Eroare de compilare: user.cpp: In function ‘std::string cmlsc(std::ofstream&, std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >)’: user.cpp:15: warning: comparison between signed and unsigned integer expressions user.cpp:19: warning: comparison between signed and unsigned integer expressions user.cpp:25: error: ‘itoa’ was not declared in this scope user.cpp:38: warning: no return statement in function returning non-void