Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:29: error: no match for ‘operator=’ in ‘it = v[c].std::vector<_Tp, _Alloc>::begin [with _Tp = int, _Alloc = std::allocator<int>]’ /usr/include/c++/4.4/bits/stl_iterator.h:669: note: candidates are: __gnu_cxx::__normal_iterator<int*, std::vector<int, std::allocator<int> > >& __gnu_cxx::__normal_iterator<int*, std::vector<int, std::allocator<int> > >::operator=(const __gnu_cxx::__normal_iterator<int*, std::vector<int, std::allocator<int> > >&) user.cpp:29: error: no match for ‘operator<’ in ‘it < v[c].std::vector<_Tp, _Alloc>::end [with _Tp = int, _Alloc = std::allocator<int>]’ user.cpp:15: warning: unused variable ‘i’