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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Evaluate-binomial-coefficients/Swift/evaluate-binomial-coefficients.swift Normal file
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func factorial<T: BinaryInteger>(_ n: T) -> T {
guard n != 0 else {
return 1
}
return stride(from: n, to: 0, by: -1).reduce(1, *)
}
func binomial<T: BinaryInteger>(_ x: (n: T, k: T)) -> T {
let nFac = factorial(x.n)
let kFac = factorial(x.k)
return nFac / (factorial(x.n - x.k) * kFac)
}
print("binomial(\(5), \(3)) = \(binomial((5, 3)))")
print("binomial(\(20), \(11)) = \(binomial((20, 11)))")