Compilare: user.cpp: In function ‘int main()’: user.cpp:74:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < V.size();++i) ~~^~~~~~~~~~ user.cpp:75:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] cout << V[i] << " \n"[i + 1 == V.size()]; ~~~~~~^~~~~~~~~~~