Compilare: user.cpp: In function ‘int main()’: user.cpp:76:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v1.size()-1;j++) ^ user.cpp:78:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=v1.size()-1;j<v2.size();j++) ^ user.cpp:83:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v2.size();j++) ^ user.cpp:86:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=v2.size()+1;j<v1.size();j++) ^