/**

* Definition for an interval.

* public class Interval {

* int start;

* int end;

* Interval() { start = 0; end = 0; }

* Interval(int s, int e) { start = s; end = e; }

* }

*/

class Solution {

public List<Interval> insert(List<Interval> intervals, Interval newInterval) {

if(newInterval == null) return intervals;

List<Interval> result = new ArrayList<>();

boolean flag = false;

for(Interval it : intervals) {

if(it.end < newInterval.start){

result.add(it);

} else if (it.start > newInterval.end) {

if(flag == false) {

result.add(newInterval);

flag = true;

}

result.add(it);

} else {

newInterval = new Interval(Math.min(newInterval.start, it.start),

Math.max(newInterval.end, it.end));

}

}

if(flag == false) result.add(newInterval);

return result;

}

}