Competition Format
The Australian Informatics Olympiad is a 3 problem competition held on the internet over 3 hours. Competitors are allowed to begin the competition at any time within a specified period but once started, must complete the three hours in a single block. In the first competition in 1998, competitors had to solve 3 problems in 3 hours. This was changed to 4 problems in 4 hours from 1999 to 2009, but was then changed again, back to 3 problems in 3 hours for the 2010 and 2011 competitions.
Competitors must solve AIO problems by taking input from a specified input file and writing output to a specified output file. Input files could have any input within specified bounds and in a certain format. Contestants must then output the corresponding answer in a specified format to the output file. Sample data and output are supplied in the problem statements for each problem but judges will use secret test data which is often more strenuous than the sample data to test solutions.
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