Problems from North American Invitational Programming Contest (NAIPC) 2015

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Area of Effect	170	14	8%	1.38	29	12	41%	8.3
Canyon Mapping	84	13	15%	0.08	13	9	69%	7.6
Extensive Or	77	40	52%	0.00	38	33	87%	5.0
Magic Checkerboard	2200	377	17%	0.07	308	195	63%	7.0
Primal Partitions	699	224	32%	0.01	193	153	79%	5.4
Rainbow Zamboni	370	92	25%	0.02	84	58	69%	5.9
Sand Art	460	78	17%	0.04	78	59	76%	7.3
String Stretching	874	144	16%	0.00	195	83	43%	8.7
Vending Machine	637	92	14%	0.02	154	80	52%	8.2
Zig Zag Nametag	991	402	41%	0.00	406	344	85%	3.7