Compilare: user.cpp: In function ‘int main()’: user.cpp:32:23: 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: In function ‘int leg(int)’: user.cpp:77:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<b.size();i++) ^ user.cpp:79:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<a.size();j++) ^