Problems from 2021 ICPC North America Division Championships

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Alien Microwave 295 112 38% 0.00 147 105 71% 6.7
Another Substring Query Problem 1141 228 20% 0.18 250 112 45% 8.4
Borders 433 114 26% 0.00 150 97 65% 7.2
Circle of Friends 261 70 27% 0.15 63 46 73% 6.7
Finding Polly 247 58 23% 0.48 39 22 56% 8.1
Investigating Imposters 904 277 31% 0.00 270 189 70% 6.5
Laptop Sticker 3414 2142 63% 0.00 2007 1936 96% 1.4
Longest Common Substring 1273 377 30% 0.00 335 251 75% 5.2
Simple Cron Spec 757 434 57% 0.00 367 340 93% 2.0
Surveillance 155 41 26% 0.00 37 25 68% 7.3
Train Line 241 42 17% 0.57 43 24 56% 8.8
Window Shopping 28 11 39% 0.10 16 10 62% 7.7
You Be the Judge! 1821 367 20% 0.00 359 261 73% 5.7