ID 5940126
Пользователь Тагаев Алишер Мухаммадижонович
Время 20:43<< 27.12.2021 20:44 (23 д. 20:44) 20:44>>
Обработка 20:44 ... 20:44 (3,11 сек.)
Файл 5940126.cpp (CLang++ 5.0.0 + Address Sanitizer)
Турнир 2 курс. Программирование на C++. Турнир 3, осень 2021
Задача C: Initialize vector
Набор тестов
Ограничения Время: 1с Память: 4000Мб
Состояние  [?]
CE Ошибка компиляции
код | результаты
In file included from main.cpp:13:0:
initialize_vector.h: In instantiation of 'auto initialize_vector(T, M, Args ...) [with T = int; M = int; Args = {}]':
initialize_vector.h:5:39:   required from 'auto initialize_vector(T, M, Args ...) [with T = int; M = int; Args = {int}]'
main.cpp:31:49:   required from here
initialize_vector.h:5:39: error: no matching function for call to 'initialize_vector(int&)'
 std::vector<decltype(initialize_vector(value, others...))> vec(
                      ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
initialize_vector.h:4:6: note: candidate: template<class T, class M, class ... Args> auto initialize_vector(T, M, Args ...)
 auto initialize_vector(T value, M arg, Args... others) {
      ^~~~~~~~~~~~~~~~~
initialize_vector.h:4:6: note:   template argument deduction/substitution failed:
initialize_vector.h:5:39: note:   candidate expects at least 2 arguments, 1 provided
 std::vector<decltype(initialize_vector(value, others...))> vec(
                      ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
initialize_vector.h:5:39: error: no matching function for call to 'initialize_vector(int&)'
initialize_vector.h:4:6: note: candidate: template<class T, class M, class ... Args> auto initialize_vector(T, M, Args ...)
 auto initialize_vector(T value, M arg, Args... others) {
      ^~~~~~~~~~~~~~~~~
initialize_vector.h:4:6: note:   template argument deduction/substitution failed:
initialize_vector.h:5:39: note:   candidate expects at least 2 arguments, 1 provided
 std::vector<decltype(initialize_vector(value, others...))> vec(
                      ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/7/bits/stl_construct.h:61:0,
                 from /usr/include/c++/7/bits/stl_tempbuf.h:60,
                 from /usr/include/c++/7/bits/stl_algo.h:62,
                 from /usr/include/c++/7/algorithm:62,
                 from main.cpp:2:
/usr/include/c++/7/ext/alloc_traits.h: In instantiation of 'struct __gnu_cxx::__alloc_traits<std::allocator<void> >':
/usr/include/c++/7/bits/stl_vector.h:77:21:   required from 'struct std::_Vector_base<void, std::allocator<void> >'
/usr/include/c++/7/bits/stl_vector.h:216:11:   required from 'class std::vector<void, std::allocator<void> >'
initialize_vector.h:5:60:   required from 'auto initialize_vector(T, M, Args ...) [with T = int; M = int; Args = {int}]'
main.cpp:31:49:   required from here
/usr/include/c++/7/ext/alloc_traits.h:64:53: error: forming reference to void
     typedef value_type&                             reference;
                                                     ^~~~~~~~~
/usr/include/c++/7/ext/alloc_traits.h:65:53: error: forming reference to void
     typedef const value_type&                       const_reference;
                                                     ^~~~~~~~~~~~~~~
In file included from /usr/include/c++/7/vector:64:0,
                 from /usr/include/c++/7/queue:61,
                 from main.cpp:9:
/usr/include/c++/7/bits/stl_vector.h: In instantiation of 'class std::vector<void, std::allocator<void> >':
initialize_vector.h:5:60:   required from 'auto initialize_vector(T, M, Args ...) [with T = int; M = int; Args = {int}]'
main.cpp:31:49:   required from here
/usr/include/c++/7/bits/stl_vector.h:295:7: error: forming reference to void
       vector(size_type __n, const value_type& __value,
       ^~~~~~
/usr/include/c++/7/bits/stl_vector.h:501:7: error: forming reference to void
       assign(size_type __n, const value_type& __val)
       ^~~~~~
/usr/include/c++/7/bits/stl_vector.h:709:7: error: forming reference to void
       resize(size_type __new_size, const value_type& __x)
       ^~~~~~
/usr/include/c++/7/bits/stl_vector.h:939:7: error: forming reference to void
       push_back(const value_type& __x)
       ^~~~~~~~~
/usr/include/c++/7/bits/stl_vector.h:953:7: error: forming reference to void
       push_back(value_type&& __x)
       ^~~~~~~~~
In file included from /usr/include/c++/7/vector:69:0,
                 from /usr/include/c++/7/queue:61,
                 from main.cpp:9:
/usr/include/c++/7/bits/vector.tcc:114:5: error: forming reference to void
     vector<_Tp, _Alloc>::
     ^~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/7/vector:64:0,
                 from /usr/include/c++/7/queue:61,
                 from main.cpp:9:
/usr/include/c++/7/bits/stl_vector.h:1042:7: error: forming reference to void
       insert(const_iterator __position, value_type&& __x)
       ^~~~~~
/usr/include/c++/7/bits/stl_vector.h:1084:7: error: forming reference to void
       insert(const_iterator __position, size_type __n, const value_type& __x)
       ^~~~~~
/usr/include/c++/7/bits/stl_vector.h:1339:7: error: forming reference to void
       _M_fill_initialize(size_type __n, const value_type& __value)
       ^~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/7/vector:69:0,
                 from /usr/include/c++/7/queue:61,
                 from main.cpp:9:
/usr/include/c++/7/bits/vector.tcc:237:5: error: forming reference to void
     vector<_Tp, _Alloc>::
     ^~~~~~~~~~~~~~~~~~~
/usr/include/c++/7/bits/vector.tcc:458:5: error: forming reference to void
     vector<_Tp, _Alloc>::
     ^~~~~~~~~~~~~~~~~~~
/usr/include/c++/7/bits/vector.tcc:313:5: error: forming reference to void
     vector<_Tp, _Alloc>::
     ^~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/7/vector:64:0,
                 from /usr/include/c++/7/queue:61,
                 from main.cpp:9:
/usr/include/c++/7/bits/stl_vector.h:1496:7: error: forming reference to void
       _M_emplace_aux(const_iterator __position, value_type&& __v)
       ^~~~~~~~~~~~~~
In file included from main.cpp:13:0:
initialize_vector.h: In instantiation of 'auto initialize_vector(T, M, Args ...) [with T = int; M = int; Args = {int}]':
main.cpp:31:49:   required from here
initialize_vector.h:5:60: error: invalid use of void expression
 std::vector<decltype(initialize_vector(value, others...))> vec(
                                                            ^~~
In file included from /usr/include/c++/7/utility:76:0,
                 from /usr/include/c++/7/algorithm:60,
                 from main.cpp:2:
/usr/include/c++/7/initializer_list: In instantiation of 'class std::initializer_list<void>':
initialize_vector.h:7:8:   required from 'auto initialize_vector(T, M, Args ...) [with T = int; M = int; Args = {int}]'
main.cpp:31:49:   required from here
/usr/include/c++/7/initializer_list:51:26: error: forming reference to void
       typedef const _E&  reference;
                          ^~~~~~~~~
/usr/include/c++/7/initializer_list:52:26: error: forming reference to void
       typedef const _E&  const_reference;
                          ^~~~~~~~~~~~~~~
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp: In function 'int main()':
main.cpp:33:18: error: no match for 'operator==' (operand types are 'std::vector<void, std::allocator<void> >' and 'std::vector<std::vector<int, std::allocator<int> > >')
         assert(a == b);
                ~~^~~~
In file included from /usr/include/c++/7/queue:64:0,
                 from main.cpp:9:
/usr/include/c++/7/bits/stl_queue.h:318:5: note: candidate: template<class _Tp, class _Seq> bool std::operator==(const std::queue<_Tp, _Seq>&, const std::queue<_Tp, _Seq>&)
     operator==(const queue<_Tp, _Seq>& __x, const queue<_Tp, _Seq>& __y)
     ^~~~~~~~
/usr/include/c++/7/bits/stl_queue.h:318:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::queue<_Tp, _Seq>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/vector:64:0,
                 from /usr/include/c++/7/queue:61,
                 from main.cpp:9:
/usr/include/c++/7/bits/stl_vector.h:1601:5: note: candidate: template<class _Tp, class _Alloc> bool std::operator==(const std::vector<_Tp, _Alloc>&, const std::vector<_Tp, _Alloc>&)
     operator==(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
     ^~~~~~~~
/usr/include/c++/7/bits/stl_vector.h:1601:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   deduced conflicting types for parameter '_Tp' ('void' and 'std::vector<int, std::allocator<int> >')
