Compilare: main.cpp: In function 'int bfs(int)': main.cpp:29:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | for(int i=0;i<G[nod].size();i++) | ~^~~~~~~~~~~~~~ main.cpp:34:1: warning: no return statement in function returning non-void [-Wreturn-type] 34 | } | ^ main.cpp: At global scope: main.cpp:37:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] 37 | main() | ^~~~