Problems from Hong Kong Regional Contest 2016 Practice Session

	Add	Remove

Name	Fastest	Shortest	Authors	Full Solves	Ratio	Difficulty	Languages
Arithmetic	0.00	17	1924	1540	80%	3.1Medium	en
Ball Tricks	0.08	3994	12	5	42%	8.0Hard	en
Circumsphere	0.00	700	73	58	79%	4.3Medium	en