Problems from Central Europe Regional Contest (CERC) 2012

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Chemist's vows	775	196	25%	0.00	145	124	86%	3.9
Conservation	819	296	36%	0.27	176	153	87%	4.8
Darts	1496	739	49%	0.03	568	497	88%	2.5
Graphic Madness	70	12	17%	0.01	17	12	71%	7.4
Jewel Heist	107	33	31%	0.84	34	27	79%	6.7
Kingdoms	308	71	23%	0.29	85	49	58%	7.7
Non-boring sequences	695	212	31%	0.07	136	88	65%	6.4
The Dragon and the Knights	137	42	31%	0.20	40	36	90%	4.9
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%	7.6