Problems from North American Invitational Programming Contest (NAIPC) 2017

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Apple Market	477	99	21%	0.07	122	62	51%	8.2
Blazing New Trails	1066	149	14%	0.18	164	83	51%	6.9
Heaps from Trees	383	123	32%	0.15	168	108	64%	6.8
Incremental Double Free Strings	48	20	42%	0.01	21	15	71%	6.2
Maximum Color Clique	109	34	31%	0.04	39	29	74%	5.8
Pieces of Parentheses	1391	283	20%	0.01	332	225	68%	7.0
Ski Resort	115	10	9%	0.25	12	8	67%	6.1
Stars in a Can	302	101	33%	0.09	81	55	68%	6.1
Stretching Streamers	370	158	43%	0.03	170	131	77%	5.1
Unbalanced Parentheses	38	19	50%	0.02	14	10	71%	7.5
Yin and Yang Stones	2718	1725	63%	0.00	1555	1452	93%	1.7