11 lines
332 B
Swift
11 lines
332 B
Swift
func isLongYear(_ year: Int) -> Bool {
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let year1 = year - 1
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let p = (year + (year / 4) - (year / 100) + (year / 400)) % 7
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let p1 = (year1 + (year1 / 4) - (year1 / 100) + (year1 / 400)) % 7
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return p == 4 || p1 == 3
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}
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for range in [1900...1999, 2000...2099, 2100...2199] {
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print("\(range): \(range.filter(isLongYear))")
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}
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