Compilare: user.cpp: In function ‘int main()’: user.cpp:46:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size(); ++i) { ^ user.cpp:53:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == v.size() / 2) { ^ user.cpp:117:19: warning: ‘med’ may be used uninitialized in this function [-Wmaybe-uninitialized] out << med->val << std::endl; ^