Compilare: main.cpp: In function 'void bfs()': main.cpp:21:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for(int k=0; k < adj[Q.front()].size(); k++) | ~~^~~~~~~~~~~~~~~~~~~~~~~