virtual test another, C++ (vc++)

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#include <iostream>
#include <chrono>
#include <vector>
using namespace std;
class B2{
		public: int randomNumber=((double) rand() / (RAND_MAX))*10;
		virtual ~B2() = default;
		virtual int f(int n){return -n+randomNumber;}
		int g(int n){return -n+randomNumber;}
};
class C : public B2{
	public: int f(int n) override {return n-randomNumber;}
};
int main() {
	std::vector<B2*> bs;
	const int numTest=1000000;
	for(int n=0;n<numTest;n++){
		if(((double) rand() / (RAND_MAX))>0.5){
			bs.push_back(new B2());
		}else{
			bs.push_back(new C());
		}
	};
	auto t1 = std::chrono::system_clock::now();
	int s=0;
	for(int n=0;n<numTest;n++){ 
		s+=bs[n]->f(n);
	};
	auto t2= std::chrono::system_clock::now();
	for(int n=0;n<numTest;n++){
		s+=bs[n]->g(n);
	};
	auto t3= std::chrono::system_clock::now();
	auto t21=t2-t1;
	auto t32=t3-t2;
	std::cout<<t21.count()<<" "<<t32.count()<<" ratio="<< (((float)t21.count())/t32.count()) << std::endl;
	std::cout<<s<<std::endl;
	for(int n=0;n<numTest;n++){
		delete bs[n];
	};
}

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Compilation time: 2,56 sec, absolute running time: 1,63 sec, absolute service time: 4,2 sec