Problems from Hong Kong Regional Contest 2016 Practice Session

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Arithmetic 2770 790 29% 0.00 815 625 77% 3.9
Ball Tricks 62 2 3% 0.30 2 1 50% 8.0
Circumsphere 129 42 33% 0.00 37 31 84% 4.2