Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:28:35: 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:62:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0;j < nodes[i].size();++j) ^ user.cpp:68:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0;j < nodes[i].size();++j) ^ user.cpp:143:9: warning: array subscript is below array bounds [-Warray-bounds] in_G[a] = 0; ^