Problems from Central Europe Regional Contest (CERC) 2012

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Chemist's vows	690	191	28%	0.00	141	119	84%	4.0
Conservation	790	288	36%	0.27	171	149	87%	4.8
Darts	1435	708	49%	0.03	539	471	87%	2.5
Graphic Madness	68	12	18%	0.01	16	12	75%	7.4
Jewel Heist	103	32	31%	0.84	34	27	79%	6.6
Kingdoms	302	71	24%	0.29	84	49	58%	7.5
Non-boring sequences	681	208	31%	0.07	129	85	66%	6.4
The Dragon and the Knights	137	42	31%	0.20	40	36	90%	4.8
Who Wants to Live Forever?	251	30	12%	0.01	55	27	49%	7.1
Word Equations	131	28	21%	0.05	39	25	64%	7.5