WE should have a feature to like or dislike a problem like spoj so that while practising people can choose questions which will help them get better faster
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Sounds good but then some people can misuse it by disliking the problems they couldn't solve
The vote system on SPOJ requires you to solve the problem before voting on it.
Oh I see, that would be good then
Unlike SPOJ, on codeforces one can copy other user's submissions.