Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:18:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:34:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[x].size();j++) ^ user.cpp:47:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Q.size();i++) ^