What is the use of vector argument passing in min priority queue and Priority queue using comparator class

#1

What is the use of vector argument passing in min priority queue and Priority queue using comparator class
Eg: priority_queue < int, vector < int > ,greater > pq ;
// for min priority queue
priority_queue< int,vector< Person> ,PersonComparator> pq;
// for person comparator

#2

In this what we are doing is making comparator (person comparator)for priority queue , according to which it will sort.

Because std::priority_queue is a class template defined as follows:

template<
    class T,
    class Container = std::vector<T>,
    class Compare = std::less<typename Container::value_type>
> class priority_queue;

As you can see, you can instantiate this class only providing the T , because the rest of the types will be defaulted. You can read more about template default arguments here.

#3

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