On Sun, Jun 14, 2009 at 4:13 PM, Erik de Castro
Lopo
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.
Using Data.List.nub Data.List> nub [2,3,1,2,2,3,4,1,2,3] [2,3,1,4] that is not exactly what I want. list1 only has 2,3 has elements and list2 only has elements 1,2...this means the first element should only be 2 or 3 and the second element should only have 1 or 2...etc fernan -- http://www.fernski.com