Compilare: user.cpp: In function ‘int main()’: user.cpp:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<rr.size();i++) fout<<rr[i].first<<" "<<rr[i].second<<"\n"; ^ user.cpp:21:11: warning: unused variable ‘aux’ [-Wunused-variable] int i,aux; ^ user.cpp: In function ‘void leg1()’: user.cpp:42:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<b.size();i++) ^ user.cpp:45:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<a.size();j++) ^