Problems from Central Europe Regional Contest (CERC) 2013

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Bus	3677	2000	54%	0.00	1992	1843	93%	1.7
Captain Obvious and the Rabbit-Man	48	18	38%	0.53	20	16	80%	7.0
Chain & Co.	44	12	27%	0.84	15	11	73%	6.5
Crane	141	79	56%	0.02	50	48	96%	3.7
Digraphs	214	56	26%	0.00	63	49	78%	6.8
Draughts	193	96	50%	0.01	82	74	90%	3.8
Escape	345	50	14%	0.72	48	17	35%	8.0
Magical GCD	676	178	26%	0.26	155	115	74%	5.7
Rubik's Rectangle	43	10	23%	0.33	12	8	67%	7.8
Subway	74	12	16%	0.68	20	10	50%	8.7
What does the fox say?	7432	3254	44%	0.00	2936	2663	91%	2.0