Problems from Central Europe Regional Contest (CERC) 2012

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Chemist's vows	323	87	27%	0.00	91	71	78%	5.1
Conservation	643	214	33%	0.27	128	113	88%	4.2
Darts	1274	613	48%	0.03	475	413	87%	2.6
Graphic Madness	63	11	17%	0.01	14	11	79%	6.7
Jewel Heist	97	27	28%	0.84	30	23	77%	7.2
Kingdoms	273	64	23%	0.29	74	44	59%	6.2
Non-boring sequences	644	195	30%	0.07	114	75	66%	6.3
The Dragon and the Knights	108	37	34%	0.20	37	34	92%	4.8
Who Wants to Live Forever?	224	24	11%	0.01	46	22	48%	7.5
Word Equations	118	22	19%	0.05	34	21	62%	8.2