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public class InsertInterval {
public List<Interval> insert(List<Interval> intervals, Interval newInterval) {
List<Interval> result = new ArrayList<Interval>();
if (intervals == null || intervals.isEmpty() || (newInterval.start <= intervals.get(0).start
&& newInterval.end >= intervals.get(intervals.size() - 1).end)) {
if (newInterval != null) {
result.add(newInterval);
}
return result;
}
if (newInterval.start == intervals.get(intervals.size() - 1).end) {
intervals.get(intervals.size() - 1).end = newInterval.end;
return intervals;
}
if (newInterval.end == intervals.get(0).start) {
intervals.get(0).start = newInterval.start;
return intervals;
}
if (newInterval.start > intervals.get(intervals.size() - 1).end) {
intervals.add(newInterval);
return intervals;
}
if (newInterval.end < intervals.get(0).start) {
intervals.add(0, newInterval);
return intervals;
}
int start = Integer.MIN_VALUE;
int end = Integer.MIN_VALUE;
for (int i = 0; i < intervals.size(); i++) {
Interval tmp = intervals.get(i);
if (tmp.start <= newInterval.start && tmp.end >= newInterval.start) {
start = i;
}
if (tmp.start <= newInterval.end && tmp.end >= newInterval.end) {
end = i;
}
if (start == Integer.MIN_VALUE && newInterval.start < tmp.start) {
start = -i;
}
if (end == Integer.MIN_VALUE && newInterval.end < tmp.start) {
end = -i;
}
}
if (end == Integer.MIN_VALUE && intervals.get(intervals.size() - 1).end < newInterval.end) {
intervals.get(intervals.size() - 1).end = newInterval.end;
}
if (start < 0 && end == start) {
intervals.add(-start, newInterval);
return intervals;
}
if (start <= 0 && intervals.get(-start).start > newInterval.start) {
intervals.get(-start).start = newInterval.start;
}
intervals.get(Math.abs(start)).end = (end < 0) ? newInterval.end : intervals.get(end).end;
start = Math.abs(start);
end = end < 0 ? -end - 1 : end;
for (int i = 0; i < intervals.size(); i++) {
if (i <= start || i > end) {
result.add(intervals.get(i));
}
}
return result;
}
@Test
public void test() {
List<Interval> intervals = new ArrayList<Interval>();
intervals.add(new Interval(1, 5));
Interval newInterval = new Interval(2, 3);
List<Interval> result = insert(intervals, newInterval);
}
}
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