Insert Interval LeetCode

Check the comments

public List<Interval> insert(List<Interval> intervals, Interval newInterval) {
        List<Interval> res = new ArrayList<Interval>();
       
        int i=0;
        //Add all the interval before the overlapping
        for (; i<intervals.size() && newInterval.start > intervals.get(i).end; i++) {
            res.add(intervals.get(i));
        }
       
        //Add the overlapping interval (Find the last overlapping interval)
        for (; i<intervals.size() && intervals.get(i).start<= newInterval.end; i++) {
            newInterval.start = Math.min(newInterval.start, intervals.get(i).start);
            newInterval.end = Math.max(newInterval.end, intervals.get(i).end);
        }
        res.add(newInterval);
        //Add all the interval after the overlapping
        for (; i<intervals.size(); i++) {
            res.add(intervals.get(i));
        }
        return res;
    }