Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:17:80: error: no matching function for call to ‘make_pair(int, int&)’ mymap.insert(make_pair<int, int>(a1*x1*x1*x1+a2*x2*x2*x2+a3*x3*x3*x3,++cont)); ^ user.cpp:17:80: note: candidate is: In file included from /usr/local/include/c++/4.8.0/bits/stl_algobase.h:64:0, from /usr/local/include/c++/4.8.0/bits/char_traits.h:39, from /usr/local/include/c++/4.8.0/ios:40, from /usr/local/include/c++/4.8.0/istream:38, from /usr/local/include/c++/4.8.0/fstream:38, from user.cpp:1: /usr/local/include/c++/4.8.0/bits/stl_pair.h:276:5: note: template<class _T1, class _T2> constexpr std::pair<typename std::__decay_and_strip<_Tp>::__type, typename std::__decay_and_strip<_T2>::__type> std::make_pair(_T1&&, _T2&&) make_pair(_T1&& __x, _T2&& __y) ^ /usr/local/include/c++/4.8.0/bits/stl_pair.h:276:5: note: template argument deduction/substitution failed: user.cpp:17:80: note: cannot convert ‘++ cont’ (type ‘int’) to type ‘int&&’ mymap.insert(make_pair<int, int>(a1*x1*x1*x1+a2*x2*x2*x2+a3*x3*x3*x3,++cont)); ^