50 lines
996 B
Swift
50 lines
996 B
Swift
import Darwin
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func ranges(from ints:[Int]) -> [(Int, Int)] {
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var range : (Int, Int)?
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var ranges = [(Int, Int)]()
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for this in ints {
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if let (start, end) = range {
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if this == end + 1 {
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range = (start, this)
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}
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else {
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ranges.append(range!)
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range = (this, this)
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}
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}
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else { range = (this, this) }
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}
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ranges.append(range!)
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return ranges
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}
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func description(from ranges:[(Int, Int)]) -> String {
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var desc = ""
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for (start, end) in ranges {
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desc += desc.isEmpty ? "" : ","
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if start == end {
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desc += "\(start)"
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}
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else if end == start + 1 {
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desc += "\(start),\(end)"
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}
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else {
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desc += "\(start)-\(end)"
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}
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}
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return desc
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}
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let ex = [-6, -3, -2, -1, 0, 1, 3, 4, 5, 7, 8, 9, 10, 11, 14, 15, 17, 18, 19, 20]
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let longer = [0, 1, 2, 4, 6, 7, 8, 11, 12, 14,
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15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
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25, 27, 28, 29, 30, 31, 32, 33, 35, 36,
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37, 38, 39]
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print(description(from: ranges(from: ex)))
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print(description(from: ranges(from: longer)))
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