Problems from Central Europe Regional Contest (CERC) 2013

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Bus	4881	2755	56%	0.00	2707	2530	93%	1.5
Captain Obvious and the Rabbit-Man	54	21	39%	0.13	25	19	76%	6.6
Chain & Co.	58	19	33%	0.24	22	17	77%	6.9
Crane	171	96	56%	0.02	65	62	95%	4.1
Digraphs	274	75	27%	0.00	83	64	77%	7.0
Draughts	438	166	38%	0.01	141	123	87%	4.5
Escape	375	60	16%	0.72	61	27	44%	7.9
Magical GCD	843	242	29%	0.26	208	150	72%	6.2
Rubik's Rectangle	51	13	25%	0.33	16	11	69%	7.5
Subway	98	19	19%	0.58	27	17	63%	8.1
What does the fox say?	9535	4212	44%	0.00	3799	3433	90%	2.2