Problems from Southwestern Europe Regional Contest (SWERC) 2009

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Darts	110	38	35%	0.00	68	32	47%	8.4
Genetics	28	9	32%	0.00	14	9	64%	7.3
Happy Telephones	1159	513	44%	0.02	358	324	91%	2.7
Haunted Graveyard	1751	214	12%	0.02	245	85	35%	8.0
Lights	32	15	47%	0.00	18	14	78%	5.4
Routing	12	8	67%	0.02	9	8	89%	5.7
Slalom	151	48	32%	0.03	46	30	65%	7.8
Stammering Aliens	706	205	29%	0.08	142	110	77%	5.6
Trick or Treat	1220	362	30%	0.07	214	191	89%	3.7
Working at the Restaurant	1909	534	28%	0.01	500	394	79%	4.6