Problems from 2021 ICPC North America Division Championships

Submissions Users
Name   Total Acc. Ratio Fastest Total Acc. Ratio Difficulty
Alien Microwave 243 98 40% 0.00 127 94 74% 6.5
Another Substring Query Problem 830 168 20% 0.18 207 92 44% 8.2
Borders 370 95 26% 0.00 127 82 65% 7.4
Circle of Friends 167 52 31% 0.15 46 34 74% 6.4
Finding Polly 166 52 31% 0.66 22 16 73% 6.7
Investigating Imposters 683 218 32% 0.00 244 170 70% 6.4
Laptop Sticker 2281 1406 62% 0.00 1326 1282 97% 1.4
Longest Common Substring 879 277 32% 0.00 278 211 76% 4.8
Simple Cron Spec 528 318 60% 0.00 299 271 91% 2.0
Surveillance 94 29 31% 0.00 24 18 75% 6.4
Train Line 210 34 16% 0.57 35 21 60% 8.7
Window Shopping 26 10 38% 0.10 14 9 64% 7.6
You Be the Judge! 1211 246 20% 0.00 288 201 70% 5.8