Planning a competition

Posted by Jérôme on Stack Overflow See other posts from Stack Overflow or by Jérôme
Published on 2010-05-31T07:07:53Z Indexed on 2010/05/31 7:12 UTC
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I need to produce the schedule of a sport-event.

There are 30 teams. Each team has to play 8 matches. This means that it is not possible for each team to compete again all other teams, but I need to avoid that two team compete more than once against each other.

My idea was to generate all possible matches (for 30 teams: (30*29)/2 = 435 matches) and select from this list 120 matches (8 match for each team: 8 * 30 / 2 = 120 matches).

This is where I'm having a hard time: how can I select these 120 matches? I tried some simple solutions (take first match of the list, then the last, and so on) but they don't seem to work with 30 teams. I also tried to generate all possible match combination and find which one is working but with 30 team, this is too much calculation time.

Is there an existing algorithm that I could implement?

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