Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:29:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[node].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:66:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0;k < sorted[i].size();++k) ^ user.cpp:71:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0;j < nodes[e].size();++j) ^ user.cpp:78:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0;j < nodes[e].size();++j) ^