Problems from Hong Kong Regional Online Preliminary 2016

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
0-1 Sequences	4157	641	15%	0.01	843	440	52%	7.2
A+B Problem	4114	383	9%	0.04	604	204	34%	8.4
Boxes	1116	394	35%	0.10	263	215	82%	4.4
Classrooms	815	214	26%	0.08	180	128	71%	6.4
Crazy Driver	598	242	40%	0.00	190	166	87%	3.6
Curious Cupid	1095	179	16%	0.08	154	102	66%	5.9
Dim Sum	61	31	51%	0.04	28	23	82%	7.3
k-Colouring of a Graph	141	38	27%	0.03	25	19	76%	8.0
Let's Meet	465	78	17%	0.00	67	44	66%	7.4
Palindromes	229	54	24%	0.09	62	28	45%	8.7
Take Two Stones	14996	9447	63%	0.00	7648	7357	96%	1.3