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Oracle phone
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| ArrayList<Interval> getFreeList(long start, long end, ArrayList<ArrayList<Interval>> busyLists) { | |
| ArrayList<Interval> result = new ArrayList<>(); | |
| if (start >= end) return result; | |
| if (busyLists.size() == 0) { | |
| result.add(new Interval(start, end)); | |
| return result; | |
| } | |
| ArrayList<Interval> globalList = new ArrayList<>(); | |
| for (ArrayList<Interval> list : busyLists) globalList.addAll(list); | |
| if (globalList.size() == 0) { | |
| result.add(new Interval(start, end)); | |
| return result; | |
| } | |
| Collections.sort(globalList, new IntervalComparator()); | |
| long latestSoFar = start; | |
| for (int i = 0; i < globalList.size(); ++i) { | |
| if (latestSoFar >= end) return result; | |
| Interval current = globalList.get(i); | |
| if (current.start >= end) return result; | |
| if (current.start > latestSoFar) { | |
| result.add(new Interval(latestSoFar, Math.min(current.start, end))); | |
| } | |
| latestSoFar = Math.max(latestSoFar, current.end); | |
| } | |
| if (latestSoFar < end) result.add(new Interval(latestSoFar, end)); | |
| return result; | |
| } | |
| class IntervalComparator implements Comparator<Interval> { | |
| @Override | |
| public int compare(Interval i1, Interval i2) { | |
| return i1.start == i2.start ? Long.compare(i1.end, i2.end) : Long.compare(i1.start, i2.start); | |
| } | |
| } |
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