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/memory:81:0,
                 from main.cpp:8:
/usr/include/c++/7/bits/shared_ptr.h:378:5: note: candidate: template<class _Tp> bool std::operator==(std::nullptr_t, const std::shared_ptr<_Tp>&)
     operator==(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
     ^~~~~~~~
/usr/include/c++/7/bits/shared_ptr.h:378:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<std::vector<int, std::allocator<int> > >' is not derived from 'const std::shared_ptr<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/memory:81:0,
                 from main.cpp:8:
/usr/include/c++/7/bits/shared_ptr.h:373:5: note: candidate: template<class _Tp> bool std::operator==(const std::shared_ptr<_Tp>&, std::nullptr_t)
     operator==(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
     ^~~~~~~~
/usr/include/c++/7/bits/shared_ptr.h:373:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::shared_ptr<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/memory:81:0,
                 from main.cpp:8:
/usr/include/c++/7/bits/shared_ptr.h:368:5: note: candidate: template<class _Tp, class _Up> bool std::operator==(const std::shared_ptr<_Tp>&, const std::shared_ptr<_Up>&)
     operator==(const shared_ptr<_Tp>& __a, const shared_ptr<_Up>& __b) noexcept
     ^~~~~~~~
/usr/include/c++/7/bits/shared_ptr.h:368:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::shared_ptr<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/shared_ptr.h:52:0,
                 from /usr/include/c++/7/memory:81,
                 from main.cpp:8:
/usr/include/c++/7/bits/shared_ptr_base.h:1420:5: note: candidate: template<class _Tp, __gnu_cxx::_Lock_policy _Lp> bool std::operator==(std::nullptr_t, const std::__shared_ptr<_Tp, _Lp>&)
     operator==(nullptr_t, const __shared_ptr<_Tp, _Lp>& __a) noexcept
     ^~~~~~~~
/usr/include/c++/7/bits/shared_ptr_base.h:1420:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<std::vector<int, std::allocator<int> > >' is not derived from 'const std::__shared_ptr<_Tp, _Lp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/shared_ptr.h:52:0,
                 from /usr/include/c++/7/memory:81,
                 from main.cpp:8:
/usr/include/c++/7/bits/shared_ptr_base.h:1415:5: note: candidate: template<class _Tp, __gnu_cxx::_Lock_policy _Lp> bool std::operator==(const std::__shared_ptr<_Tp, _Lp>&, std::nullptr_t)
     operator==(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept
     ^~~~~~~~
/usr/include/c++/7/bits/shared_ptr_base.h:1415:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::__shared_ptr<_Tp, _Lp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/shared_ptr.h:52:0,
                 from /usr/include/c++/7/memory:81,
                 from main.cpp:8:
/usr/include/c++/7/bits/shared_ptr_base.h:1409:5: note: candidate: template<class _Tp1, class _Tp2, __gnu_cxx::_Lock_policy _Lp> bool std::operator==(const std::__shared_ptr<_Tp1, _Lp>&, const std::__shared_ptr<_Tp2, _Lp>&)
     operator==(const __shared_ptr<_Tp1, _Lp>& __a,
     ^~~~~~~~
/usr/include/c++/7/bits/shared_ptr_base.h:1409:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::__shared_ptr<_Tp1, _Lp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/memory:80:0,
                 from main.cpp:8:
/usr/include/c++/7/bits/unique_ptr.h:690:5: note: candidate: template<class _Tp, class _Dp> bool std::operator==(std::nullptr_t, const std::unique_ptr<_Tp, _Dp>&)
     operator==(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) noexcept
     ^~~~~~~~
/usr/include/c++/7/bits/unique_ptr.h:690:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<std::vector<int, std::allocator<int> > >' is not derived from 'const std::unique_ptr<_Tp, _Dp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/memory:80:0,
                 from main.cpp:8:
/usr/include/c++/7/bits/unique_ptr.h:685:5: note: candidate: template<class _Tp, class _Dp> bool std::operator==(const std::unique_ptr<_Tp, _Dp>&, std::nullptr_t)
     operator==(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) noexcept
     ^~~~~~~~
/usr/include/c++/7/bits/unique_ptr.h:685:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::unique_ptr<_Tp, _Dp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/memory:80:0,
                 from main.cpp:8:
/usr/include/c++/7/bits/unique_ptr.h:679:5: note: candidate: template<class _Tp, class _Dp, class _Up, class _Ep> bool std::operator==(const std::unique_ptr<_Tp, _Dp>&, const std::unique_ptr<_Up, _Ep>&)
     operator==(const unique_ptr<_Tp, _Dp>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/unique_ptr.h:679:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::unique_ptr<_Tp, _Dp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/map:62:0,
                 from main.cpp:7:
/usr/include/c++/7/bits/stl_multimap.h:1059:5: note: candidate: template<class _Key, class _Tp, class _Compare, class _Alloc> bool std::operator==(const std::multimap<_Key, _Tp, _Compare, _Alloc>&, const std::multimap<_Key, _Tp, _Compare, _Alloc>&)
     operator==(const multimap<_Key, _Tp, _Compare, _Alloc>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_multimap.h:1059:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::multimap<_Key, _Tp, _Compare, _Alloc>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/map:61:0,
                 from main.cpp:7:
/usr/include/c++/7/bits/stl_map.h:1394:5: note: candidate: template<class _Key, class _Tp, class _Compare, class _Alloc> bool std::operator==(const std::map<_Key, _Tp, _Compare, _Alloc>&, const std::map<_Key, _Tp, _Compare, _Alloc>&)
     operator==(const map<_Key, _Tp, _Compare, _Alloc>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_map.h:1394:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::map<_Key, _Tp, _Compare, _Alloc>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/stl_map.h:63:0,
                 from /usr/include/c++/7/map:61,
                 from main.cpp:7:
/usr/include/c++/7/tuple:1397:5: note: candidate: template<class ... _TElements, class ... _UElements> constexpr bool std::operator==(const std::tuple<_Tps ...>&, const std::tuple<_Args2 ...>&)
     operator==(const tuple<_TElements...>& __t,
     ^~~~~~~~
/usr/include/c++/7/tuple:1397:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::tuple<_Tps ...>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/tuple:39:0,
                 from /usr/include/c++/7/bits/stl_map.h:63,
                 from /usr/include/c++/7/map:61,
                 from main.cpp:7:
/usr/include/c++/7/array:252:5: note: candidate: template<class _Tp, long unsigned int _Nm> bool std::operator==(const std::array<_Tp, _Nm>&, const std::array<_Tp, _Nm>&)
     operator==(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
     ^~~~~~~~
/usr/include/c++/7/array:252:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::array<_Tp, _Nm>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/map:60:0,
                 from main.cpp:7:
/usr/include/c++/7/bits/stl_tree.h:1533:5: note: candidate: template<class _Key, class _Val, class _KeyOfValue, class _Compare, class _Alloc> bool std::operator==(const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&, const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&)
     operator==(const _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_tree.h:1533:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/map:60:0,
                 from main.cpp:7:
/usr/include/c++/7/bits/stl_tree.h:406:5: note: candidate: template<class _Val> bool std::operator==(const std::_Rb_tree_iterator<_Tp>&, const std::_Rb_tree_const_iterator<_Val>&)
     operator==(const _Rb_tree_iterator<_Val>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_tree.h:406:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::_Rb_tree_iterator<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/node_handle.h:39:0,
                 from /usr/include/c++/7/bits/stl_tree.h:72,
                 from /usr/include/c++/7/map:60,
                 from main.cpp:7:
/usr/include/c++/7/optional:910:5: note: candidate: template<class _Tp, class _Up> constexpr std::__optional_relop_t<decltype ((declval<_Up>() == declval<_Tp>()))> std::operator==(const _Up&, const std::optional<_Tp>&)
     operator==(const _Up& __lhs, const optional<_Tp>& __rhs)
     ^~~~~~~~
