Problems from Hong Kong Regional Online Preliminary 2016

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
0-1 Sequences	6185	921	15%	0.01	1215	620	51%	6.8
A+B Problem	6098	607	10%	0.03	862	291	34%	8.3
Boxes	1264	455	36%	0.10	312	258	83%	4.3
Classrooms	1022	270	26%	0.08	225	166	74%	6.3
Crazy Driver	633	255	40%	0.00	201	175	87%	3.6
Curious Cupid	1130	201	18%	0.08	166	113	68%	5.7
Dim Sum	86	35	41%	0.04	36	27	75%	6.5
k-Colouring of a Graph	162	40	25%	0.03	29	21	72%	8.4
Let's Meet	591	113	19%	0.00	85	51	60%	7.9
Palindromes	295	71	24%	0.09	72	32	44%	8.7
Take Two Stones	23236	14072	61%	0.00	11615	11179	96%	1.3