Round-robin tournament schedule: Difference between revisions
Add Ruby
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:* '''[[wp:Round-robin tournament|Wikipedia - Round-robin tournament]]'''
<br>
=={{header|Ruby}}==
<lang ruby>def round_robin( n )
rotating_players = (2..n).map(&:to_s) #player 1 to be added later
rotating_players << "bye" if n.odd?
Array.new(rotating_players.size) do |r|
all = ["1"] + rotating_players.rotate(-r)
[all[0, all.size/2], all[all.size/2..].reverse]
end
end
round_robin(12).each.with_index(1) do |round, i|
puts "Round #{i}"
round.each do |players|
puts players.map{|player| player.ljust(4)}.join
end
puts
end
</lang>
{{out}}
<pre>Round 1
1 2 3 4 5 6
12 11 10 9 8 7
Round 2
1 12 2 3 4 5
11 10 9 8 7 6
Round 3
1 11 12 2 3 4
10 9 8 7 6 5
Round 4
1 10 11 12 2 3
9 8 7 6 5 4
Round 5
1 9 10 11 12 2
8 7 6 5 4 3
Round 6
1 8 9 10 11 12
7 6 5 4 3 2
Round 7
1 7 8 9 10 11
6 5 4 3 2 12
Round 8
1 6 7 8 9 10
5 4 3 2 12 11
Round 9
1 5 6 7 8 9
4 3 2 12 11 10
Round 10
1 4 5 6 7 8
3 2 12 11 10 9
Round 11
1 3 4 5 6 7
2 12 11 10 9 8
</pre>
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