# nayuki/Project-Euler-solutions

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 {- - Solution to Project Euler problem 8 - Copyright (c) Project Nayuki. All rights reserved. - - https://www.nayuki.io/page/project-euler-solutions - https://github.com/nayuki/Project-Euler-solutions -} import Data.Char (ord) import Data.List (tails) adjacent = 13 main = putStrLn (show ans) ans = foldl1 max (map product wantedSubstrings) -- [7, 3, 1, 6, 7, 1, 7, 6, 5, 3, ...] digits = map (\c -> (ord c) - (ord '0')) bignumber -- (Starting from the right end) [[0,4,2,0,...,5,0], [3,0,4,2,...,4,5], [5,3,0,4,...,3,4], ...] wantedSubstrings = map (take adjacent) \$ drop adjacent \$ reverse \$ tails digits bignumber = "7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450"