Compilare: main.cpp: In function 'int bfs(int)': main.cpp:12:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | for(i=0;i<a[k].size();++i) | ~^~~~~~~~~~~~ main.cpp:18:1: warning: no return statement in function returning non-void [-Wreturn-type] 18 | } | ^