1st commit on 030,068_haskell

2 files changed, 32 insertions, 0 deletions

diff --git a/challenge-068/stuart-little/haskell/ch-1.hs b/challenge-068/stuart-little/haskell/ch-1.hs
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+++ b/challenge-068/stuart-little/haskell/ch-1.hs
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+#!/usr/bin/env runghc
+
+-- run <script> <space-separated 0-1_words, one word per row>
+
+import System.Environment (getArgs,)
+import Data.List (transpose,)
+
+zeroRows :: Ord a => [[a]] -> [[a]]
+zeroRows mat = map (\l -> replicate (length l) (minimum l)) mat
+
+main = do
+  mat <- getArgs
+  putStrLn ((replicate 40 '-') ++ "\nInitial matrix:")
+  mapM_ putStrLn mat
+  putStrLn ((replicate 40 '-') ++ "\nTransformed matrix:")
+  mapM_ putStrLn $ zipWith (zipWith min) (zeroRows mat) (transpose $ zeroRows $ transpose mat)
diff --git a/challenge-068/stuart-little/haskell/ch-2.hs b/challenge-068/stuart-little/haskell/ch-2.hs
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+++ b/challenge-068/stuart-little/haskell/ch-2.hs
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+#!/usr/bin/env runghc
+
+-- run <script> <space-separated list entries>
+
+import System.Environment (getArgs,)
+import Data.List.Utils (join,)
+
+reorder :: [a] -> [a]
+reorder xs
+  |length xs <= 2 =xs
+  |otherwise =(head xs:l:(reorder m)) where
+     (m,(l:_)) = splitAt (length xs - 2) $ tail xs
+     
+main = do
+  args <- getArgs
+  putStrLn $ join " -> " $ reorder args