Problems from North American Invitational Programming Contest (NAIPC) 2015

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Area of Effect	201	16	8%	1.38	40	14	35%	8.6
Canyon Mapping	111	20	18%	0.06	16	12	75%	7.3
Extensive Or	129	77	60%	0.00	57	52	91%	3.5
Magic Checkerboard	2851	505	18%	0.07	400	259	65%	7.1
Primal Partitions	807	271	34%	0.01	233	190	82%	5.5
Rainbow Zamboni	522	127	24%	0.02	117	78	67%	6.7
Sand Art	656	117	18%	0.04	104	79	76%	6.3
String Stretching	1180	210	18%	0.00	242	107	44%	8.8
Vending Machine	704	107	15%	0.02	176	95	54%	8.3
Zig Zag Nametag	1239	506	41%	0.00	505	425	84%	3.9