Programming Praxis – Billboard Challenge, Part 2

In today’s Programming Praxis challenge, our goal is to solve the second part of the billboard test, which is to find the fifth group of ten digits of e that sum up to 49. Reusing our definition of stream_e from the previous exercise, the solution becomes a simple one-liner:

main :: IO ()
main = print $ [x | x <- map (take 10) $ tails stream_e, sum x == 49] !! 4
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