Attention!
Solutions that you are programming now use a lot of processing power on the computer they are tested.
This is why you shouldn't test them on interactive servers such as melkki or melkinpaasi. 
You might also prefer outside processing to avoid clogging your home computer for days.

Here's a solution. Use the cluster at our university:

1. Check for a node with least load at: 
http://www.cs.helsinki.fi/ukko/hpc-report.txt
There's a list of "non reserved nodes with least load:".

2. Connect to the node with the following command:
ssh jgpyykko@ukko216.hpc.cs.helsinki.fi
(change your username from 'jgpyykko', and the number of the node you want to work on from '216')
You will see your home folder just as if you would have logged onto melkki.