Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:15:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<fii[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:41:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<ord.size();i++) ^ user.cpp:45:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int l=0;l<fii[ord[i]].size();l++) ^