4th Polish Olympiad in Informatics

Tasks

The Number of Symmetrical Choices (Stage I)  
Jumps (Stage I)  
Cheap Travels (Stage I)  
XOR Gates (Stage I)  
Airports (Stage II - day 0)  
Addon (Stage II - day 1)  
Genotypes (Stage II - day 1)  
Petrol (Stage II - day 2)  
Recursive Ant (Stage II - day 2)  
Credibility of Witnesses (Stage III - day 0)  
Canoes (Stage III - day 1)  
The Number of N-k-special Sets (Stage III - day 1)  
Monochromatic Triangles (Stage III - day 1)  
Ali Baba (Stage III - day 2)  
Lecture Halls Reservation (Stage III - day 2)