Doubt int the line 7

#1

why we pass “vector int”?

#2

HI @Royal_Yashasvi
template <class T, class Container = vector<T>, class Compare = less<typename Container::value_type> > class priority_queue;
this is the actual class template for the priority queue data structure.
As you can see it takes 3 arguments. First one is T (our datatype, int in this case), second one is a container, basicallly tells the the function what type of storage do you want. So basically, our PQ is implemented using that data structure behind the scenes, in this case a vector.
It is a default argument, but if we want to change the third argument to convert it into a MIN HEAP then we also have to specify the second argument, because arguments can be passed in a particular order only.

#3

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