Compilare: user.cpp: In function ‘void bellmanford()’: user.cpp:40:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<node[vfc].size(); ++i) ^ user.cpp: In function ‘short int check()’: user.cpp:58:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<node[i].size(); ++j) ^ user.cpp: In function ‘void bellmanford()’: user.cpp:35:21: warning: ‘step’ may be used uninitialized in this function [-Wmaybe-uninitialized] while(!q.empty()&&step<=1LL*n*m) ^