Done day 2

[advent-of-code-17.git] / adventofcode1702 / app / advent02.hs

diff --git a/adventofcode1702/app/advent02.hs b/adventofcode1702/app/advent02.hs
new file mode 100644 (file)
index 0000000..c7a4348
--- /dev/null
+++ b/adventofcode1702/app/advent02.hs
@@ -0,0 +1,44 @@
+module Main(main) where
+
+import Text.Parsec 
+import Text.ParserCombinators.Parsec.Number
+
+
+main :: IO ()
+main = do 
+        text <- readFile "data/advent02.txt"
+        let sheet = successfulParse $ parseFile text
+        print $ part1 sheet
+        print $ part2 sheet
+
+
+part1 :: [[Int]] -> Int
+part1 = sum . map p1cSum
+
+part2 :: [[Int]] -> Int
+part2 = sum . map p2cSum
+
+
+p1cSum :: [Int] -> Int
+p1cSum row = (maximum row) - (minimum row)
+
+p2cSum :: [Int] -> Int
+p2cSum digits = sum [a `div` b | a <- digits, b <- digits, a /= b, a `mod` b == 0]
+
+
+
+sFile = sLine `sepEndBy` newline 
+sLine = int `sepBy` onlySpaces
+
+onlySpaces = many (oneOf " \t")
+
+parseFile :: String -> Either ParseError [[Int]]
+parseFile input = parse sFile "(unknown)" input
+
+parseLine :: String -> Either ParseError [Int]
+parseLine input = parse sLine "(unknown)" input
+
+successfulParse :: Either ParseError [a] -> [a]
+successfulParse (Left _) = []
+successfulParse (Right a) = a
+