Problems from Southwestern Europe Regional Contest (SWERC) 2009

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Darts	88	34	39%	0.00	55	28	51%	7.4
Genetics	27	8	30%	0.00	13	8	62%	7.4
Happy Telephones	984	442	45%	0.02	302	270	89%	2.7
Haunted Graveyard	1109	74	7%	0.06	180	50	28%	8.6
Lights	32	15	47%	0.00	18	14	78%	5.3
Routing	12	8	67%	0.02	9	8	89%	5.7
Slalom	137	43	31%	0.03	39	25	64%	7.7
Stammering Aliens	403	115	29%	0.11	103	80	78%	5.9
Trick or Treat	804	228	28%	0.07	139	120	86%	4.2
Working at the Restaurant	1325	395	30%	0.01	367	286	78%	4.9