Problems from Hong Kong Regional Online Preliminary 2016

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
0-1 Sequences	3814	598	16%	0.01	765	408	53%	7.1
A+B Problem	3628	357	10%	0.04	539	185	34%	8.4
Boxes	1069	377	35%	0.10	246	205	83%	4.3
Classrooms	782	205	26%	0.08	170	120	71%	6.5
Crazy Driver	590	236	40%	0.00	185	160	86%	3.8
Curious Cupid	1070	166	16%	0.08	139	90	65%	6.6
Dim Sum	57	29	51%	0.04	26	22	85%	6.5
k-Colouring of a Graph	141	38	27%	0.03	25	19	76%	7.9
Let's Meet	462	76	16%	0.00	65	42	65%	7.4
Palindromes	211	44	21%	0.09	55	26	47%	8.8
Take Two Stones	13307	8399	63%	0.00	6862	6607	96%	1.2