Vampire number: Difference between revisions

=={{header|Swift}}==

<lang swift>import Foundation

func vampire<T>(n: T) -> [(T, T)] where T: BinaryInteger, T.Stride: SignedInteger {

let strN = String(n).sorted()

let fangLength = strN.count / 2

let start = T(pow(10, Double(fangLength - 1)))

let end = T(Double(n).squareRoot())

var fangs = [(T, T)]()

for i in start...end where n % i == 0 {

let quot = n / i

guard i % 10 != 0 || quot % 10 != 0 else {

continue

}

if "\(i)\(quot)".sorted() == strN {

fangs.append((i, quot))

}

}

return fangs

}

var count = 0

var i = 1.0

while count < 25 {

let start = Int(pow(10, i))

let end = start * 10

for num in start...end {

let fangs = vampire(n: num)

guard !fangs.isEmpty else { continue }

count += 1

print("\(num) is a vampire number with fangs: \(fangs)")

guard count != 25 else { break }

}

i += 2

}

for (vamp, fangs) in [16758243290880, 24959017348650, 14593825548650].lazy.map({ ($0, vampire(n: $0)) }) {

if fangs.isEmpty {

print("\(vamp) is not a vampire number")

} else {

print("\(vamp) is a vampire number with fangs: \(fangs)")

}

}</lang>

{{out}}

<pre>1260 is a vampire number with fangs: [(21, 60)]

1395 is a vampire number with fangs: [(15, 93)]

1435 is a vampire number with fangs: [(35, 41)]

1530 is a vampire number with fangs: [(30, 51)]

1827 is a vampire number with fangs: [(21, 87)]

2187 is a vampire number with fangs: [(27, 81)]

6880 is a vampire number with fangs: [(80, 86)]

102510 is a vampire number with fangs: [(201, 510)]

104260 is a vampire number with fangs: [(260, 401)]

105210 is a vampire number with fangs: [(210, 501)]

105264 is a vampire number with fangs: [(204, 516)]

105750 is a vampire number with fangs: [(150, 705)]

108135 is a vampire number with fangs: [(135, 801)]

110758 is a vampire number with fangs: [(158, 701)]

115672 is a vampire number with fangs: [(152, 761)]

116725 is a vampire number with fangs: [(161, 725)]

117067 is a vampire number with fangs: [(167, 701)]

118440 is a vampire number with fangs: [(141, 840)]

120600 is a vampire number with fangs: [(201, 600)]

123354 is a vampire number with fangs: [(231, 534)]

124483 is a vampire number with fangs: [(281, 443)]

125248 is a vampire number with fangs: [(152, 824)]

125433 is a vampire number with fangs: [(231, 543)]

125460 is a vampire number with fangs: [(204, 615), (246, 510)]

125500 is a vampire number with fangs: [(251, 500)]

16758243290880 is a vampire number with fangs: [(1982736, 8452080), (2123856, 7890480), (2751840, 6089832), (2817360, 5948208)]

24959017348650 is a vampire number with fangs: [(2947050, 8469153), (2949705, 8461530), (4125870, 6049395), (4129587, 6043950), (4230765, 5899410)]

14593825548650 is not a vampire number</pre>