Problems from Southwestern Europe Regional Contest (SWERC) 2009

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Darts	74	27	36%	0.00	50	24	48%	7.6
Genetics	27	8	30%	0.00	13	8	62%	7.3
Happy Telephones	952	422	44%	0.02	291	261	90%	2.6
Haunted Graveyard	911	69	8%	0.06	152	46	30%	8.6
Lights	31	14	45%	0.00	17	13	76%	5.8
Routing	12	8	67%	0.02	9	8	89%	5.7
Slalom	135	43	32%	0.03	38	25	66%	7.2
Stammering Aliens	401	114	28%	0.15	101	79	78%	5.8
Trick or Treat	772	216	28%	0.07	130	111	85%	4.2
Working at the Restaurant	1246	379	30%	0.01	342	270	79%	4.7