/usr/include/c++/7/optional:910:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<std::vector<int, std::allocator<int> > >' is not derived from 'const std::optional<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/node_handle.h:39:0,
                 from /usr/include/c++/7/bits/stl_tree.h:72,
                 from /usr/include/c++/7/map:60,
                 from main.cpp:7:
/usr/include/c++/7/optional:904:5: note: candidate: template<class _Tp, class _Up> constexpr std::__optional_relop_t<decltype ((declval<_Tp>() == declval<_Up>()))> std::operator==(const std::optional<_Tp>&, const _Up&)
     operator==(const optional<_Tp>& __lhs, const _Up& __rhs)
     ^~~~~~~~
/usr/include/c++/7/optional:904:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::optional<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/node_handle.h:39:0,
                 from /usr/include/c++/7/bits/stl_tree.h:72,
                 from /usr/include/c++/7/map:60,
                 from main.cpp:7:
/usr/include/c++/7/optional:848:5: note: candidate: template<class _Tp> constexpr bool std::operator==(std::nullopt_t, const std::optional<_Tp>&)
     operator==(nullopt_t, const optional<_Tp>& __rhs) noexcept
     ^~~~~~~~
/usr/include/c++/7/optional:848:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<std::vector<int, std::allocator<int> > >' is not derived from 'const std::optional<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/node_handle.h:39:0,
                 from /usr/include/c++/7/bits/stl_tree.h:72,
                 from /usr/include/c++/7/map:60,
                 from main.cpp:7:
/usr/include/c++/7/optional:843:5: note: candidate: template<class _Tp> constexpr bool std::operator==(const std::optional<_Tp>&, std::nullopt_t)
     operator==(const optional<_Tp>& __lhs, nullopt_t) noexcept
     ^~~~~~~~
/usr/include/c++/7/optional:843:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::optional<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/node_handle.h:39:0,
                 from /usr/include/c++/7/bits/stl_tree.h:72,
                 from /usr/include/c++/7/map:60,
                 from main.cpp:7:
/usr/include/c++/7/optional:792:5: note: candidate: template<class _Tp, class _Up> constexpr std::__optional_relop_t<decltype ((declval<_Tp>() == declval<_Up>()))> std::operator==(const std::optional<_Tp>&, const std::optional<_Up>&)
     operator==(const optional<_Tp>& __lhs, const optional<_Up>& __rhs)
     ^~~~~~~~
/usr/include/c++/7/optional:792:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::optional<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/iterator:66:0,
                 from main.cpp:6:
/usr/include/c++/7/bits/stream_iterator.h:130:5: note: candidate: template<class _Tp, class _CharT, class _Traits, class _Dist> bool std::operator==(const std::istream_iterator<_Tp, _CharT, _Traits, _Dist>&, const std::istream_iterator<_Tp, _CharT, _Traits, _Dist>&)
     operator==(const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stream_iterator.h:130:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::istream_iterator<_Tp, _CharT, _Traits, _Dist>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/locale_facets.h:48:0,
                 from /usr/include/c++/7/bits/basic_ios.h:37,
                 from /usr/include/c++/7/ios:44,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/bits/streambuf_iterator.h:204:5: note: candidate: template<class _CharT, class _Traits> bool std::operator==(const std::istreambuf_iterator<_CharT, _Traits>&, const std::istreambuf_iterator<_CharT, _Traits>&)
     operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
     ^~~~~~~~
/usr/include/c++/7/bits/streambuf_iterator.h:204:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::istreambuf_iterator<_CharT, _Traits>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/ios_base.h:46:0,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/system_error:311:3: note: candidate: bool std::operator==(const std::error_condition&, const std::error_condition&)
   operator==(const error_condition& __lhs,
   ^~~~~~~~
/usr/include/c++/7/system_error:311:3: note:   no known conversion for argument 1 from 'std::vector<void, std::allocator<void> >' to 'const std::error_condition&'
/usr/include/c++/7/system_error:304:3: note: candidate: bool std::operator==(const std::error_condition&, const std::error_code&)
   operator==(const error_condition& __lhs, const error_code& __rhs) noexcept
   ^~~~~~~~
/usr/include/c++/7/system_error:304:3: note:   no known conversion for argument 1 from 'std::vector<void, std::allocator<void> >' to 'const std::error_condition&'
/usr/include/c++/7/system_error:297:3: note: candidate: bool std::operator==(const std::error_code&, const std::error_condition&)
   operator==(const error_code& __lhs, const error_condition& __rhs) noexcept
   ^~~~~~~~
/usr/include/c++/7/system_error:297:3: note:   no known conversion for argument 1 from 'std::vector<void, std::allocator<void> >' to 'const std::error_code&'
/usr/include/c++/7/system_error:292:3: note: candidate: bool std::operator==(const std::error_code&, const std::error_code&)
   operator==(const error_code& __lhs, const error_code& __rhs) noexcept
   ^~~~~~~~
/usr/include/c++/7/system_error:292:3: note:   no known conversion for argument 1 from 'std::vector<void, std::allocator<void> >' to 'const std::error_code&'
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/bits/basic_string.h:6043:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6043:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/bits/basic_string.h:6031:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const _CharT*, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator==(const _CharT* __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6031:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   mismatched types 'const _CharT*' and 'std::vector<void, std::allocator<void> >'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/bits/basic_string.h:6017:5: note: candidate: template<class _CharT> typename __gnu_cxx::__enable_if<std::__is_char<_Tp>::__value, bool>::__type std::operator==(const std::__cxx11::basic_string<_CharT>&, const std::__cxx11::basic_string<_CharT>&)
     operator==(const basic_string<_CharT>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6017:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::__cxx11::basic_string<_CharT>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/bits/basic_string.h:6009:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6009:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/basic_string.h:48:0,
                 from /usr/include/c++/7/string:52,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/string_view:462:5: note: candidate: template<class _CharT, class _Traits> constexpr bool std::operator==(std::__detail::__idt<std::basic_string_view<_CharT, _Traits> >, std::basic_string_view<_CharT, _Traits>)
     operator==(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
     ^~~~~~~~
/usr/include/c++/7/string_view:462:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<std::vector<int, std::allocator<int> > >' is not derived from 'std::basic_string_view<_CharT, _Traits>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/basic_string.h:48:0,
                 from /usr/include/c++/7/string:52,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/string_view:456:5: note: candidate: template<class _CharT, class _Traits> constexpr bool std::operator==(std::basic_string_view<_CharT, _Traits>, std::__detail::__idt<std::basic_string_view<_CharT, _Traits> >)
     operator==(basic_string_view<_CharT, _Traits> __x,
     ^~~~~~~~
/usr/include/c++/7/string_view:456:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'std::basic_string_view<_CharT, _Traits>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/basic_string.h:48:0,
                 from /usr/include/c++/7/string:52,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/string_view:450:5: note: candidate: template<class _CharT, class _Traits> constexpr bool std::operator==(std::basic_string_view<_CharT, _Traits>, std::basic_string_view<_CharT, _Traits>)
     operator==(basic_string_view<_CharT, _Traits> __x,
     ^~~~~~~~
/usr/include/c++/7/string_view:450:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'std::basic_string_view<_CharT, _Traits>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/iosfwd:40:0,
