Compilare: user.cpp: In function ‘int main()’: user.cpp:36:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(q<vi.size()) ^ user.cpp:39:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int co=q;(co<vi.size())&&(vi[co].first==uni);co++) ^ user.cpp:41:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int co=q;(co<vo.size())&&(vo[co].first==uni);co++) ^ user.cpp:56:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<v.size();i++) ^ user.cpp:73:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<u[0][i].size();j++) ^