Problems from North American Invitational Programming Contest (NAIPC) 2018

	Submissions				Users
Name	Total	Acc.	Ratio	Fastest	Total	Acc.	Ratio	Difficulty
Cut It Out!	123	58	47%	0.03	48	36	75%	5.3
Double Clique	316	81	26%	0.01	90	61	68%	8.3
Flashing Fluorescents	549	186	34%	0.00	147	112	76%	6.5
Missing Gnomes	1968	763	39%	0.01	527	465	88%	2.5
Prefix Free Code	1829	387	21%	0.04	288	192	67%	7.0
Probe Droids	310	64	21%	0.00	77	39	51%	7.9
Rainbow Graph	82	37	45%	0.01	33	20	61%	4.5
Recovery	954	275	29%	0.00	224	180	80%	5.5
Red Black Tree	715	285	40%	0.04	152	129	85%	5.2
Winter Festival	44	16	36%	0.07	23	14	61%	6.7
Zoning Houses	1010	298	30%	0.09	228	158	69%	6.7