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

Languages
Ant Typing0.0131574822530%6.1Harden
Bad Packing0.0039176916021%7.8Harden
Basic Basis0.007602174722%6.5Harden
Bitonic Ordering0.0440743511827%7.2Harden
Condorcet0.00708982728%8.6Harden
Derangement Rotations0.001021015251%5.7Harden
Dominating Duos0.037670918927%7.4Harden
Exam Manipulation0.00119120145538%4.6Mediumen
Exciting Tournament0.012153804556%6.8Harden
Kth Subtree0.0667061812120%6.7Harden
Longest Common Subsequence0.0029358728048%5.2Mediumen
Magic Trick0.00136816423062%1.5Easyen
Missing Number0.0058197369435%3.4Mediumen
No Thanks!0.00662067114255%2.0Easyen
Painted Corridors0.0114911665835%8.3Harden
Rainbow Numbers0.0026143711727%6.9Harden
Rating Problems0.00518457487758%1.4Easyen
Smoothie Stand0.008979041753%2.6Easyen
Triangular Collection0.008741217943%6.0Harden
TripTik0.8018082586927%7.1Harden
Unread Messages0.0058148550034%4.2Mediumen