Problems from 2015 Southeast USA Regionals Division 1

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Airports	385	109	28%	0.11	114	81	71%	6.8
Checkers	130	26	20%	0.00	59	23	39%	8.4
Coverage	120	24	20%	0.04	31	20	65%	7.1
Gears	204	98	48%	0.00	105	92	88%	3.6
Grid	3387	1293	38%	0.01	983	853	87%	3.0
Hilbert Sort	257	67	26%	0.04	72	56	78%	7.0
Racing Gems	115	45	39%	0.03	49	36	73%	6.5
Simplicity	1838	734	40%	0.00	725	630	87%	2.6
Weightlifting	149	59	40%	0.00	42	37	88%	5.0