Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:30:35: 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:70:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0;j < nodes[i].size();++j) ^ user.cpp:76:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0;j < nodes[i].size();++j) ^