                 from /usr/include/c++/7/ios:38,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/bits/postypes.h:216:5: note: candidate: template<class _StateT> bool std::operator==(const std::fpos<_StateT>&, const std::fpos<_StateT>&)
     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
     ^~~~~~~~
/usr/include/c++/7/bits/postypes.h:216:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::fpos<_StateT>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/deque:64:0,
                 from main.cpp:4:
/usr/include/c++/7/bits/stl_deque.h:2258:5: note: candidate: template<class _Tp, class _Alloc> bool std::operator==(const std::deque<_Tp, _Alloc>&, const std::deque<_Tp, _Alloc>&)
     operator==(const deque<_Tp, _Alloc>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_deque.h:2258:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::deque<_Tp, _Alloc>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/deque:64:0,
                 from main.cpp:4:
/usr/include/c++/7/bits/stl_deque.h:274:5: note: candidate: template<class _Tp, class _RefL, class _PtrL, class _RefR, class _PtrR> bool std::operator==(const std::_Deque_iterator<_Tp, _Ref, _Ptr>&, const std::_Deque_iterator<_Tp, _RefR, _PtrR>&)
     operator==(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_deque.h:274:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::_Deque_iterator<_Tp, _Ref, _Ptr>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/deque:64:0,
                 from main.cpp:4:
/usr/include/c++/7/bits/stl_deque.h:267:5: note: candidate: template<class _Tp, class _Ref, class _Ptr> bool std::operator==(const std::_Deque_iterator<_Tp, _Ref, _Ptr>&, const std::_Deque_iterator<_Tp, _Ref, _Ptr>&)
     operator==(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_deque.h:267:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::_Deque_iterator<_Tp, _Ref, _Ptr>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/deque:61:0,
                 from main.cpp:4:
/usr/include/c++/7/bits/allocator.h:152:5: note: candidate: template<class _Tp> bool std::operator==(const std::allocator<_Tp>&, const std::allocator<_Tp>&)
     operator==(const allocator<_Tp>&, const allocator<_Tp>&)
     ^~~~~~~~
/usr/include/c++/7/bits/allocator.h:152:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::allocator<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/deque:61:0,
                 from main.cpp:4:
/usr/include/c++/7/bits/allocator.h:146:5: note: candidate: template<class _T1, class _T2> bool std::operator==(const std::allocator<_Tp>&, const std::allocator<_Tp>&)
     operator==(const allocator<_T1>&, const allocator<_T2>&)
     ^~~~~~~~
/usr/include/c++/7/bits/allocator.h:146:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::allocator<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/algorithm:61,
                 from main.cpp:2:
/usr/include/c++/7/bits/stl_iterator.h:1127:5: note: candidate: template<class _Iterator> constexpr bool std::operator==(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorL>&)
     operator==(const move_iterator<_Iterator>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:1127:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::move_iterator<_IteratorL>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/algorithm:61,
                 from main.cpp:2:
/usr/include/c++/7/bits/stl_iterator.h:1121:5: note: candidate: template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)
     operator==(const move_iterator<_IteratorL>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:1121:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::move_iterator<_IteratorL>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/algorithm:61,
                 from main.cpp:2:
/usr/include/c++/7/bits/stl_iterator.h:340:5: note: candidate: template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
     operator==(const reverse_iterator<_IteratorL>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:340:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::reverse_iterator<_Iterator>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/algorithm:61,
                 from main.cpp:2:
/usr/include/c++/7/bits/stl_iterator.h:302:5: note: candidate: template<class _Iterator> constexpr bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
     operator==(const reverse_iterator<_Iterator>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:302:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::reverse_iterator<_Iterator>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/utility:70:0,
                 from /usr/include/c++/7/algorithm:60,
                 from main.cpp:2:
/usr/include/c++/7/bits/stl_pair.h:448:5: note: candidate: template<class _T1, class _T2> constexpr bool std::operator==(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)
     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
     ^~~~~~~~
/usr/include/c++/7/bits/stl_pair.h:448:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::pair<_T1, _T2>'
         assert(a == b);
                     ^
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/c++allocator.h:33:0,
                 from /usr/include/c++/7/bits/allocator.h:46,
                 from /usr/include/c++/7/deque:61,
                 from main.cpp:4:
/usr/include/c++/7/ext/new_allocator.h:155:5: note: candidate: template<class _Tp> bool __gnu_cxx::operator==(const __gnu_cxx::new_allocator<_Tp>&, const __gnu_cxx::new_allocator<_Tp>&)
     operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
     ^~~~~~~~
/usr/include/c++/7/ext/new_allocator.h:155:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const __gnu_cxx::new_allocator<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/algorithm:61,
                 from main.cpp:2:
/usr/include/c++/7/bits/stl_iterator.h:869:5: note: candidate: template<class _Iterator, class _Container> bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_Iterator, _Container>&, const __gnu_cxx::__normal_iterator<_Iterator, _Container>&)
     operator==(const __normal_iterator<_Iterator, _Container>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:869:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const __gnu_cxx::__normal_iterator<_Iterator, _Container>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/algorithm:61,
                 from main.cpp:2:
/usr/include/c++/7/bits/stl_iterator.h:862:5: note: candidate: template<class _IteratorL, class _IteratorR, class _Container> bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_IteratorL, _Container>&, const __gnu_cxx::__normal_iterator<_IteratorR, _Container>&)
     operator==(const __normal_iterator<_IteratorL, _Container>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:862:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:33:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const __gnu_cxx::__normal_iterator<_IteratorL, _Container>'
         assert(a == b);
                     ^
In file included from main.cpp:13:0:
initialize_vector.h: In instantiation of 'auto initialize_vector(T, M, Args ...) [with T = std::__cxx11::basic_string<char>; M = int; Args = {}]':
initialize_vector.h:5:39:   recursively required from 'auto initialize_vector(T, M, Args ...) [with T = std::__cxx11::basic_string<char>; M = int; Args = {int}]'
initialize_vector.h:5:39:   required from 'auto initialize_vector(T, M, Args ...) [with T = std::__cxx11::basic_string<char>; M = int; Args = {int, int}]'
main.cpp:37:63:   required from here
initialize_vector.h:5:39: error: no matching function for call to 'initialize_vector(std::__cxx11::basic_string<char>&)'
 std::vector<decltype(initialize_vector(value, others...))> vec(
                      ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
initialize_vector.h:4:6: note: candidate: template<class T, class M, class ... Args> auto initialize_vector(T, M, Args ...)
 auto initialize_vector(T value, M arg, Args... others) {
      ^~~~~~~~~~~~~~~~~
initialize_vector.h:4:6: note:   template argument deduction/substitution failed:
initialize_vector.h:5:39: note:   candidate expects at least 2 arguments, 1 provided
 std::vector<decltype(initialize_vector(value, others...))> vec(
                      ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
initialize_vector.h:5:39: error: no matching function for call to 'initialize_vector(std::__cxx11::basic_string<char>&)'
initialize_vector.h:4:6: note: candidate: template<class T, class M, class ... Args> auto initialize_vector(T, M, Args ...)
