Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:16:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<v[nod].size(); ++i) ^ user.cpp: In function ‘void dfs2(int)’: user.cpp:23:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<v[nod].size(); ++i) ^