Obtain 50 solvers for a problem you have created
Awarded to Derik Zhou on 14 Dec 2020
Be the first to solve a problem
Awarded to Derik Zhou on 15 Apr 2015
Create a problem
Awarded to Derik Zhou on 15 Apr 2015
Comment on a problem or solution
Awarded to Derik Zhou on 15 Apr 2015
Like a problem or solution
Awarded to Derik Zhou on 15 Apr 2015
Solve a problem for the first time
Awarded to Derik Zhou on 29 Jan 2015
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