Round-robin tournament schedule: Difference between revisions
Add C# implementation
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Round 4: ( 1 vs 3 ) ( 5 vs 2 ) ( 6 vs 0 )
Round 5: ( 1 vs 2 ) ( 4 vs 0 ) ( 5 vs 6 )
</pre>
=={{header|C#}}==
{{trans|Java}}
<syntaxhighlight lang="C#">
using System;
using System.Collections.Generic;
using System.Linq;
public class RoundRobinTournamentSchedule
{
public static void Main(string[] args)
{
Console.WriteLine("Round robin for 12 players:");
RoundRobin(12);
Console.WriteLine("\n");
Console.WriteLine("Round robin for 5 players, 0 denotes a bye:");
RoundRobin(5);
}
private static void RoundRobin(int teamCount)
{
if (teamCount < 2)
{
throw new ArgumentException($"Number of teams must be greater than 2: {teamCount}");
}
List<int> rotatingList = Enumerable.Range(2, teamCount - 1).ToList();
if (teamCount % 2 == 1)
{
rotatingList.Add(0);
teamCount += 1;
}
for (int round = 1; round < teamCount; round++)
{
Console.Write($"Round {round,2}:");
List<int> fixedList = new List<int> { 1 };
fixedList.AddRange(rotatingList);
for (int i = 0; i < teamCount / 2; i++)
{
Console.Write($" ( {fixedList[i],2} vs {fixedList[teamCount - 1 - i],2} )");
}
Console.WriteLine();
Rotate(rotatingList, 1);
}
}
private static void Rotate(List<int> list, int rotationCount)
{
int count = list.Count;
if (count == 0) return;
rotationCount %= count;
if (rotationCount < 0)
{
rotationCount += count;
}
list.Reverse();
list.Reverse(0, rotationCount);
list.Reverse(rotationCount, count - rotationCount);
}
}
</syntaxhighlight>
{{out}}
<pre>
Round robin for 12 players:
Round 1: ( 1 vs 12 ) ( 2 vs 11 ) ( 3 vs 10 ) ( 4 vs 9 ) ( 5 vs 8 ) ( 6 vs 7 )
Round 2: ( 1 vs 11 ) ( 12 vs 10 ) ( 2 vs 9 ) ( 3 vs 8 ) ( 4 vs 7 ) ( 5 vs 6 )
Round 3: ( 1 vs 10 ) ( 11 vs 9 ) ( 12 vs 8 ) ( 2 vs 7 ) ( 3 vs 6 ) ( 4 vs 5 )
Round 4: ( 1 vs 9 ) ( 10 vs 8 ) ( 11 vs 7 ) ( 12 vs 6 ) ( 2 vs 5 ) ( 3 vs 4 )
Round 5: ( 1 vs 8 ) ( 9 vs 7 ) ( 10 vs 6 ) ( 11 vs 5 ) ( 12 vs 4 ) ( 2 vs 3 )
Round 6: ( 1 vs 7 ) ( 8 vs 6 ) ( 9 vs 5 ) ( 10 vs 4 ) ( 11 vs 3 ) ( 12 vs 2 )
Round 7: ( 1 vs 6 ) ( 7 vs 5 ) ( 8 vs 4 ) ( 9 vs 3 ) ( 10 vs 2 ) ( 11 vs 12 )
Round 8: ( 1 vs 5 ) ( 6 vs 4 ) ( 7 vs 3 ) ( 8 vs 2 ) ( 9 vs 12 ) ( 10 vs 11 )
Round 9: ( 1 vs 4 ) ( 5 vs 3 ) ( 6 vs 2 ) ( 7 vs 12 ) ( 8 vs 11 ) ( 9 vs 10 )
Round 10: ( 1 vs 3 ) ( 4 vs 2 ) ( 5 vs 12 ) ( 6 vs 11 ) ( 7 vs 10 ) ( 8 vs 9 )
Round 11: ( 1 vs 2 ) ( 3 vs 12 ) ( 4 vs 11 ) ( 5 vs 10 ) ( 6 vs 9 ) ( 7 vs 8 )
Round robin for 5 players, 0 denotes a bye:
Round 1: ( 1 vs 0 ) ( 2 vs 5 ) ( 3 vs 4 )
Round 2: ( 1 vs 5 ) ( 0 vs 4 ) ( 2 vs 3 )
Round 3: ( 1 vs 4 ) ( 5 vs 3 ) ( 0 vs 2 )
Round 4: ( 1 vs 3 ) ( 4 vs 2 ) ( 5 vs 0 )
Round 5: ( 1 vs 2 ) ( 3 vs 0 ) ( 4 vs 5 )
</pre>
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