Problems from Hong Kong Regional Online Preliminary 2016

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
0-1 Sequences	4954	740	15%	0.01	981	506	52%	7.1
A+B Problem	4843	492	10%	0.03	711	245	34%	8.2
Boxes	1148	409	36%	0.10	278	228	82%	4.4
Classrooms	859	227	26%	0.08	192	140	73%	6.3
Crazy Driver	617	246	40%	0.00	193	169	88%	3.6
Curious Cupid	1101	184	17%	0.08	158	106	67%	5.7
Dim Sum	70	33	47%	0.04	31	25	81%	6.3
k-Colouring of a Graph	151	39	26%	0.03	27	20	74%	8.0
Let's Meet	485	82	17%	0.00	70	45	64%	7.8
Palindromes	244	59	24%	0.09	66	31	47%	8.6
Take Two Stones	18218	11407	63%	0.00	9369	9015	96%	1.2