ข้อสอบ Round 1
olympiad.org.uk
British Informatics Olympiad 2011 - air
British Informatics Olympiad 2011 - earth
British Informatics Olympiad 2011 - feature
British Informatics Olympiad 2011 - fire
British Informatics Olympiad 2011 - interleaving
British Informatics Olympiad 2011 - water
เฉลยคำตอบ Round 1
