Problems from North American Invitational Programming Contest (NAIPC) 2015

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Area of Effect	172	15	9%	1.38	31	13	42%	8.2
Canyon Mapping	108	18	17%	0.06	15	11	73%	7.3
Extensive Or	123	75	61%	0.00	55	50	91%	3.5
Magic Checkerboard	2783	489	18%	0.07	383	251	66%	7.0
Primal Partitions	791	261	33%	0.01	225	183	81%	5.4
Rainbow Zamboni	506	122	24%	0.02	111	76	68%	6.4
Sand Art	613	111	18%	0.04	98	77	79%	6.1
String Stretching	1111	200	18%	0.00	234	104	44%	8.7
Vending Machine	683	103	15%	0.02	168	91	54%	8.2
Zig Zag Nametag	1164	480	41%	0.00	482	407	84%	3.9