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signal processing, non-linear optimization, ...
Earned on 31 Jul 2013 for liking .
Must have 50 solvers for a problem you created.
Solve all the problems in CUP Challenge problem group.
Create 10 problems.
Earned on 6 Feb 2013 for solving 500 problems.
Must receive 25 total likes for the problems you created.
Must receive 10 likes for a solution you submitted.
Must receive 50 total likes for the solutions you submitted.
Must receive 10 likes for a problem you created.