && isSortedGradually' f mercy (x2:xs))
@@ -8,14 +9,8 @@ isSortedGradually' f mercy _ = True
 isSortedGradually f (x:xs) = isSortedGradually' f True (x:xs)
                           || isSortedGradually' f False xs
 
-isAscending  :: [Integer] -> Bool
-isAscending xs  = isSortedGradually (<) xs
-
-isDescending :: [Integer] -> Bool
-isDescending xs = isSortedGradually (>) xs
-
 isSafe :: [Integer] -> Bool
-isSafe xs = isAscending xs || isDescending xs
+isSafe xs = isSortedGradually (<) xs || isSortedGradually (>) xs
 
 main :: IO() 
 main = interact $ show . sum . map (fromEnum . isSafe . map read . words) . lines

02/silver.hs

@@ -1,20 +1,11 @@
 
-import Debug.Trace
-
-debug = flip trace
-
 isSortedGradually :: (Integer -> Integer -> Bool) -> [Integer] -> Bool
 isSortedGradually f (x1:x2:xs) = (f x1 x2) && diff >= 1 && diff <= 3 && isSortedGradually f (x2:xs)
     where diff = abs (x1 - x2)
-isSortedGradually f (x1:_) = True
 isSortedGradually f _ = True
 
-isAscending  :: [Integer] -> Bool
-isAscending = isSortedGradually (<)
-isDescending :: [Integer] -> Bool
-isDescending = isSortedGradually (>)
-
-ok xs = isAscending xs || isDescending xs
+isSafe :: [Integer] -> Bool
+isSafe xs = isSortedGradually (<) xs || isSortedGradually (>) xs
 
 main :: IO() 
-main = interact $ show . sum . map (fromEnum . ok . map (read :: (String -> Integer)) . words) . lines
+main = interact $ show . sum . map (fromEnum . isSafe . map (read :: (String -> Integer)) . words) . lines