# my strange way ------ solve it in a list

• ``````class Solution {
public:
vector<Interval> insert(vector<Interval>& intervals, Interval newInterval) {
list<Interval> temp(intervals.begin(), intervals.end());
list<Interval>::iterator it = temp.begin();
while (it != temp.end())
{
if (newInterval.start >= it->start && newInterval.end <= it->end)
return vector<Interval>(temp.begin(), temp.end());
if (newInterval.end < it->start && (it == temp.begin() || newInterval.start > (prev(it))->end))
{
temp.insert(it, newInterval);
return vector<Interval>(temp.begin(), temp.end());
}
if (newInterval.start < it->start && newInterval.end >= it->start)
{
newInterval.end = max(newInterval.end, it->end);
it = temp.erase(it);
}
else if (newInterval.end > it->end && newInterval.start <= it->end)
{
newInterval.start = min(newInterval.start, it->start);
it = temp.erase(it);
}
else
++ it;
}
temp.insert(it, newInterval);
return vector<Interval>(temp.begin(), temp.end());
}
};
``````

move it to a list, and all the insert and erase shall be acted with O(1),then move it back to the vector.

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