Make problem/<code>/ redirect to the version without /.
Make problem/<code>/ redirect to the version without /.

Deals with browser autocomplete.

Phoenix1369/site,monouno/site,DMOJ/site,monouno/site,monouno/site,Minkov/site,Phoenix1369/site,Minkov/site,Phoenix1369/site,DMOJ/site,monouno/site,Minkov/site,DMOJ/site,Phoenix1369/site,Minkov/site,DMOJ/site,monouno/site