Compilare: main.cpp: In function 'int main()': main.cpp:24:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i < v.size(); ++i) { ~~^~~~~~~~~~ main.cpp:36:49: warning: 'fraier2' may be used uninitialized in this function [-Wmaybe-uninitialized] out << "NU"<<std::endl<<fraier1<< " "<<fraier2; ^ main.cpp:36:37: warning: 'fraier1' may be used uninitialized in this function [-Wmaybe-uninitialized] out << "NU"<<std::endl<<fraier1<< " "<<fraier2; ^~~