minh thu ha scritto:
[...]
The approach I suggested is a bit overkill. You can indeed use L.lines
to split the input into lines then work on that.
But still, avoid the pair (Int, Bytestring). Instead, you can basically map
on each line the unsafeReadInt modified to :
- return the id
- return if it is one kind of id or the other kind.
so :
type UserId = Int
type MovieId = Int
unsafeReadInt :: Line -> Either MovieId UserId
Now you have a nice list [Either MovieId UserId] that
you need to transform into (MovieId, [UserId]).
Thanks, this seems a much better solution.
Manlio
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