Problems from Central Europe Regional Contest (CERC) 2012

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Chemist's vows	305	79	26%	0.00	88	68	77%	5.3
Conservation	489	182	37%	0.27	105	91	87%	4.5
Darts	1237	598	48%	0.03	462	400	87%	2.6
Graphic Madness	63	11	17%	0.01	14	11	79%	6.6
Jewel Heist	88	24	27%	0.84	27	21	78%	6.5
Kingdoms	271	62	23%	0.29	72	42	58%	6.7
Non-boring sequences	629	189	30%	0.07	106	69	65%	6.8
The Dragon and the Knights	105	36	34%	0.20	35	33	94%	4.0
Who Wants to Live Forever?	223	23	10%	0.01	45	21	47%	7.6
Word Equations	117	21	18%	0.05	33	20	61%	8.3