I have a two ranges that represents a timeline of ...

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[KamilH]

I have a two ranges that represents a timeline of some media (whole media is 0..30000, but I have a ranges like 0..15000 and 15001..30000). I also have a list of ranges how long user listened to some part of the media. Is there any function in stdlib that lets me easily calculate how long user spent in which range?
Media ranges (0..30_000):
0..15_000 and 15_001..30_000

Listened ranges:
(0..10_000), (5_000..15_000), (20_000..25_000)

Result would be:
For (0..15_000) range = 20_000
For (15_001..30_000) range = 5_000

[KamilH]

This is what I came up with

private fun LongRange.countIfPresentInRanges(ranges: List<LongRange>): Long {
    var sum = 0L
    forEach { value ->
        ranges.forEach {
            if (it.contains(value)) {
                sum++
            }
        }
    }
    return sum
}