Fernan Bolando wrote: > Hi all > > If I have a number of list > example > list1 = [2,3] > list2 = [1,2] > list3 = [2,3,4] > list4 = [1,2,3] > > I want to create a list from the list above with n elements, > non-repeating and each elements index represents 1 of the elements > from the corresponding list so for the above input I would get. > > a = [3,2,4,1] > > ofcourse there may be several set that will satisfy the problem, so a > list of list that satisfies would be good. > > How do I do this in haskell? or is there a code snippet that seems to > work similarly?
Well you could simply concatenate all the lists using the (++) operator and then use Data.List.nub: http://haskell.org/ghc/docs/latest/html/libraries/base/Data-List.html#v:nub to remove duplicates. Erik -- ---------------------------------------------------------------------- Erik de Castro Lopo http://www.mega-nerd.com/ _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe