Problems from Hong Kong Regional Online Preliminary 2016

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
0-1 Sequences	11267	1781	16%	0.00	2319	1227	53%	6.0
A+B Problem	9470	935	10%	0.03	1365	451	33%	8.3
Boxes	1760	697	40%	0.06	472	394	83%	4.1
Classrooms	3537	666	19%	0.05	485	343	71%	6.2
Crazy Driver	858	329	38%	0.00	275	233	85%	4.0
Curious Cupid	1230	240	20%	0.08	196	135	69%	6.1
Dim Sum	97	39	40%	0.04	45	31	69%	7.4
k-Colouring of a Graph	215	54	25%	0.03	41	29	71%	8.6
Let's Meet	718	137	19%	0.00	101	63	62%	8.4
Palindromes	505	88	17%	0.09	132	43	33%	8.7
Take Two Stones	41824	25129	60%	0.00	21142	20322	96%	1.3