Problems from North American Invitational Programming Contest (NAIPC) 2017

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Apple Market	482	100	21%	0.07	125	63	50%	8.4
Blazing New Trails	1082	152	14%	0.18	165	84	51%	7.0
Heaps from Trees	390	125	32%	0.15	171	110	64%	6.7
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	1418	291	21%	0.01	338	230	68%	7.0
Ski Resort	115	10	9%	0.25	12	8	67%	6.1
Stars in a Can	328	102	31%	0.09	84	56	67%	6.8
Stretching Streamers	370	158	43%	0.03	170	131	77%	5.1
Unbalanced Parentheses	39	19	49%	0.02	15	10	67%	8.0
Yin and Yang Stones	2917	1850	63%	0.00	1674	1562	93%	1.7