Problems from 2021 ICPC North America Division Championships

Name Fastest Shortest Total Acc. Ratio Difficulty Languages
Alien Microwave 0.00 317 283 108 38% 7.2Hard en
Another Substring Query Problem 0.18 1288 1131 236 21% 8.3Hard en
Borders 0.00 1782 420 116 28% 7.1Hard en
Circle of Friends 0.15 1079 309 69 22% 6.7Hard en
Finding Polly 0.48 3029 190 57 30% 8.2Hard en
Investigating Imposters 0.00 358 738 236 32% 6.4Hard en
Laptop Sticker 0.00 47 4440 2663 60% 1.5Easy en
Longest Common Substring 0.00 246 1113 328 29% 5.3Medium en
Simple Cron Spec 0.00 405 734 438 60% 2.1Easy en
Surveillance 0.00 957 150 39 26% 8.0Hard en
Train Line 0.57 1466 269 54 20% 8.7Hard en
Window Shopping 0.10 3342 36 11 31% 8.5Hard en
You Be the Judge! 0.00 425 1665 330 20% 5.8Hard en