Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:13:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<V[nod].size();++i) ^ user.cpp: In function ‘void dfs_(int)’: user.cpp:20:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<V[nod].size();++i) ^ user.cpp:23:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Q[nod].size();++i) ^