Compilare: user.cpp: In function ‘int main()’: user.cpp:69:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0;j < v[i].size();++j) ^ user.cpp:72:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j < v[i].size() && aux == v[i][j].cable) ^ user.cpp:74:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j >= v[i].size()) ^