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Earned on 25 Oct 2013 for having 50 or more solvers for Problem 589. Matrix indexing with two vectors of indices.
Earned on 28 Apr 2013 for creating 10 problems.
Solve 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.