 auto initialize_vector(T value, M arg, Args... others) {
      ^~~~~~~~~~~~~~~~~
initialize_vector.h:4:6: note:   template argument deduction/substitution failed:
initialize_vector.h:5:39: note:   candidate expects at least 2 arguments, 1 provided
 std::vector<decltype(initialize_vector(value, others...))> vec(
                      ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
initialize_vector.h: In instantiation of 'auto initialize_vector(T, M, Args ...) [with T = std::__cxx11::basic_string<char>; M = int; Args = {int}]':
initialize_vector.h:5:39:   required from 'auto initialize_vector(T, M, Args ...) [with T = std::__cxx11::basic_string<char>; M = int; Args = {int, int}]'
main.cpp:37:63:   required from here
initialize_vector.h:5:60: error: invalid use of void expression
 std::vector<decltype(initialize_vector(value, others...))> vec(
                                                            ^~~
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:18: error: no match for 'operator==' (operand types are 'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' and 'std::vector<std::vector<std::vector<std::__cxx11::basic_string<char> > > >')
         assert(a == b);
                ~~^~~~
In file included from /usr/include/c++/7/queue:64:0,
                 from main.cpp:9:
/usr/include/c++/7/bits/stl_queue.h:318:5: note: candidate: template<class _Tp, class _Seq> bool std::operator==(const std::queue<_Tp, _Seq>&, const std::queue<_Tp, _Seq>&)
     operator==(const queue<_Tp, _Seq>& __x, const queue<_Tp, _Seq>& __y)
     ^~~~~~~~
/usr/include/c++/7/bits/stl_queue.h:318:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::queue<_Tp, _Seq>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/vector:64:0,
                 from /usr/include/c++/7/queue:61,
                 from main.cpp:9:
/usr/include/c++/7/bits/stl_vector.h:1601:5: note: candidate: template<class _Tp, class _Alloc> bool std::operator==(const std::vector<_Tp, _Alloc>&, const std::vector<_Tp, _Alloc>&)
     operator==(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
     ^~~~~~~~
/usr/include/c++/7/bits/stl_vector.h:1601:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   deduced conflicting types for parameter '_Tp' ('std::vector<void, std::allocator<void> >' and 'std::vector<std::vector<std::__cxx11::basic_string<char> > >')
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/memory:81:0,
                 from main.cpp:8:
/usr/include/c++/7/bits/shared_ptr.h:378:5: note: candidate: template<class _Tp> bool std::operator==(std::nullptr_t, const std::shared_ptr<_Tp>&)
     operator==(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
     ^~~~~~~~
/usr/include/c++/7/bits/shared_ptr.h:378:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<std::vector<std::__cxx11::basic_string<char> > > >' is not derived from 'const std::shared_ptr<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/memory:81:0,
                 from main.cpp:8:
/usr/include/c++/7/bits/shared_ptr.h:373:5: note: candidate: template<class _Tp> bool std::operator==(const std::shared_ptr<_Tp>&, std::nullptr_t)
     operator==(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
     ^~~~~~~~
/usr/include/c++/7/bits/shared_ptr.h:373:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::shared_ptr<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/memory:81:0,
                 from main.cpp:8:
/usr/include/c++/7/bits/shared_ptr.h:368:5: note: candidate: template<class _Tp, class _Up> bool std::operator==(const std::shared_ptr<_Tp>&, const std::shared_ptr<_Up>&)
     operator==(const shared_ptr<_Tp>& __a, const shared_ptr<_Up>& __b) noexcept
     ^~~~~~~~
/usr/include/c++/7/bits/shared_ptr.h:368:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::shared_ptr<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/shared_ptr.h:52:0,
                 from /usr/include/c++/7/memory:81,
                 from main.cpp:8:
/usr/include/c++/7/bits/shared_ptr_base.h:1420:5: note: candidate: template<class _Tp, __gnu_cxx::_Lock_policy _Lp> bool std::operator==(std::nullptr_t, const std::__shared_ptr<_Tp, _Lp>&)
     operator==(nullptr_t, const __shared_ptr<_Tp, _Lp>& __a) noexcept
     ^~~~~~~~
/usr/include/c++/7/bits/shared_ptr_base.h:1420:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<std::vector<std::__cxx11::basic_string<char> > > >' is not derived from 'const std::__shared_ptr<_Tp, _Lp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/shared_ptr.h:52:0,
                 from /usr/include/c++/7/memory:81,
                 from main.cpp:8:
/usr/include/c++/7/bits/shared_ptr_base.h:1415:5: note: candidate: template<class _Tp, __gnu_cxx::_Lock_policy _Lp> bool std::operator==(const std::__shared_ptr<_Tp, _Lp>&, std::nullptr_t)
     operator==(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept
     ^~~~~~~~
/usr/include/c++/7/bits/shared_ptr_base.h:1415:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::__shared_ptr<_Tp, _Lp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/shared_ptr.h:52:0,
                 from /usr/include/c++/7/memory:81,
                 from main.cpp:8:
/usr/include/c++/7/bits/shared_ptr_base.h:1409:5: note: candidate: template<class _Tp1, class _Tp2, __gnu_cxx::_Lock_policy _Lp> bool std::operator==(const std::__shared_ptr<_Tp1, _Lp>&, const std::__shared_ptr<_Tp2, _Lp>&)
     operator==(const __shared_ptr<_Tp1, _Lp>& __a,
     ^~~~~~~~
/usr/include/c++/7/bits/shared_ptr_base.h:1409:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::__shared_ptr<_Tp1, _Lp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/memory:80:0,
                 from main.cpp:8:
/usr/include/c++/7/bits/unique_ptr.h:690:5: note: candidate: template<class _Tp, class _Dp> bool std::operator==(std::nullptr_t, const std::unique_ptr<_Tp, _Dp>&)
     operator==(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) noexcept
     ^~~~~~~~
/usr/include/c++/7/bits/unique_ptr.h:690:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<std::vector<std::__cxx11::basic_string<char> > > >' is not derived from 'const std::unique_ptr<_Tp, _Dp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/memory:80:0,
                 from main.cpp:8:
/usr/include/c++/7/bits/unique_ptr.h:685:5: note: candidate: template<class _Tp, class _Dp> bool std::operator==(const std::unique_ptr<_Tp, _Dp>&, std::nullptr_t)
     operator==(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) noexcept
     ^~~~~~~~
/usr/include/c++/7/bits/unique_ptr.h:685:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::unique_ptr<_Tp, _Dp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/memory:80:0,
                 from main.cpp:8:
/usr/include/c++/7/bits/unique_ptr.h:679:5: note: candidate: template<class _Tp, class _Dp, class _Up, class _Ep> bool std::operator==(const std::unique_ptr<_Tp, _Dp>&, const std::unique_ptr<_Up, _Ep>&)
     operator==(const unique_ptr<_Tp, _Dp>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/unique_ptr.h:679:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::unique_ptr<_Tp, _Dp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/map:62:0,
                 from main.cpp:7:
/usr/include/c++/7/bits/stl_multimap.h:1059:5: note: candidate: template<class _Key, class _Tp, class _Compare, class _Alloc> bool std::operator==(const std::multimap<_Key, _Tp, _Compare, _Alloc>&, const std::multimap<_Key, _Tp, _Compare, _Alloc>&)
     operator==(const multimap<_Key, _Tp, _Compare, _Alloc>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_multimap.h:1059:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::multimap<_Key, _Tp, _Compare, _Alloc>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/map:61:0,
                 from main.cpp:7:
/usr/include/c++/7/bits/stl_map.h:1394:5: note: candidate: template<class _Key, class _Tp, class _Compare, class _Alloc> bool std::operator==(const std::map<_Key, _Tp, _Compare, _Alloc>&, const std::map<_Key, _Tp, _Compare, _Alloc>&)
     operator==(const map<_Key, _Tp, _Compare, _Alloc>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_map.h:1394:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::map<_Key, _Tp, _Compare, _Alloc>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/stl_map.h:63:0,
                 from /usr/include/c++/7/map:61,
                 from main.cpp:7:
/usr/include/c++/7/tuple:1397:5: note: candidate: template<class ... _TElements, class ... _UElements> constexpr bool std::operator==(const std::tuple<_Tps ...>&, const std::tuple<_Args2 ...>&)
     operator==(const tuple<_TElements...>& __t,
     ^~~~~~~~
/usr/include/c++/7/tuple:1397:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::tuple<_Tps ...>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/tuple:39:0,
                 from /usr/include/c++/7/bits/stl_map.h:63,
                 from /usr/include/c++/7/map:61,
                 from main.cpp:7:
/usr/include/c++/7/array:252:5: note: candidate: template<class _Tp, long unsigned int _Nm> bool std::operator==(const std::array<_Tp, _Nm>&, const std::array<_Tp, _Nm>&)
     operator==(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
     ^~~~~~~~
