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Earned on 20 Jul 2012 for first solving Problem 846. Calculate the Hamming distance between two stri....
Solve all the problems in CUP Challenge problem group.
Must have 50 solvers for a problem you created.
Create 10 problems.
Earned on 3 Mar 2013 for solving 500 problems.
Solve all the problems in Modeling and Simulation Challenge problem group.
Solve all the problems in Magic Numbers problem group.
Must receive 25 total likes for the problems you created.
Must receive 50 total likes for the solutions you submitted.
Must receive 10 likes for a solution you submitted.
Must receive 10 likes for a problem you created.