Problems from Hong Kong Regional Contest 2016 Practice Session

	Add	Remove

Name	Fastest	Shortest	Authors	Full Solves	Ratio	Difficulty	Languages
Arithmetic	0.00	17	2000	1606	80%	3.0Medium	en
Ball Tricks	0.08	3994	11	5	45%	7.9Hard	en
Circumsphere	0.00	700	73	59	81%	4.2Medium	en