/usr/include/c++/7/array:252:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::array<_Tp, _Nm>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/map:60:0,
                 from main.cpp:7:
/usr/include/c++/7/bits/stl_tree.h:1533:5: note: candidate: template<class _Key, class _Val, class _KeyOfValue, class _Compare, class _Alloc> bool std::operator==(const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&, const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&)
     operator==(const _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_tree.h:1533:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/map:60:0,
                 from main.cpp:7:
/usr/include/c++/7/bits/stl_tree.h:406:5: note: candidate: template<class _Val> bool std::operator==(const std::_Rb_tree_iterator<_Tp>&, const std::_Rb_tree_const_iterator<_Val>&)
     operator==(const _Rb_tree_iterator<_Val>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_tree.h:406:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::_Rb_tree_iterator<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/node_handle.h:39:0,
                 from /usr/include/c++/7/bits/stl_tree.h:72,
                 from /usr/include/c++/7/map:60,
                 from main.cpp:7:
/usr/include/c++/7/optional:910:5: note: candidate: template<class _Tp, class _Up> constexpr std::__optional_relop_t<decltype ((declval<_Up>() == declval<_Tp>()))> std::operator==(const _Up&, const std::optional<_Tp>&)
     operator==(const _Up& __lhs, const optional<_Tp>& __rhs)
     ^~~~~~~~
/usr/include/c++/7/optional:910:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<std::vector<std::__cxx11::basic_string<char> > > >' is not derived from 'const std::optional<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/node_handle.h:39:0,
                 from /usr/include/c++/7/bits/stl_tree.h:72,
                 from /usr/include/c++/7/map:60,
                 from main.cpp:7:
/usr/include/c++/7/optional:904:5: note: candidate: template<class _Tp, class _Up> constexpr std::__optional_relop_t<decltype ((declval<_Tp>() == declval<_Up>()))> std::operator==(const std::optional<_Tp>&, const _Up&)
     operator==(const optional<_Tp>& __lhs, const _Up& __rhs)
     ^~~~~~~~
/usr/include/c++/7/optional:904:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::optional<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/node_handle.h:39:0,
                 from /usr/include/c++/7/bits/stl_tree.h:72,
                 from /usr/include/c++/7/map:60,
                 from main.cpp:7:
/usr/include/c++/7/optional:848:5: note: candidate: template<class _Tp> constexpr bool std::operator==(std::nullopt_t, const std::optional<_Tp>&)
     operator==(nullopt_t, const optional<_Tp>& __rhs) noexcept
     ^~~~~~~~
/usr/include/c++/7/optional:848:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<std::vector<std::__cxx11::basic_string<char> > > >' is not derived from 'const std::optional<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/node_handle.h:39:0,
                 from /usr/include/c++/7/bits/stl_tree.h:72,
                 from /usr/include/c++/7/map:60,
                 from main.cpp:7:
/usr/include/c++/7/optional:843:5: note: candidate: template<class _Tp> constexpr bool std::operator==(const std::optional<_Tp>&, std::nullopt_t)
     operator==(const optional<_Tp>& __lhs, nullopt_t) noexcept
     ^~~~~~~~
/usr/include/c++/7/optional:843:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::optional<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/node_handle.h:39:0,
                 from /usr/include/c++/7/bits/stl_tree.h:72,
                 from /usr/include/c++/7/map:60,
                 from main.cpp:7:
/usr/include/c++/7/optional:792:5: note: candidate: template<class _Tp, class _Up> constexpr std::__optional_relop_t<decltype ((declval<_Tp>() == declval<_Up>()))> std::operator==(const std::optional<_Tp>&, const std::optional<_Up>&)
     operator==(const optional<_Tp>& __lhs, const optional<_Up>& __rhs)
     ^~~~~~~~
/usr/include/c++/7/optional:792:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::optional<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/iterator:66:0,
                 from main.cpp:6:
/usr/include/c++/7/bits/stream_iterator.h:130:5: note: candidate: template<class _Tp, class _CharT, class _Traits, class _Dist> bool std::operator==(const std::istream_iterator<_Tp, _CharT, _Traits, _Dist>&, const std::istream_iterator<_Tp, _CharT, _Traits, _Dist>&)
     operator==(const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stream_iterator.h:130:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::istream_iterator<_Tp, _CharT, _Traits, _Dist>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/locale_facets.h:48:0,
                 from /usr/include/c++/7/bits/basic_ios.h:37,
                 from /usr/include/c++/7/ios:44,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/bits/streambuf_iterator.h:204:5: note: candidate: template<class _CharT, class _Traits> bool std::operator==(const std::istreambuf_iterator<_CharT, _Traits>&, const std::istreambuf_iterator<_CharT, _Traits>&)
     operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
     ^~~~~~~~
/usr/include/c++/7/bits/streambuf_iterator.h:204:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::istreambuf_iterator<_CharT, _Traits>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/ios_base.h:46:0,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/system_error:311:3: note: candidate: bool std::operator==(const std::error_condition&, const std::error_condition&)
   operator==(const error_condition& __lhs,
   ^~~~~~~~
/usr/include/c++/7/system_error:311:3: note:   no known conversion for argument 1 from 'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' to 'const std::error_condition&'
/usr/include/c++/7/system_error:304:3: note: candidate: bool std::operator==(const std::error_condition&, const std::error_code&)
   operator==(const error_condition& __lhs, const error_code& __rhs) noexcept
   ^~~~~~~~
/usr/include/c++/7/system_error:304:3: note:   no known conversion for argument 1 from 'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' to 'const std::error_condition&'
/usr/include/c++/7/system_error:297:3: note: candidate: bool std::operator==(const std::error_code&, const std::error_condition&)
   operator==(const error_code& __lhs, const error_condition& __rhs) noexcept
   ^~~~~~~~
/usr/include/c++/7/system_error:297:3: note:   no known conversion for argument 1 from 'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' to 'const std::error_code&'
/usr/include/c++/7/system_error:292:3: note: candidate: bool std::operator==(const std::error_code&, const std::error_code&)
   operator==(const error_code& __lhs, const error_code& __rhs) noexcept
   ^~~~~~~~
/usr/include/c++/7/system_error:292:3: note:   no known conversion for argument 1 from 'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' to 'const std::error_code&'
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/bits/basic_string.h:6043:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6043:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/bits/basic_string.h:6031:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const _CharT*, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator==(const _CharT* __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6031:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   mismatched types 'const _CharT*' and 'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/bits/basic_string.h:6017:5: note: candidate: template<class _CharT> typename __gnu_cxx::__enable_if<std::__is_char<_Tp>::__value, bool>::__type std::operator==(const std::__cxx11::basic_string<_CharT>&, const std::__cxx11::basic_string<_CharT>&)
     operator==(const basic_string<_CharT>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6017:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::__cxx11::basic_string<_CharT>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/bits/basic_string.h:6009:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6009:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/basic_string.h:48:0,
                 from /usr/include/c++/7/string:52,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/string_view:462:5: note: candidate: template<class _CharT, class _Traits> constexpr bool std::operator==(std::__detail::__idt<std::basic_string_view<_CharT, _Traits> >, std::basic_string_view<_CharT, _Traits>)
     operator==(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
     ^~~~~~~~
/usr/include/c++/7/string_view:462:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<std::vector<std::__cxx11::basic_string<char> > > >' is not derived from 'std::basic_string_view<_CharT, _Traits>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/basic_string.h:48:0,
                 from /usr/include/c++/7/string:52,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/string_view:456:5: note: candidate: template<class _CharT, class _Traits> constexpr bool std::operator==(std::basic_string_view<_CharT, _Traits>, std::__detail::__idt<std::basic_string_view<_CharT, _Traits> >)
