Problems from North American Invitational Programming Contest (NAIPC) 2015

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Area of Effect 201 16 8% 1.38 40 14 35% 8.6
Canyon Mapping 111 20 18% 0.06 16 12 75% 7.3
Extensive Or 129 77 60% 0.00 57 52 91% 3.5
Magic Checkerboard 2851 505 18% 0.07 400 259 65% 7.1
Primal Partitions 807 271 34% 0.01 233 190 82% 5.5
Rainbow Zamboni 522 127 24% 0.02 117 78 67% 6.7
Sand Art 656 117 18% 0.04 104 79 76% 6.3
String Stretching 1180 210 18% 0.00 242 107 44% 8.8
Vending Machine 704 107 15% 0.02 176 95 54% 8.3
Zig Zag Nametag 1239 506 41% 0.00 505 425 84% 3.9