Compilare: main.cpp: In function 'int main()': main.cpp:24:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2;i<v.size();++i) ~^~~~~~~~~ main.cpp:40:43: warning: 'fraier2' may be used uninitialized in this function [-Wmaybe-uninitialized] fout<<"NU"<<endl<<fraier1<<fraier2; ^ main.cpp:40:27: warning: 'fraier1' may be used uninitialized in this function [-Wmaybe-uninitialized] fout<<"NU"<<endl<<fraier1<<fraier2; ^~~~~~~