Compilare: user.cpp: In function ‘int bfs(int, int)’: user.cpp:46:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();i++) ~^~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:81:26: warning: ‘zjd’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<zid<<' '<<zjd<<' '<<ma+1; ^~~ user.cpp:81:16: warning: ‘zid’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<zid<<' '<<zjd<<' '<<ma+1; ^~~