Problems from Hong Kong Regional Contest 2016

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Colourful Graph	397	88	22%	0.01	76	46	61%	7.4
Doors	1822	383	21%	0.01	163	123	75%	5.4
Peak Tower	702	44	6%	0.07	50	20	40%	8.5
Peak Tram	503	123	24%	0.04	82	58	71%	5.5
Perfect k-ary Tree	237	61	26%	0.17	59	34	58%	8.1
Playing with Numbers	1056	402	38%	0.01	140	121	86%	4.6
Scaffolding	104	27	26%	0.01	29	19	66%	6.3
Slim Cut	216	74	34%	0.08	46	35	76%	6.5
Special Tour	190	32	17%	0.01	39	24	62%	6.4
Taboo	1323	234	18%	0.01	109	75	69%	6.8
Team Up	868	201	23%	0.06	121	92	76%	6.3