Compilare: main.cpp: In function 'void DFS(int, int, const std::vector<std::vector<std::pair<int, int> > >&, ull&, ull&, std::vector<bool>&, int)': main.cpp:33:21: warning: loop variable 'neighbor_pair' creates a copy from type 'const std::pair<int, int>' [-Wrange-loop-construct] 33 | for (const auto neighbor_pair : adj_lists[curr]) { | ^~~~~~~~~~~~~ main.cpp:33:21: note: use reference type to prevent copying 33 | for (const auto neighbor_pair : adj_lists[curr]) { | ^~~~~~~~~~~~~ | &