I'm getting denial of judgment for problem TROY Query. How to fix this issue?

My submission is 24249934.

I saw in someone's code declaration for struct like this, but I forgot how exactly. Does somebody maybe know how it should be written correctly?

struct Interval
{
   int l, r;
   Interval() l(), r() {}
   Interval(int _l, int _r) l(_l), r(_r) {}
}