Problems from Central Europe Regional Contest (CERC) 2013

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Bus	4561	2574	56%	0.00	2534	2366	93%	1.6
Captain Obvious and the Rabbit-Man	54	21	39%	0.13	25	19	76%	6.8
Chain & Co.	58	19	33%	0.24	22	17	77%	6.4
Crane	167	93	56%	0.02	62	59	95%	4.3
Digraphs	274	75	27%	0.00	83	64	77%	6.7
Draughts	434	162	37%	0.01	138	120	87%	4.5
Escape	367	58	16%	0.72	59	25	42%	7.2
Magical GCD	813	226	28%	0.26	201	144	72%	6.1
Rubik's Rectangle	51	13	25%	0.33	16	11	69%	7.4
Subway	98	19	19%	0.58	27	17	63%	7.7
What does the fox say?	9201	4061	44%	0.00	3656	3314	91%	2.1