Compilare: main.cpp: In function 'int bfs(int)': main.cpp:20:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for(int i=0;i<a[nod].size();i++) | ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:56:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 56 | for(i=0;i<a[y].size();i++) | ~^~~~~~~~~~~~ main.cpp: In function 'int bfs(int)': main.cpp:31:1: warning: control reaches end of non-void function [-Wreturn-type] 31 | } | ^