Problems from Hong Kong Regional Contest 2016 Practice Session

	Add	Remove

Name	Fastest	Shortest	Authors	Full Solves	Ratio	Difficulty	Languages
Arithmetic	0.00	17	1927	1541	80%	3.2Medium	en
Ball Tricks	0.08	3994	12	5	42%	8.2Hard	en
Circumsphere	0.00	700	73	58	79%	4.5Medium	en