Problems from Southwestern Europe Regional Contest (SWERC) 2009

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Darts	95	36	38%	0.00	60	30	50%	7.4
Genetics	28	9	32%	0.00	14	9	64%	7.2
Happy Telephones	1070	474	44%	0.02	322	290	90%	2.7
Haunted Graveyard	1312	94	7%	0.02	208	57	27%	8.5
Lights	32	15	47%	0.00	18	14	78%	5.4
Routing	12	8	67%	0.02	9	8	89%	5.7
Slalom	139	45	32%	0.03	41	27	66%	7.8
Stammering Aliens	428	122	29%	0.11	109	84	77%	6.1
Trick or Treat	843	242	29%	0.07	149	128	86%	4.2
Working at the Restaurant	1524	450	30%	0.01	420	333	79%	4.8