8th Polish Olympiad in Informatics

Tasks

Antiprime Numbers (Stage I)  
Green Game (Stage I)  
Density Map (Stage I)  
Intervals (Stage I)  
Weaker Goldbach (Stage II - day 0)  
Peaceful Comission (Stage II - day 1)  
Island (Stage II - day 1)  
Ants and the Ladybug (Stage II - day 2)  
Travel (Stage II - day 2)  
Wandering Flea Trainers (Stage III - day 0)  
Necklaces (Stage III - day 1)  
City Tour (Stage III - day 1)  
Bank (Stage III - day 2)  
Goldmine (Stage III - day 2)  
Chain (Stage III - day 2)