Like a problem or solution
Awarded to Lee on 10 Jul 2014
Comment on a problem or solution
Solve a problem for the first time
Awarded to Lee on 02 Jul 2013
Be the first to solve a problem
Create a problem
Obtain 50 solvers for a problem you have created
Awarded to Lee on 14 Jan 2016
Solve all the problems in CUP Challenge
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