Compilare: user.cpp: In function ‘void Dijkstra(int)’: user.cpp:80:47: warning: narrowing conversion of ‘(& D.std::vector<_Tp, _Alloc>::operator[]<std::vector<double>, std::allocator<std::vector<double> > >(((std::vector<std::vector<double> >::size_type)t.Vecin::x)))->std::vector<_Tp, _Alloc>::operator[]<double, std::allocator<double> >(((std::vector<double>::size_type)i))’ from ‘__gnu_cxx::__alloc_traits<std::allocator<double> >::value_type {aka double}’ to ‘int’ inside { } [-Wnarrowing] Q.push({t.x, i, D[t.x][i]}); ^