Compilare: user.cpp: In function ‘std::vector<int> operator*(std::vector<int>, std::vector<int>)’: user.cpp:11:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a.size()+b.size()+10;i++)rez.push_back(0); ^ user.cpp:12:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a.size();i++) ^ user.cpp:13:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<b.size();j++) ^ user.cpp:15:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<rez.size();i++) ^