Problems from Hong Kong Regional Contest 2016 Practice Session

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Arithmetic 4200 1271 30% 0.00 1279 1013 79% 3.9
Ball Tricks 68 4 6% 0.30 4 3 75% 7.9
Circumsphere 211 61 29% 0.00 61 46 75% 5.0