chen yihan
@chenyihan_2010
China, Changchun
Joined Apr 2022
World Rank: #16827 (1.9 points)
Institution: dongshifuxiao
Activity over the last year
Effectiveness
- Problems solved
- 17
- Solutions submitted
- 58
China, Changchun
Joined Apr 2022
World Rank: #16827 (1.9 points)
Institution: dongshifuxiao