Improve Contest and Problem Model by using Many-to-Many relations.

[dheeraj135]

This problem was highlighted by #163. If we had many-to-many field for contest-problem relation, the solution would be much more elegant.

[shrirangpdeshmukh]

Okay, I will work on this!

[pranshukharkwal]

Hi @shrirangpdeshmukh
Any updates? Are you still working on it?

[shrirangpdeshmukh]

I am sorry ! I was not able to work much on this due to my ongoing end semester examinations.
The examination will be completed by Monday. I will complete this after Monday as soon as possible.