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#include <iostream>
using namespace std;
 
int max;
 
int main() {
	// your code goes here
cout <<max;
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:8:8: error: reference to ‘max’ is ambiguous
 cout <<max;
        ^~~
prog.cpp:4:5: note: candidates are: int max
 int max;
     ^~~
In file included from /usr/include/c++/6/bits/char_traits.h:39:0,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_algobase.h:265:5: note:                 template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)
     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
     ^~~
/usr/include/c++/6/bits/stl_algobase.h:219:5: note:                 template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)
     max(const _Tp& __a, const _Tp& __b)
     ^~~

Standard output is empty