Problems from Southwestern Europe Regional Contest (SWERC) 2009

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Darts	158	48	30%	0.00	91	39	43%	8.8
Genetics	49	15	31%	0.00	21	14	67%	7.1
Happy Telephones	2011	844	42%	0.02	618	536	87%	3.0
Haunted Graveyard	2932	320	11%	0.02	405	157	39%	8.1
Lights	41	18	44%	0.00	23	17	74%	6.3
Routing	13	9	69%	0.02	10	9	90%	5.7
Slalom	204	56	27%	0.03	55	37	67%	8.2
Stammering Aliens	894	254	28%	0.08	170	133	78%	6.5
Trick or Treat	1817	507	28%	0.07	311	278	89%	4.0
Working at the Restaurant	3063	877	29%	0.01	793	639	81%	4.4