Problems from Central Europe Regional Contest (CERC) 2012

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Chemist's vows	672	179	27%	0.00	134	112	84%	4.0
Conservation	757	265	35%	0.27	162	140	86%	4.9
Darts	1407	691	49%	0.03	519	455	88%	2.5
Graphic Madness	68	12	18%	0.01	16	12	75%	7.4
Jewel Heist	101	30	30%	0.84	33	26	79%	7.0
Kingdoms	302	71	24%	0.29	84	49	58%	7.5
Non-boring sequences	674	205	30%	0.07	127	83	65%	6.4
The Dragon and the Knights	137	42	31%	0.20	40	36	90%	5.7
Who Wants to Live Forever?	250	29	12%	0.01	54	26	48%	7.2
Word Equations	127	24	19%	0.05	37	23	62%	7.8