Compilare: main.cpp: In function 'int dfs(int, int)': main.cpp:41:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<elem>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | for(int i=0; i<graf[nod].size(); i++) | ~^~~~~~~~~~~~~~~~~