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| // assumes intervals to be sorted on Start then End | |
| highWaterMark := epoch | |
| sum := 0 | |
| for interval := intervals | |
| if interval.End.Before(highWaterMark) continue | |
| sum += between( | |
| max(highWaterMark, interval.Start), | |
| max(highWaterMark, interval.End) | |
| ) | |
| highWaterMark = interval.End | |
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