Comment on a problem or solution
Awarded to cdeliu on 22 Oct 2018
Create a problem
Solve all the problems in CUP Challenge
Awarded to cdeliu on 21 Oct 2018
Provide your first answer ever to someone else's question
Like a problem or solution
Awarded to cdeliu on 18 Oct 2018
Solve a problem for the first time
Awarded to cdeliu on 17 Oct 2018
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