Problems from University of Alberta Programming Contest 2023

Languages
Adding Trouble0.00134257231354%1.3Easyen
Alien Math0.006739719750%2.9Mediumen
Card Counting Club1.0255422510145%4.4Mediumen
Central String0.034411582214%8.4Harden
Graduation Table0.005211206252%6.1Harden
International Dates0.0045143885459%1.5Easyen
Lefties vs. Righties0.002172037939%6.2Harden
Maddison's Square Garden0.251118952526%8.2Harden
Mean Words0.008042230873%1.8Easyen
Mirror Strings0.009217911263%3.9Mediumen
Precarious Stacks0.11478923740%6.3Harden
Shopping Bags0.005201994422%7.8Harden
Sneaky Exploration0.048811213226%7.5Harden
Sticky Keys0.008127482465%1.5Easyen