Compilare: user.cpp: In function 'bool Bellman_Ford(int, int, std::list<Edge, std::allocator<Edge> >, double**, int, std::list<int, std::allocator<int> >&)': user.cpp:85: warning: 'first_visited' may be used uninitialized in this function user.cpp: In function 'int main()': user.cpp:158: warning: 'mid' may be used uninitialized in this function