Problems from Hong Kong Regional Contest 2016

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Colourful Graph	418	95	23%	0.01	84	50	60%	7.1
Doors	1874	387	21%	0.01	172	126	73%	5.8
Peak Tower	702	44	6%	0.07	50	20	40%	8.5
Peak Tram	522	135	26%	0.04	89	65	73%	4.2
Perfect k-ary Tree	264	64	24%	0.17	64	37	58%	7.4
Playing with Numbers	1083	410	38%	0.01	147	127	86%	4.6
Scaffolding	128	33	26%	0.01	35	23	66%	6.1
Slim Cut	242	80	33%	0.08	49	38	78%	5.9
Special Tour	227	33	15%	0.01	40	25	62%	6.2
Taboo	1343	238	18%	0.01	116	79	68%	7.0
Team Up	874	205	23%	0.06	124	95	77%	6.2