Problems from 2015 Southeast USA Regionals Division 1

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Airports	345	100	29%	0.11	100	73	73%	6.2
Checkers	113	24	21%	0.00	49	21	43%	8.1
Coverage	101	19	19%	0.04	24	17	71%	7.0
Gears	190	91	48%	0.00	100	87	87%	3.8
Grid	2673	1034	39%	0.01	784	685	87%	2.9
Hilbert Sort	226	62	27%	0.04	60	51	85%	5.1
Racing Gems	108	42	39%	0.03	46	33	72%	7.0
Simplicity	1613	643	40%	0.00	636	550	86%	2.7
Weightlifting	139	56	40%	0.00	36	34	94%	4.3