     operator==(basic_string_view<_CharT, _Traits> __x,
     ^~~~~~~~
/usr/include/c++/7/string_view:456:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'std::basic_string_view<_CharT, _Traits>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/basic_string.h:48:0,
                 from /usr/include/c++/7/string:52,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/string_view:450:5: note: candidate: template<class _CharT, class _Traits> constexpr bool std::operator==(std::basic_string_view<_CharT, _Traits>, std::basic_string_view<_CharT, _Traits>)
     operator==(basic_string_view<_CharT, _Traits> __x,
     ^~~~~~~~
/usr/include/c++/7/string_view:450:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'std::basic_string_view<_CharT, _Traits>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/iosfwd:40:0,
                 from /usr/include/c++/7/ios:38,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/bits/postypes.h:216:5: note: candidate: template<class _StateT> bool std::operator==(const std::fpos<_StateT>&, const std::fpos<_StateT>&)
     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
     ^~~~~~~~
/usr/include/c++/7/bits/postypes.h:216:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::fpos<_StateT>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/deque:64:0,
                 from main.cpp:4:
/usr/include/c++/7/bits/stl_deque.h:2258:5: note: candidate: template<class _Tp, class _Alloc> bool std::operator==(const std::deque<_Tp, _Alloc>&, const std::deque<_Tp, _Alloc>&)
     operator==(const deque<_Tp, _Alloc>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_deque.h:2258:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::deque<_Tp, _Alloc>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/deque:64:0,
                 from main.cpp:4:
/usr/include/c++/7/bits/stl_deque.h:274:5: note: candidate: template<class _Tp, class _RefL, class _PtrL, class _RefR, class _PtrR> bool std::operator==(const std::_Deque_iterator<_Tp, _Ref, _Ptr>&, const std::_Deque_iterator<_Tp, _RefR, _PtrR>&)
     operator==(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_deque.h:274:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::_Deque_iterator<_Tp, _Ref, _Ptr>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/deque:64:0,
                 from main.cpp:4:
/usr/include/c++/7/bits/stl_deque.h:267:5: note: candidate: template<class _Tp, class _Ref, class _Ptr> bool std::operator==(const std::_Deque_iterator<_Tp, _Ref, _Ptr>&, const std::_Deque_iterator<_Tp, _Ref, _Ptr>&)
     operator==(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_deque.h:267:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::_Deque_iterator<_Tp, _Ref, _Ptr>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/deque:61:0,
                 from main.cpp:4:
/usr/include/c++/7/bits/allocator.h:152:5: note: candidate: template<class _Tp> bool std::operator==(const std::allocator<_Tp>&, const std::allocator<_Tp>&)
     operator==(const allocator<_Tp>&, const allocator<_Tp>&)
     ^~~~~~~~
/usr/include/c++/7/bits/allocator.h:152:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::allocator<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/deque:61:0,
                 from main.cpp:4:
/usr/include/c++/7/bits/allocator.h:146:5: note: candidate: template<class _T1, class _T2> bool std::operator==(const std::allocator<_Tp>&, const std::allocator<_Tp>&)
     operator==(const allocator<_T1>&, const allocator<_T2>&)
     ^~~~~~~~
/usr/include/c++/7/bits/allocator.h:146:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::allocator<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/algorithm:61,
                 from main.cpp:2:
/usr/include/c++/7/bits/stl_iterator.h:1127:5: note: candidate: template<class _Iterator> constexpr bool std::operator==(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorL>&)
     operator==(const move_iterator<_Iterator>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:1127:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::move_iterator<_IteratorL>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/algorithm:61,
                 from main.cpp:2:
/usr/include/c++/7/bits/stl_iterator.h:1121:5: note: candidate: template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)
     operator==(const move_iterator<_IteratorL>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:1121:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::move_iterator<_IteratorL>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/algorithm:61,
                 from main.cpp:2:
/usr/include/c++/7/bits/stl_iterator.h:340:5: note: candidate: template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
     operator==(const reverse_iterator<_IteratorL>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:340:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::reverse_iterator<_Iterator>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/algorithm:61,
                 from main.cpp:2:
/usr/include/c++/7/bits/stl_iterator.h:302:5: note: candidate: template<class _Iterator> constexpr bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
     operator==(const reverse_iterator<_Iterator>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:302:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::reverse_iterator<_Iterator>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/utility:70:0,
                 from /usr/include/c++/7/algorithm:60,
                 from main.cpp:2:
/usr/include/c++/7/bits/stl_pair.h:448:5: note: candidate: template<class _T1, class _T2> constexpr bool std::operator==(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)
     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
     ^~~~~~~~
/usr/include/c++/7/bits/stl_pair.h:448:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const std::pair<_T1, _T2>'
         assert(a == b);
                     ^
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/c++allocator.h:33:0,
                 from /usr/include/c++/7/bits/allocator.h:46,
                 from /usr/include/c++/7/deque:61,
                 from main.cpp:4:
/usr/include/c++/7/ext/new_allocator.h:155:5: note: candidate: template<class _Tp> bool __gnu_cxx::operator==(const __gnu_cxx::new_allocator<_Tp>&, const __gnu_cxx::new_allocator<_Tp>&)
     operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
     ^~~~~~~~
/usr/include/c++/7/ext/new_allocator.h:155:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const __gnu_cxx::new_allocator<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/algorithm:61,
                 from main.cpp:2:
/usr/include/c++/7/bits/stl_iterator.h:869:5: note: candidate: template<class _Iterator, class _Container> bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_Iterator, _Container>&, const __gnu_cxx::__normal_iterator<_Iterator, _Container>&)
     operator==(const __normal_iterator<_Iterator, _Container>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:869:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const __gnu_cxx::__normal_iterator<_Iterator, _Container>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/algorithm:61,
                 from main.cpp:2:
/usr/include/c++/7/bits/stl_iterator.h:862:5: note: candidate: template<class _IteratorL, class _IteratorR, class _Container> bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_IteratorL, _Container>&, const __gnu_cxx::__normal_iterator<_IteratorR, _Container>&)
     operator==(const __normal_iterator<_IteratorL, _Container>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:862:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:41:21: note:   'std::vector<std::vector<void, std::allocator<void> >, std::allocator<std::vector<void, std::allocator<void> > > >' is not derived from 'const __gnu_cxx::__normal_iterator<_IteratorL, _Container>'
         assert(a == b);
                     ^
main.cpp:54:18: error: no match for 'operator==' (operand types are 'std::vector<void, std::allocator<void> >' and 'std::vector<std::vector<int, std::allocator<int> > >')
         assert(a == b);
                ~~^~~~
In file included from /usr/include/c++/7/queue:64:0,
                 from main.cpp:9:
/usr/include/c++/7/bits/stl_queue.h:318:5: note: candidate: template<class _Tp, class _Seq> bool std::operator==(const std::queue<_Tp, _Seq>&, const std::queue<_Tp, _Seq>&)
     operator==(const queue<_Tp, _Seq>& __x, const queue<_Tp, _Seq>& __y)
     ^~~~~~~~
/usr/include/c++/7/bits/stl_queue.h:318:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::queue<_Tp, _Seq>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/vector:64:0,
                 from /usr/include/c++/7/queue:61,
                 from main.cpp:9:
/usr/include/c++/7/bits/stl_vector.h:1601:5: note: candidate: template<class _Tp, class _Alloc> bool std::operator==(const std::vector<_Tp, _Alloc>&, const std::vector<_Tp, _Alloc>&)
     operator==(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
     ^~~~~~~~
/usr/include/c++/7/bits/stl_vector.h:1601:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   deduced conflicting types for parameter '_Tp' ('void' and 'std::vector<int, std::allocator<int> >')
