Compilare: main.cpp: In function 'bool dfs(long long int, long long int)': main.cpp:16:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | for(int i=0;i<adj[nod].size();i++) | ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:70:14: warning: unused variable 'ok' [-Wunused-variable] 70 | bool ok=dfs(1,0); | ^~