Eroare de compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:15:24: error: request for member ‘size’ in ‘v.std::vector<_Tp, _Alloc>::operator[]<int, std::allocator<int> >(((std::vector<int>::size_type)x))’, which is of non-class type ‘__gnu_cxx::__alloc_traits<std::allocator<int> >::value_type {aka int}’ for(int i=0;i<v[x].size();i++) ^ user.cpp:16:23: error: invalid types ‘__gnu_cxx::__alloc_traits<std::allocator<int> >::value_type {aka int}[int]’ for array subscript if(!viz[v[x][i]]) ^ user.cpp:17:21: error: invalid types ‘__gnu_cxx::__alloc_traits<std::allocator<int> >::value_type {aka int}[int]’ for array subscript dfs(v[x][i]); ^ user.cpp: In function ‘int main()’: user.cpp:26:14: error: request for member ‘push_back’ in ‘v.std::vector<_Tp, _Alloc>::operator[]<int, std::allocator<int> >(((std::vector<int>::size_type)x))’, which is of non-class type ‘__gnu_cxx::__alloc_traits<std::allocator<int> >::value_type {aka int}’ v[x].push_back(y); ^ user.cpp:27:14: error: request for member ‘push_back’ in ‘v.std::vector<_Tp, _Alloc>::operator[]<int, std::allocator<int> >(((std::vector<int>::size_type)y))’, which is of non-class type ‘__gnu_cxx::__alloc_traits<std::allocator<int> >::value_type {aka int}’ v[y].push_back(x); ^