Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:23:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[node].size();i++) ^ user.cpp:30:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<=G[node].size();i++) ^ user.cpp:35:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[node].size();i++) ^