PriQHotel, C++ (gcc)

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//g++  7.4.0

/////////////////////////////////////////////////////////////////////////////
//PriQHotel:
//this code is created by Rezaul Hoque on August 10,2022;update: 18:33
//contact:jewelmrh@yahoo.com;Dhaka,Bangladesh;https://rezaulhoque.wordpress.com,https://hoquestake.blogspot.com
//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning;
//////////////////////////////////////////////////////////////////////////////

#include <iostream>
#include <queue>
#include <string>
using namespace std;

class Hotel{
std::string star;
int rent;

public:
Hotel(std::string s,int r);
std::string getS() const;
int getR() const;
};

class ComS{
public:
bool operator()(const Hotel & h1,const Hotel& h2)
{
   return h1.getS()<h2.getS();
}
};

class ComR{
public:
bool operator()(const Hotel & h1,const Hotel& h2)
{
   return h1.getR()<h2.getR();
}
};

Hotel::Hotel(std::string s,int r)
{
this->star=s;
this->rent=r;
/***
//no need 
priority_queue<Hotel,vector<Hotel>,ComS> QS;

priority_queue<Hotel,vector<Hotel>,ComR> QR;
***/
}
std::string Hotel::getS() const {
return this->star;
}
int Hotel:: getR() const {
return this->rent;
}
int main()
{
Hotel a("***",900);
Hotel b("****",3000);
Hotel c("****",2500);
Hotel d("**",1000);
    priority_queue<Hotel, vector<Hotel>,ComS> QS;
QS.push(a);
QS.push(b);
QS.push(c);
QS.push(d);
std::cout<<"Hotels listed on stars:\nStars  Rent\n";
while (!QS.empty()){
Hotel h=QS.top();
QS.pop();
std::cout<<h.getS()<<" "<<h.getR()<<" \n";
}
std::cout<<"\n";
std::cout<<"Hotels listed on room rent:\nStars Rent\n";
priority_queue<Hotel, vector<Hotel>,ComR> QR;

QR.push(a);
QR.push(b);
QR.push(c);
QR.push(d);

while (!QR.empty()){
Hotel h=QR.top();
QR.pop();
std::cout<<h.getS()<<" "<<h.getR()<<" \n";

}
return 0;
}

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Compilation time: 0.61 sec, absolute running time: 0.14 sec, cpu time: 0.01 sec, memory peak: 5 Mb, absolute service time: 0,81 sec