Compilare: main.cpp: In function 'void dfs(int)': main.cpp:10:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 10 | for(int i=0;i<a[nod].size();i++){ | ~^~~~~~~~~~~~~~