Problems from Central Europe Regional Contest (CERC) 2012

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Chemist's vows	814	216	27%	0.00	166	142	86%	4.1
Conservation	1152	420	36%	0.27	277	241	87%	4.4
Darts	1883	953	51%	0.03	731	651	89%	2.4
Graphic Madness	75	14	19%	0.01	20	14	70%	7.9
Jewel Heist	121	37	31%	0.84	40	30	75%	7.4
Kingdoms	325	74	23%	0.29	92	51	55%	8.1
Non-boring sequences	734	227	31%	0.07	153	103	67%	6.4
The Dragon and the Knights	194	50	26%	0.19	47	43	91%	4.8
Who Wants to Live Forever?	274	32	12%	0.01	62	29	47%	8.5
Word Equations	193	44	23%	0.05	58	35	60%	7.8