Compilare: user.cpp: In function ‘int main()’: user.cpp:77:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<unu_pe_doi.size(); i++) { ^ user.cpp:95:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<doi_pe_unu.size(); i++) { ^ user.cpp:110:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<sol.size(); i++) g<<sol[i].first<<" "<<sol[i].second<<"\n"; ^