Problems from 2020 ICPC North America Regionals (March 6 2021)

Name Fastest Total Acc. Ratio Difficulty
Ant Typing 0.02 620 177 29% 6.0hard
Bad Packing 0.00 642 126 20% 7.9hard
Basic Basis 0.01 163 35 21% 7.4hard
Bitonic Ordering 0.04 392 100 26% 6.9hard
Condorcet 0.00 92 25 27% 8.7hard
Derangement Rotations 0.00 67 38 57% 6.6hard
Dominating Duos 0.03 599 132 22% 7.7hard
Exam Manipulation 0.00 961 312 32% 5.5hard
Exciting Tournament 0.01 76 40 53% 7.1hard
Kth Subtree 0.06 439 91 21% 7.2hard
Longest Common Subsequence 0.00 568 254 45% 5.2medium
Magic Trick 0.00 3736 2573 69% 1.4easy
Missing Number 0.00 1469 540 37% 3.4medium
No Thanks! 0.00 1217 707 58% 2.1easy
Painted Corridors 0.01 154 55 36% 7.8hard
Rainbow Numbers 0.00 357 92 26% 7.0hard
Rating Problems 0.00 5626 3470 62% 1.4easy
Smoothie Stand 0.00 493 300 61% 2.7easy
Triangular Collection 0.00 349 145 42% 6.2hard
TripTik 0.80 244 66 27% 7.1hard
Unread Messages 0.00 1233 353 29% 4.8medium