In the Show hint 3, there are mistake in the link "Partition problems". When I click, nothing happens and the link disappears.
Before clicking: <a href="http://en.wikipedia.org/wiki/Partition_problem">Partition problems</a>
After cliking: <a href="http://en.wikipedia.org/wiki/Partition_problem" style="display: none;">Partition problems</a>
Created at: 2014/04/10 18:44; Updated at: 2014/04/10 21:33