Problems from Hong Kong Regional Contest 2016 Practice Session

	Add	Remove

Name	Fastest	Shortest	Authors	Full Solves	Ratio	Difficulty	Languages
Arithmetic	0.00	17	1934	1548	80%	3.1Medium	en
Ball Tricks	0.08	3994	11	5	45%	7.7Hard	en
Circumsphere	0.00	700	72	57	79%	4.5Medium	en