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#include <iostream>
#include <chrono>
using namespace std;
using namespace std::chrono;
 
int main() {
	time_point<high_resolution_clock> start = high_resolution_clock::now();
	time_point<high_resolution_clock> end = high_resolution_clock::now();
	duration<milli> difference = duration_cast<milli>(end - start);
	// your code goes here
	return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:9:63: error: no matching function for call to 'duration_cast(std::__success_type<std::chrono::duration<long long int, std::ratio<1ll, 1000000000ll> > >::type)'
  duration<milli> difference = duration_cast<milli>(end - start);
                                                               ^
prog.cpp:9:63: note: candidate is:
In file included from prog.cpp:2:0:
/usr/include/c++/4.9/chrono:194:7: note: template<class _ToDur, class _Rep, class _Period> constexpr typename std::enable_if<std::chrono::__is_duration<_Tp>::value, _ToDur>::type std::chrono::duration_cast(const std::chrono::duration<_Rep, _Period>&)
       duration_cast(const duration<_Rep, _Period>& __d)
       ^
/usr/include/c++/4.9/chrono:194:7: note:   template argument deduction/substitution failed:
/usr/include/c++/4.9/chrono: In substitution of 'template<class _ToDur, class _Rep, class _Period> constexpr typename std::enable_if<std::chrono::__is_duration<_Tp>::value, _ToDur>::type std::chrono::duration_cast(const std::chrono::duration<_Rep, _Period>&) [with _ToDur = std::ratio<1ll, 1000ll>; _Rep = <missing>; _Period = <missing>]':
prog.cpp:9:63:   required from here
/usr/include/c++/4.9/chrono:194:7: error: no type named 'type' in 'struct std::enable_if<false, std::ratio<1ll, 1000ll> >'

Standard output is empty