Problems from North American Invitational Programming Contest (NAIPC) 2017

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Apple Market	474	99	21%	0.07	121	62	51%	8.2
Blazing New Trails	824	101	12%	0.18	154	71	46%	8.2
Heaps from Trees	381	123	32%	0.15	166	108	65%	6.5
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	1389	282	20%	0.01	330	224	68%	7.0
Ski Resort	115	10	9%	0.25	12	8	67%	6.1
Stars in a Can	301	101	34%	0.09	80	55	69%	5.8
Stretching Streamers	366	158	43%	0.03	169	131	78%	5.0
Unbalanced Parentheses	38	19	50%	0.02	14	10	71%	7.5
Yin and Yang Stones	2635	1662	63%	0.00	1497	1395	93%	1.7