Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:29:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:101:14: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<ans; ^