Problems from North American Invitational Programming Contest 2018

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Cut It Out! 92 50 54% 0.07 37 31 84% 3.3
Double Clique 233 60 26% 0.02 69 49 71% 5.0
Flashing Fluorescents 413 139 34% 0.00 117 90 77% 3.1
Missing Gnomes 1136 447 39% 0.01 380 333 88% 2.2
Prefix Free Code 1467 298 20% 0.04 257 161 63% 6.7
Probe Droids 245 48 20% 0.00 66 29 44% 6.2
Rainbow Graph 39 14 36% 0.01 17 10 59% 5.5
Recovery 647 192 30% 0.00 189 147 78% 4.7
Red Black Tree 503 186 37% 0.09 121 106 88% 3.0
Winter Festival 36 12 33% 0.07 20 11 55% 6.2
Zoning Houses 777 227 29% 0.09 198 135 68% 5.7