18 lines
510 B
Swift
18 lines
510 B
Swift
func isGapful(n: Int) -> Bool {
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guard n > 100 else {
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return true
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}
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let asString = String(n)
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let div = Int("\(asString.first!)\(asString.last!)")!
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return n % div == 0
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}
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let first30 = (100...).lazy.filter(isGapful).prefix(30)
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let mil = (1_000_000...).lazy.filter(isGapful).prefix(15)
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let bil = (1_000_000_000...).lazy.filter(isGapful).prefix(15)
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print("First 30 gapful numbers: \(Array(first30))")
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print("First 15 >= 1,000,000: \(Array(mil))")
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print("First 15 >= 1,000,000,000: \(Array(bil))")
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