Problems from North American Invitational Programming Contest 2015

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Area of Effect 78 8 10% 4.74 13 6 46% 7.9
Canyon Mapping 64 8 12% 0.85 6 4 67% 6.5
Extensive Or 40 22 55% 0.17 20 19 95% 4.4
Magic Checkerboard 748 114 15% 0.18 158 100 63% 7.2
Primal Partitions 464 130 28% 0.01 117 91 78% 5.8
Rainbow Zamboni 263 51 19% 0.04 62 40 65% 6.6
Sand Art 319 55 17% 0.07 51 41 80% 6.1
String Stretching 598 85 14% 0.01 118 49 42% 8.6
Vending Machine 391 51 13% 0.03 102 48 47% 8.6
Zig Zag Nametag 540 214 40% 0.00 225 196 87% 3.4