Problems from Southwestern Europe Regional Contest (SWERC) 2009

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Darts	132	44	33%	0.00	79	35	44%	8.7
Genetics	34	11	32%	0.00	16	10	62%	7.4
Happy Telephones	1531	637	42%	0.02	474	415	88%	2.9
Haunted Graveyard	1982	237	12%	0.02	290	103	36%	8.2
Lights	39	16	41%	0.00	21	15	71%	6.2
Routing	12	8	67%	0.02	9	8	89%	5.7
Slalom	177	52	29%	0.03	49	33	67%	7.5
Stammering Aliens	728	207	28%	0.08	148	112	76%	5.7
Trick or Treat	1314	410	31%	0.07	242	220	91%	3.7
Working at the Restaurant	2319	659	28%	0.01	608	483	79%	4.5