57. Insert Interval
if (newInterval == null || intervals == null) {
return intervals;
}
List<Interval> result = new ArrayList<Interval>();
int index = 0;
//分三种循环其实是四种情况,else是两种情况
for(Interval interval : intervals){
if(interval.end < newInterval.start){
result.add(interval);
index++;
}
else if(interval.start > newInterval.end){
result.add(interval);
}
else{
newInterval.start = Math.min(interval.start,newInterval.start);
newInterval.end = Math.max(interval.end,newInterval.end);
}
}
result.add(index,newInterval);
return result;

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