Solve a problem for the first time
Awarded to Da Huang on 10 Apr 2020
Contribute at least one answer each month for 3 consecutive months
Awarded to Da Huang on 07 Dec 2019
3 of your answers have been accepted
Awarded to Da Huang on 24 Mar 2019
Answer 3 questions that were unanswered for more than 30 days
Awarded to Da Huang on 21 Mar 2019
Provide your first answer ever to someone else's question
Awarded to Da Huang on 27 Feb 2019
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