Problems from 2021 ICPC North America Division Championships

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Alien Microwave 236 94 40% 0.00 123 90 73% 6.5
Another Substring Query Problem 785 143 18% 0.18 197 83 42% 8.3
Borders 346 85 25% 0.00 115 74 64% 7.4
Circle of Friends 163 50 31% 0.15 44 32 73% 6.8
Finding Polly 166 52 31% 0.66 22 16 73% 6.6
Investigating Imposters 465 175 38% 0.00 211 152 72% 6.0
Laptop Sticker 1434 931 65% 0.00 898 872 97% 1.4
Longest Common Substring 749 224 30% 0.00 249 189 76% 4.6
Simple Cron Spec 400 254 64% 0.01 255 238 93% 1.9
Surveillance 84 27 32% 0.00 22 16 73% 6.3
Train Line 176 32 18% 0.57 31 19 61% 8.5
Window Shopping 26 10 38% 0.10 14 9 64% 7.6
You Be the Judge! 1044 197 19% 0.00 255 179 70% 5.4