Compilare: user.cpp: In function ‘int DFS(int)’: user.cpp:21:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < vv[nod].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:61:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < v[j].size(); ++k) ^ user.cpp:81:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < v[i].size(); ++j) ^