Problems from North American Invitational Programming Contest (NAIPC) 2015

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Area of Effect	157	11	7%	1.93	23	9	39%	8.5
Canyon Mapping	80	11	14%	0.08	11	7	64%	7.8
Extensive Or	67	34	51%	0.00	32	27	84%	5.5
Magic Checkerboard	1124	172	15%	0.07	231	147	64%	7.4
Primal Partitions	629	198	31%	0.01	167	130	78%	5.5
Rainbow Zamboni	315	72	23%	0.03	77	52	68%	6.0
Sand Art	407	68	17%	0.04	70	53	76%	6.3
String Stretching	795	116	15%	0.00	170	72	42%	8.7
Vending Machine	577	82	14%	0.02	143	72	50%	8.4
Zig Zag Nametag	875	354	40%	0.00	359	305	85%	3.6