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 68 8 12% 0.85 7 4 57% 6.8
Extensive Or 42 23 55% 0.17 21 20 95% 4.4
Magic Checkerboard 871 132 15% 0.10 181 114 63% 7.1
Primal Partitions 535 146 27% 0.01 131 104 79% 5.1
Rainbow Zamboni 280 56 20% 0.04 66 43 65% 6.3
Sand Art 331 56 17% 0.07 53 42 79% 5.9
String Stretching 619 86 14% 0.01 128 50 39% 8.7
Vending Machine 431 54 13% 0.03 111 51 46% 8.6
Zig Zag Nametag 601 234 39% 0.00 247 214 87% 3.3