Problems from North American Invitational Programming Contest (NAIPC) 2018

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Cut It Out!	208	82	39%	0.03	70	53	76%	5.9
Double Clique	434	120	28%	0.01	118	81	69%	8.0
Flashing Fluorescents	692	236	34%	0.00	173	138	80%	6.6
Missing Gnomes	3959	1442	36%	0.01	1057	922	87%	3.4
Prefix Free Code	2383	553	23%	0.04	355	251	71%	7.1
Probe Droids	413	81	20%	0.00	105	51	49%	9.1
Rainbow Graph	243	118	49%	0.01	71	54	76%	4.7
Recovery	1213	372	31%	0.00	258	212	82%	5.9
Red Black Tree	921	384	42%	0.04	192	166	86%	5.8
Winter Festival	48	19	40%	0.07	26	17	65%	6.8
Zoning Houses	1240	394	32%	0.09	273	199	73%	7.0