error: no match for ‘operator＜‘ (operand types are ‘Interval‘ and ‘Interval‘)（sort函数出错（不能省略第三个参数））
struct Interval { int start; int end; Interval(int s, int e) : start(start), end(e) {}};void insertInterval(vector<Interval>& Intervals, Interval newInterval){ sort(Intervals.begin(),Intervals.end());}出现编译错误，无法用sort对
