Ruby Quiz, Haskell Solution: Maximum Sub-Array

Posted: August 30th, 2009 | Author: Michel Rijnders | Filed under: Haskell, Ruby Quiz | No Comments »

The Quiz

Given an array of integers, find the sub-array with maximum sum. (The complete, original quiz is here.)

A Haskell Solution

module Main where

import Data.List (inits, maximumBy, tails)
import System (getArgs)

maxSubArray :: [Int] -> [Int]
maxSubArray =
  maximumBy (\ x y -> compare (sum x) (sum y)) . concatMap inits . tails

main :: IO ()
main = do
  args <- getArgs
  print (maxSubArray (read (head args) :: [Int]))


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