#include <iostream>
#include <chrono>
#include <vector>
#include <algorithm>
#include <iterator>
 
using Time = std::chrono::high_resolution_clock;
using us = std::chrono::microseconds;
 
int main()
{
  for (int z=0;z<20;z++) {	
    volatile int i, k;
    const int n = 1000000, kmax=200,n_avg=30;
    std::vector<long> v(kmax,0); 
 
    for(k = 0; k < kmax; ++k) {
            auto begin = Time::now();
            for (i = 0; i < n; ++i);  // <--
            auto end = Time::now();
            auto dur = std::chrono::duration_cast<us>(end - begin).count();
            v[k]=dur;  
    }
 
    long avg1=1,avg2=0; 
	for (int j=0; j<n_avg; j++){ avg1+=v[j]; avg2+=v[kmax-1-j]; }
	avg1 /=n_avg; avg2 /=n_avg; 
    std::cout <<"Values between "<< *min_element(v.begin(),v.end())  <<"-"<< *max_element(v.begin(), v.end()) <<"  "; 
    std::cout << "Average "<<n_avg<<" first/last : " << avg1 <<"-"<<avg2<<"  ";
    if (avg1>=avg2) std::cout<< avg1-avg2; 
    std::cout<<std::endl; 
    //std::copy (v.begin(), v.end(), std::ostream_iterator<long>(std::cout,"\n")); 
  }
  return 0;
}

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