yfs yfs
@yfsyfs
China, Beijin
Joined Feb 2020
World Rank: #122621 (0 points)
Institution: PKU
Activity over the last year
Effectiveness
- Problems solved
- 0
- Solutions submitted
- 6
China, Beijin
Joined Feb 2020
World Rank: #122621 (0 points)
Institution: PKU