Compilare: main.cpp: In function 'void DFS(int, int, std::vector<int>&, std::vector<std::vector<int> >&)': main.cpp:17:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (auto i = 0; i < A[nod].size(); i++) ~~^~~~~~~~~~~~~~~ main.cpp:27:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < A[nod].size(); j++) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:62:15: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized] nivel[root] = 1; ^