Compilare: user.cpp: In function ‘int main()’: user.cpp:30:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[i].size();j++) cout<<v[i][j]<<" "; ^ user.cpp:36:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<distanta[i].size();j++) cout<<distanta[i][j]<<" "; ^ user.cpp:45:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[a].size();i++) ^