Problems from North American Invitational Programming Contest (NAIPC) 2018

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Cut It Out!	162	70	43%	0.03	59	43	73%	6.2
Double Clique	382	100	26%	0.01	104	71	68%	6.2
Flashing Fluorescents	661	223	34%	0.00	159	126	79%	5.1
Missing Gnomes	2901	1083	37%	0.01	713	640	90%	2.6
Prefix Free Code	2199	500	23%	0.04	317	219	69%	6.7
Probe Droids	372	74	20%	0.00	91	47	52%	6.9
Rainbow Graph	101	48	48%	0.01	40	27	68%	4.2
Recovery	1154	349	30%	0.00	236	192	81%	5.3
Red Black Tree	836	351	42%	0.04	163	142	87%	4.6
Winter Festival	47	18	38%	0.07	25	16	64%	6.7
Zoning Houses	1154	356	31%	0.09	245	175	71%	6.3