Compilare: user.cpp: In function ‘void normalize(std::vector<int>&)’: user.cpp:8:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size() - 1; ++i) { ^ user.cpp: In function ‘std::vector<int> pow(int)’: user.cpp:21:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < sol.size(); ++j) sol[j] *= 2; ^