hi there,
If this facility is available in SPOJ or don't know. But I want to give one suggestion regarding this topic.
We solve problem (specially in classical type) but there are solutions of same problem submitted by other programmer which are more efficient.
So if there will option for a user to see the code of other programmer for the problem which he had already solved. From this he can know the better and more efficient way of programming. it is better to hide the solution in challenge and partial output type problem but regarding classical if he had already solved the problem so he should see the more efficient way of solving the same problem.
