Compilare: user.cpp: In function ‘int bellford(int, long long int)’: user.cpp:36:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<adj[v].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:81:9: warning: unused variable ‘q’ [-Wunused-variable] int q=rand(); ^