Problems from Southwestern Europe Regional Contest (SWERC) 2009

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Darts	107	37	35%	0.00	66	31	47%	8.6
Genetics	28	9	32%	0.00	14	9	64%	7.2
Happy Telephones	1136	498	44%	0.02	342	310	91%	2.6
Haunted Graveyard	1625	163	10%	0.02	236	77	33%	8.1
Lights	32	15	47%	0.00	18	14	78%	5.4
Routing	12	8	67%	0.02	9	8	89%	5.7
Slalom	141	47	33%	0.03	43	29	67%	7.2
Stammering Aliens	661	179	27%	0.11	132	104	79%	5.3
Trick or Treat	1027	306	30%	0.07	180	157	87%	3.8
Working at the Restaurant	1749	508	29%	0.01	473	375	79%	4.5