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#include
   
    #include
    
     using namespace std;template
     
      void measure(T&& func){	using namespace std::chrono;	auto start = system_clock::now();	func();	duration
      
        diff = system_clock::now() - start;	cout << "elapsed: " << diff.count() << "seconds" << endl;}// [a,b)void sum(long start, long end, long &ans){	long s = 0;	for (long i = start; i < end; i++)	{		s = s + i;	}	ans = s;}const long s = 100000000;int main(){	measure([]()	{		long ans1, ans2;		thread t1 = thread(sum, 0, s / 2, std::ref(ans1));		thread t2 = thread(sum, s / 2, s, std::ref(ans2));		t1.join();		t2.join();		cout << (ans1 + ans2) << endl;	});	measure([]()	{		long ans;		sum(0, s, ans);		cout << ans << endl;	});	system("pause");}
      
     
    
   

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