Eroare de compilare: user.cpp:8: error: expected ‘;’ before ‘int’ user.cpp: In function ‘int main()’: user.cpp:20: error: ‘class std::vector<int, std::allocator<int> >’ has no member named ‘pushback’ user.cpp:52: error: conflicting declaration ‘std::ofstream f’ user.cpp:12: error: ‘f’ has a previous declaration as ‘std::ifstream f’ user.cpp:56: error: no match for ‘operator<<’ in ‘f << sol.std::vector<_Tp, _Alloc>::operator[] [with _Tp = int, _Alloc = std::allocator<int>](((unsigned int)i))’ user.cpp:29: warning: unused variable ‘cost’