I would love to be able to use GHC 6.4 on SPOJ. I use 6.4 at home, and I have so far come across 6.2/6.4 problems with:
Data.MapText.PrintfControl.Monad.ST
These are easy cases where GHC 6.4 is backward compatible, unlike Data.Generic, say.
Sure!I just have to find a little free time, but GHC will be first in line for upgrades.
And don't forget about Data.Graph.Inductive: A whole bunch of graph algorithms at your disposal, more than in any other default library I think.But we still have to hope that those functions will be fast enough.