Problems from Hong Kong Regional Contest 2016

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Colourful Graph	482	108	22%	0.01	91	58	64%	6.0
Doors	2187	450	21%	0.01	184	140	76%	6.4
Peak Tower	731	44	6%	0.07	60	20	33%	8.6
Peak Tram	634	157	25%	0.04	97	72	74%	6.0
Perfect k-ary Tree	320	71	22%	0.17	76	43	57%	8.6
Playing with Numbers	1343	491	37%	0.01	159	140	88%	4.7
Scaffolding	170	47	28%	0.01	42	26	62%	6.2
Slim Cut	250	83	33%	0.08	53	40	75%	6.2
Special Tour	276	36	13%	0.00	51	28	55%	6.7
Taboo	1605	279	17%	0.01	131	92	70%	7.5
Team Up	1045	237	23%	0.06	150	117	78%	5.5