Compilare: main.cpp: In function 'int32_t main()': main.cpp:43:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<nod[x].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:50:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<ans.size();i++) cout<<ans[i]<<' '; ~^~~~~~~~~~~