Problems from North American Invitational Programming Contest (NAIPC) 2017

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Apple Market	518	116	22%	0.07	136	70	51%	8.8
Blazing New Trails	1514	233	15%	0.18	202	113	56%	7.4
Heaps from Trees	447	144	32%	0.15	187	121	65%	7.1
Incremental Double Free Strings	49	21	43%	0.01	22	16	73%	5.6
Maximum Color Clique	117	41	35%	0.04	42	31	74%	6.1
Pieces of Parentheses	1553	318	20%	0.01	364	249	68%	7.1
Ski Resort	117	11	9%	0.25	14	9	64%	6.2
Stars in a Can	363	119	33%	0.09	99	68	69%	6.5
Stretching Streamers	390	170	44%	0.03	181	142	78%	5.1
Unbalanced Parentheses	41	20	49%	0.02	17	11	65%	8.0
Yin and Yang Stones	3600	2289	64%	0.00	2090	1960	94%	1.7