hackerrank--- challenges/fp-update-list

纯属为了练习haskell，　竟然贴代码都没办法高亮。

Update the values of a list with their absolute values. The input and output portions will be handled automatically during grading. You only need to write a function with the recommended method signature.

Input Format
There are N integers, each on a new line. These are the N elements of the input array.

Output Format
N integers each on a new line; these are the absolute values of the input list, in that order.

Sample Input
2

-4

3

-1

23

-4

-54
Sample Output
2

4

3

1

23

4

54

Accpeted Code:

 -- Enter your code here. Read input from STDIN. Print output to STDOUT

 f arr = [if x >= 0 then x else -x | x <- arr] -- Complete this function here

 -- This section handles the Input/Output and can be used as it is. Do not modify it.

 main = do

    inputdata <- getContents

    mapM_ putStrLn $ map show $ f $ map (read :: String -> Int) $ lines inputdata

巴特西

hackerrank--- challenges/fp-update-list

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