Functional Programming Contest - September'14

比赛链接

Ａ题

 -- Enter your code here. Read input from STDIN. Print output to STDOUT
 main = do
     x <- getLine
     y <-  getLine
     putStrLn $ reverse $ foldl (\acc (x, y) -> [y]++[x]++acc) [] $ zip x y

Ｂ题

1 -- Enter your code here. Read input from STDIN. Print output to STDOUT
2 import Data.List
3 main = do
4     inputdata <- getLine
5     putStrLn . concat . map (\xs -> f (head xs) (length xs)) . group $ inputdata
6         where
7             f ch len
8                 | len == 1 = [ch]
9                 | otherwise = [ch] ++ show len

Ｃ题

 -- Enter your code here. Read input from STDIN. Print output to STDOUT
 import Data.Char
 main::IO ()
 main = getContents >>= print . (\[n, k] -> superDigit ((read k) * getStrSum(n))) . words

 superDigit::Int -> Int
 superDigit n
     | n < 10 = n
     | otherwise = superDigit . getSum $ n

 getSum::Int -> Int
 getSum 0 = 0
 getSum n  = (n `rem` 10) + getSum ( n `div` 10)

 getStrSum::String -> Int
 getStrSum [] = 0
 getStrSum (x:xs) = ord x - ord '' + getStrSum xs 

Ｄ题

Ｅ题