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 801 124 15% 0.10 166 106 64% 7.0
Primal Partitions 494 141 29% 0.01 125 99 79% 5.1
Rainbow Zamboni 275 55 20% 0.04 64 42 66% 6.3
Sand Art 322 56 17% 0.07 51 42 82% 5.9
String Stretching 612 86 14% 0.01 124 50 40% 8.6
Vending Machine 412 52 13% 0.03 107 49 46% 8.7
Zig Zag Nametag 558 221 40% 0.00 232 202 87% 3.4