Provide your first answer ever to someone else's question
Awarded to xu ding on 13 Nov 2019
Answer 1 question that was unanswered for more than 30 days
Publish your first comment or rating
Awarded to xu ding on 09 Oct 2019
Solve a problem for the first time
Awarded to xu ding on 02 Feb 2018
NUMBER OF BADGES1
1 year ago | 0
3 years ago
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