Compilare: user.cpp: In function ‘void DFSpostord(int)’: user.cpp:18:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < G[nod].size(); ++i) ^ user.cpp: In function ‘void DFS(int)’: user.cpp:31:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < GT[nod].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:64:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j<comp[i].size(); ++j) ^