Euler11.hs

{-# LANGUAGE NoMonomorphismRestriction #-}
module Main where
import Data.Array

lst = 
    [08,02,22,97,38,15,00,40,00,75,04,05,07,78,52,12,50,77,91,08
    ,49,49,99,40,17,81,18,57,60,87,17,40,98,43,69,48,04,56,62,00
    ,81,49,31,73,55,79,14,29,93,71,40,67,53,88,30,03,49,13,36,65
    ,52,70,95,23,04,60,11,42,69,24,68,56,01,32,56,71,37,02,36,91
    ,22,31,16,71,51,67,63,89,41,92,36,54,22,40,40,28,66,33,13,80
    ,24,47,32,60,99,03,45,02,44,75,33,53,78,36,84,20,35,17,12,50
    ,32,98,81,28,64,23,67,10,26,38,40,67,59,54,70,66,18,38,64,70
    ,67,26,20,68,02,62,12,20,95,63,94,39,63,08,40,91,66,49,94,21
    ,24,55,58,05,66,73,99,26,97,17,78,78,96,83,14,88,34,89,63,72
    ,21,36,23,09,75,00,76,44,20,45,35,14,00,61,33,97,34,31,33,95
    ,78,17,53,28,22,75,31,67,15,94,03,80,04,62,16,14,09,53,56,92
    ,16,39,05,42,96,35,31,47,55,58,88,24,00,17,54,24,36,29,85,57
    ,86,56,00,48,35,71,89,07,05,44,44,37,44,60,21,58,51,54,17,58
    ,19,80,81,68,05,94,47,69,28,73,92,13,86,52,17,77,04,89,55,40
    ,04,52,08,83,97,35,99,16,07,97,57,32,16,26,26,79,33,27,98,66
    ,88,36,68,87,57,62,20,72,03,46,33,67,46,55,12,32,63,93,53,69
    ,04,42,16,73,38,25,39,11,24,94,72,18,08,46,29,32,40,62,76,36
    ,20,69,36,41,72,30,23,88,34,62,99,69,82,67,59,85,74,04,36,16
    ,20,73,35,29,78,31,90,01,74,31,49,71,48,86,81,16,23,57,05,54
    ,01,70,54,71,83,51,54,69,16,92,33,48,61,43,52,01,89,19,67,48
    ]
table = listArray ((1,1),(20,20)) lst

euler11 =  max' [ max' [a,b,c,d] | x<-seq1, y<-seq1 
                , n0 <- seq0
                , let a = product' (\ d->table!(n0,y+d))
                , let b = product' (\ d->table!(x+d,n0))
                , let c = product' (\ d->table!(x+d,y+d))
                , let d = product' (\ d->table!((18-x)+d,(21-y)-d))
                ]
  where
     seq0     = [1..20]
     seq1     = [1..17]
     seq2     = [0..3]
     product' = \ f -> product $ map f seq2
     max'     = foldl1 max
main = print $ euler11