Problems from North American Invitational Programming Contest (NAIPC) 2015

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Area of Effect	164	12	7%	1.93	25	10	40%	8.7
Canyon Mapping	81	12	15%	0.08	12	8	67%	7.7
Extensive Or	76	39	51%	0.00	37	32	86%	5.0
Magic Checkerboard	1129	173	15%	0.07	233	148	64%	7.4
Primal Partitions	671	212	32%	0.01	180	141	78%	5.5
Rainbow Zamboni	317	73	23%	0.02	78	53	68%	6.0
Sand Art	450	75	17%	0.04	74	56	76%	6.9
String Stretching	810	126	16%	0.00	173	73	42%	8.7
Vending Machine	583	83	14%	0.02	144	73	51%	8.4
Zig Zag Nametag	908	368	41%	0.00	372	315	85%	3.7