/in/foo.cc: In function 'int main()':
/in/foo.cc:14:57: error: no matching function for call to 'std::vector<std::vector<long long int> >::vector(int, std::vector<int>)'
  vector<vector<long long>> myHash(200001, vector<int>(0));
                                                         ^
In file included from /usr/include/c++/6/vector:64:0,
                 from /in/foo.cc:2:
/usr/include/c++/6/bits/stl_vector.h:403:9: note: candidate: template<class _InputIterator, class> std::vector<_Tp, _Alloc>::vector(_InputIterator, _InputIterator, const allocator_type&)
         vector(_InputIterator __first, _InputIterator __last,
         ^~~~~~
/usr/include/c++/6/bits/stl_vector.h:403:9: note:   template argument deduction/substitution failed:
/in/foo.cc:14:57: note:   deduced conflicting types for parameter '_InputIterator' ('int' and 'std::vector<int>')
  vector<vector<long long>> myHash(200001, vector<int>(0));
                                                         ^
In file included from /usr/include/c++/6/vector:64:0,
                 from /in/foo.cc:2:
/usr/include/c++/6/bits/stl_vector.h:375:7: note: candidate: std::vector<_Tp, _Alloc>::vector(std::initializer_list<_Tp>, const allocator_type&) [with _Tp = std::vector<long long int>; _Alloc = std::allocator<std::vector<long long int> >; std::vector<_Tp, _Alloc>::allocator_type = std::allocator<std::vector<long long int> >]
       vector(initializer_list<value_type> __l,
       ^~~~~~
/usr/include/c++/6/bits/stl_vector.h:375:7: note:   no known conversion for argument 1 from 'int' to 'std::initializer_list<std::vector<long long int> >'
/usr/include/c++/6/bits/stl_vector.h:350:7: note: candidate: std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, const allocator_type&) [with _Tp = std::vector<long long int>; _Alloc = std::allocator<std::vector<long long int> >; std::vector<_Tp, _Alloc>::allocator_type = std::allocator<std::vector<long long int> >]
       vector(vector&& __rv, const allocator_type& __m)
       ^~~~~~
/usr/include/c++/6/bits/stl_vector.h:350:7: note:   no known conversion for argument 1 from 'int' to 'std::vector<std::vector<long long int> >&&'
/usr/include/c++/6/bits/stl_vector.h:341:7: note: candidate: std::vector<_Tp, _Alloc>::vector(const std::vector<_Tp, _Alloc>&, const allocator_type&) [with _Tp = std::vector<long long int>; _Alloc = std::allocator<std::vector<long long int> >; std::vector<_Tp, _Alloc>::allocator_type = std::allocator<std::vector<long long int> >]
       vector(const vector& __x, const allocator_type& __a)
       ^~~~~~
/usr/include/c++/6/bits/stl_vector.h:341:7: note:   no known conversion for argument 1 from 'int' to 'const std::vector<std::vector<long long int> >&'
/usr/include/c++/6/bits/stl_vector.h:337:7: note: candidate: std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&) [with _Tp = std::vector<long long int>; _Alloc = std::allocator<std::vector<long long int> >]
       vector(vector&& __x) noexcept
       ^~~~~~
/usr/include/c++/6/bits/stl_vector.h:337:7: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/6/bits/stl_vector.h:320:7: note: candidate: std::vector<_Tp, _Alloc>::vector(const std::vector<_Tp, _Alloc>&) [with _Tp = std::vector<long long int>; _Alloc = std::allocator<std::vector<long long int> >]
       vector(const vector& __x)
       ^~~~~~
/usr/include/c++/6/bits/stl_vector.h:320:7: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/6/bits/stl_vector.h:291:7: note: candidate: std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>::size_type, const value_type&, const allocator_type&) [with _Tp = std::vector<long long int>; _Alloc = std::allocator<std::vector<long long int> >; std::vector<_Tp, _Alloc>::size_type = long unsigned int; std::vector<_Tp, _Alloc>::value_type = std::vector<long long int>; std::vector<_Tp, _Alloc>::allocator_type = std::allocator<std::vector<long long int> >]
       vector(size_type __n, const value_type& __value,
       ^~~~~~
/usr/include/c++/6/bits/stl_vector.h:291:7: note:   no known conversion for argument 2 from 'std::vector<int>' to 'const value_type& {aka const std::vector<long long int>&}'
/usr/include/c++/6/bits/stl_vector.h:279:7: note: candidate: std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>::size_type, const allocator_type&) [with _Tp = std::vector<long long int>; _Alloc = std::allocator<std::vector<long long int> >; std::vector<_Tp, _Alloc>::size_type = long unsigned int; std::vector<_Tp, _Alloc>::allocator_type = std::allocator<std::vector<long long int> >]
       vector(size_type __n, const allocator_type& __a = allocator_type())
       ^~~~~~
/usr/include/c++/6/bits/stl_vector.h:279:7: note:   no known conversion for argument 2 from 'std::vector<int>' to 'const allocator_type& {aka const std::allocator<std::vector<long long int> >&}'
/usr/include/c++/6/bits/stl_vector.h:266:7: note: candidate: std::vector<_Tp, _Alloc>::vector(const allocator_type&) [with _Tp = std::vector<long long int>; _Alloc = std::allocator<std::vector<long long int> >; std::vector<_Tp, _Alloc>::allocator_type = std::allocator<std::vector<long long int> >]
       vector(const allocator_type& __a) _GLIBCXX_NOEXCEPT
       ^~~~~~
/usr/include/c++/6/bits/stl_vector.h:266:7: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/6/bits/stl_vector.h:255:7: note: candidate: std::vector<_Tp, _Alloc>::vector() [with _Tp = std::vector<long long int>; _Alloc = std::allocator<std::vector<long long int> >]
       vector()
       ^~~~~~
/usr/include/c++/6/bits/stl_vector.h:255:7: note:   candidate expects 0 arguments, 2 provided
/in/foo.cc:24:31: error: invalid initialization of non-const reference of type 'int&' from an rvalue of type 'int'
          for (int& j: myHash[i]) {
                               ^