Compilare: main.cpp: In function 'void add_edges_of(int)': main.cpp:17:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<nod[x].size();i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'void compute_answer()': main.cpp:30:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ans.size()!=n-1) ~~~~~~~~~~^~~~~ main.cpp: In function 'int main()': main.cpp:57:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<ans.size();i++) ~^~~~~~~~~~~