Problems from North American Invitational Programming Contest (NAIPC) 2018

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Cut It Out!	112	57	51%	0.03	45	35	78%	4.4
Double Clique	301	75	25%	0.01	86	58	67%	7.8
Flashing Fluorescents	509	178	35%	0.00	138	108	78%	3.9
Missing Gnomes	1651	648	39%	0.01	477	423	89%	2.3
Prefix Free Code	1699	355	21%	0.04	275	180	65%	6.5
Probe Droids	293	58	20%	0.00	74	36	49%	6.6
Rainbow Graph	49	18	37%	0.01	24	14	58%	5.4
Recovery	782	243	31%	0.00	213	170	80%	4.6
Red Black Tree	605	227	38%	0.09	140	120	86%	3.9
Winter Festival	37	13	35%	0.07	21	12	57%	6.1
Zoning Houses	934	275	29%	0.09	216	151	70%	5.7