Compilare: user.cpp: In function ‘int bellmanford()’: user.cpp:70:9: warning: unused variable ‘ok’ [-Wunused-variable] int ok=1; ^ user.cpp: In function ‘int main()’: user.cpp:146:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[dv].size();i++) ^