Compilare: user.cpp: In function ‘void interc(std::vector<int>&, std::vector<int>, std::vector<int>)’: user.cpp:14:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0,j=0;i<U.size() && j<V.size();) ^ user.cpp:14:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0,j=0;i<U.size() && j<V.size();) ^ user.cpp:19:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (;i<U.size();++i) ^ user.cpp:21:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (;j<V.size();++j) ^