View Compilation Error

0_0_34519762_18907.cpp: In function 'int main()':
0_0_34519762_18907.cpp:64:30: error: '__gnu_cxx::__alloc_traits<std::allocator<node> >::value_type' has no member named 'u'
                 cout<<ans[i].u<<' '<<ans[i].v<<' '<<ans[i].w<<endl;
                              ^
0_0_34519762_18907.cpp:64:45: error: '__gnu_cxx::__alloc_traits<std::allocator<node> >::value_type' has no member named 'v'
                 cout<<ans[i].u<<' '<<ans[i].v<<' '<<ans[i].w<<endl;
                                             ^