Compilare: user.cpp: In function ‘void test()’: user.cpp:76:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < res.size(); ++i) ^ user.cpp: In function ‘std::vector<int> fnc(std::vector<int>&, std::vector<int>&)’: user.cpp:90:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (n < a.size() + b.size()) ^ user.cpp:95:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i(0); i < a.size(); i++) ^ user.cpp:97:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i(0); i < b.size(); i++) ^