Round-robin tournament schedule: Difference between revisions
Add Swift implementation
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Round 4: ( 1 vs 3 ) ( 4 vs 2 ) ( 5 vs 0 )
Round 5: ( 1 vs 2 ) ( 3 vs 0 ) ( 4 vs 5 )
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=={{header|Swift}}==
{{trans|Java}}
<syntaxhighlight lang="Swift">
import Foundation
func roundRobin(teamCount: Int) {
if teamCount < 2 {
fatalError("Number of teams must be greater than 2: \(teamCount)")
}
var rotatingList = Array(2...teamCount)
var effectiveTeamCount = teamCount
if teamCount % 2 == 1 {
rotatingList.append(0) // Adding a 'bye' in case of odd number of teams
effectiveTeamCount += 1
}
for round in 1..<effectiveTeamCount {
print("Round \(round):", terminator: "")
let fixedList = [1] + rotatingList
for i in 0..<(effectiveTeamCount / 2) {
print(" (\(fixedList[i]) vs \(fixedList[effectiveTeamCount - 1 - i]))", terminator: "")
}
print()
rotatingList.rotate(shift: 1)
}
}
extension Array {
mutating func rotate(shift: Int) {
let index = shift >= 0 ?
self.index(self.startIndex, offsetBy: self.count - shift, limitedBy: self.endIndex) :
self.index(self.startIndex, offsetBy: -shift, limitedBy: self.endIndex)
guard let validIndex = index else { return }
self = Array(self[validIndex..<self.endIndex] + self[self.startIndex..<validIndex])
}
}
// Example usage
print("Round robin for 12 players:")
roundRobin(teamCount: 12)
print("\nRound robin for 5 players, 0 denotes a bye:")
roundRobin(teamCount: 5)
</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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