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/memory:81:0,
                 from main.cpp:8:
/usr/include/c++/7/bits/shared_ptr.h:378:5: note: candidate: template<class _Tp> bool std::operator==(std::nullptr_t, const std::shared_ptr<_Tp>&)
     operator==(nullptr_t, const shared_ptr<_Tp>& __a) noexcept
     ^~~~~~~~
/usr/include/c++/7/bits/shared_ptr.h:378:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<std::vector<int, std::allocator<int> > >' is not derived from 'const std::shared_ptr<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/memory:81:0,
                 from main.cpp:8:
/usr/include/c++/7/bits/shared_ptr.h:373:5: note: candidate: template<class _Tp> bool std::operator==(const std::shared_ptr<_Tp>&, std::nullptr_t)
     operator==(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
     ^~~~~~~~
/usr/include/c++/7/bits/shared_ptr.h:373:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::shared_ptr<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/memory:81:0,
                 from main.cpp:8:
/usr/include/c++/7/bits/shared_ptr.h:368:5: note: candidate: template<class _Tp, class _Up> bool std::operator==(const std::shared_ptr<_Tp>&, const std::shared_ptr<_Up>&)
     operator==(const shared_ptr<_Tp>& __a, const shared_ptr<_Up>& __b) noexcept
     ^~~~~~~~
/usr/include/c++/7/bits/shared_ptr.h:368:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::shared_ptr<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/shared_ptr.h:52:0,
                 from /usr/include/c++/7/memory:81,
                 from main.cpp:8:
/usr/include/c++/7/bits/shared_ptr_base.h:1420:5: note: candidate: template<class _Tp, __gnu_cxx::_Lock_policy _Lp> bool std::operator==(std::nullptr_t, const std::__shared_ptr<_Tp, _Lp>&)
     operator==(nullptr_t, const __shared_ptr<_Tp, _Lp>& __a) noexcept
     ^~~~~~~~
/usr/include/c++/7/bits/shared_ptr_base.h:1420:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<std::vector<int, std::allocator<int> > >' is not derived from 'const std::__shared_ptr<_Tp, _Lp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/shared_ptr.h:52:0,
                 from /usr/include/c++/7/memory:81,
                 from main.cpp:8:
/usr/include/c++/7/bits/shared_ptr_base.h:1415:5: note: candidate: template<class _Tp, __gnu_cxx::_Lock_policy _Lp> bool std::operator==(const std::__shared_ptr<_Tp, _Lp>&, std::nullptr_t)
     operator==(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept
     ^~~~~~~~
/usr/include/c++/7/bits/shared_ptr_base.h:1415:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::__shared_ptr<_Tp, _Lp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/shared_ptr.h:52:0,
                 from /usr/include/c++/7/memory:81,
                 from main.cpp:8:
/usr/include/c++/7/bits/shared_ptr_base.h:1409:5: note: candidate: template<class _Tp1, class _Tp2, __gnu_cxx::_Lock_policy _Lp> bool std::operator==(const std::__shared_ptr<_Tp1, _Lp>&, const std::__shared_ptr<_Tp2, _Lp>&)
     operator==(const __shared_ptr<_Tp1, _Lp>& __a,
     ^~~~~~~~
/usr/include/c++/7/bits/shared_ptr_base.h:1409:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::__shared_ptr<_Tp1, _Lp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/memory:80:0,
                 from main.cpp:8:
/usr/include/c++/7/bits/unique_ptr.h:690:5: note: candidate: template<class _Tp, class _Dp> bool std::operator==(std::nullptr_t, const std::unique_ptr<_Tp, _Dp>&)
     operator==(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) noexcept
     ^~~~~~~~
/usr/include/c++/7/bits/unique_ptr.h:690:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<std::vector<int, std::allocator<int> > >' is not derived from 'const std::unique_ptr<_Tp, _Dp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/memory:80:0,
                 from main.cpp:8:
/usr/include/c++/7/bits/unique_ptr.h:685:5: note: candidate: template<class _Tp, class _Dp> bool std::operator==(const std::unique_ptr<_Tp, _Dp>&, std::nullptr_t)
     operator==(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) noexcept
     ^~~~~~~~
/usr/include/c++/7/bits/unique_ptr.h:685:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::unique_ptr<_Tp, _Dp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/memory:80:0,
                 from main.cpp:8:
/usr/include/c++/7/bits/unique_ptr.h:679:5: note: candidate: template<class _Tp, class _Dp, class _Up, class _Ep> bool std::operator==(const std::unique_ptr<_Tp, _Dp>&, const std::unique_ptr<_Up, _Ep>&)
     operator==(const unique_ptr<_Tp, _Dp>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/unique_ptr.h:679:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::unique_ptr<_Tp, _Dp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/map:62:0,
                 from main.cpp:7:
/usr/include/c++/7/bits/stl_multimap.h:1059:5: note: candidate: template<class _Key, class _Tp, class _Compare, class _Alloc> bool std::operator==(const std::multimap<_Key, _Tp, _Compare, _Alloc>&, const std::multimap<_Key, _Tp, _Compare, _Alloc>&)
     operator==(const multimap<_Key, _Tp, _Compare, _Alloc>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_multimap.h:1059:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::multimap<_Key, _Tp, _Compare, _Alloc>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/map:61:0,
                 from main.cpp:7:
/usr/include/c++/7/bits/stl_map.h:1394:5: note: candidate: template<class _Key, class _Tp, class _Compare, class _Alloc> bool std::operator==(const std::map<_Key, _Tp, _Compare, _Alloc>&, const std::map<_Key, _Tp, _Compare, _Alloc>&)
     operator==(const map<_Key, _Tp, _Compare, _Alloc>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_map.h:1394:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::map<_Key, _Tp, _Compare, _Alloc>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/stl_map.h:63:0,
                 from /usr/include/c++/7/map:61,
                 from main.cpp:7:
/usr/include/c++/7/tuple:1397:5: note: candidate: template<class ... _TElements, class ... _UElements> constexpr bool std::operator==(const std::tuple<_Tps ...>&, const std::tuple<_Args2 ...>&)
     operator==(const tuple<_TElements...>& __t,
     ^~~~~~~~
/usr/include/c++/7/tuple:1397:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::tuple<_Tps ...>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/tuple:39:0,
                 from /usr/include/c++/7/bits/stl_map.h:63,
                 from /usr/include/c++/7/map:61,
                 from main.cpp:7:
/usr/include/c++/7/array:252:5: note: candidate: template<class _Tp, long unsigned int _Nm> bool std::operator==(const std::array<_Tp, _Nm>&, const std::array<_Tp, _Nm>&)
     operator==(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
     ^~~~~~~~
/usr/include/c++/7/array:252:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::array<_Tp, _Nm>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/map:60:0,
                 from main.cpp:7:
/usr/include/c++/7/bits/stl_tree.h:1533:5: note: candidate: template<class _Key, class _Val, class _KeyOfValue, class _Compare, class _Alloc> bool std::operator==(const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&, const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&)
     operator==(const _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_tree.h:1533:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/map:60:0,
                 from main.cpp:7:
/usr/include/c++/7/bits/stl_tree.h:406:5: note: candidate: template<class _Val> bool std::operator==(const std::_Rb_tree_iterator<_Tp>&, const std::_Rb_tree_const_iterator<_Val>&)
     operator==(const _Rb_tree_iterator<_Val>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_tree.h:406:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::_Rb_tree_iterator<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/node_handle.h:39:0,
                 from /usr/include/c++/7/bits/stl_tree.h:72,
                 from /usr/include/c++/7/map:60,
                 from main.cpp:7:
/usr/include/c++/7/optional:910:5: note: candidate: template<class _Tp, class _Up> constexpr std::__optional_relop_t<decltype ((declval<_Up>() == declval<_Tp>()))> std::operator==(const _Up&, const std::optional<_Tp>&)
     operator==(const _Up& __lhs, const optional<_Tp>& __rhs)
     ^~~~~~~~
/usr/include/c++/7/optional:910:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<std::vector<int, std::allocator<int> > >' is not derived from 'const std::optional<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/node_handle.h:39:0,
                 from /usr/include/c++/7/bits/stl_tree.h:72,
                 from /usr/include/c++/7/map:60,
                 from main.cpp:7:
/usr/include/c++/7/optional:904:5: note: candidate: template<class _Tp, class _Up> constexpr std::__optional_relop_t<decltype ((declval<_Tp>() == declval<_Up>()))> std::operator==(const std::optional<_Tp>&, const _Up&)
     operator==(const optional<_Tp>& __lhs, const _Up& __rhs)
     ^~~~~~~~
/usr/include/c++/7/optional:904:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::optional<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/node_handle.h:39:0,
                 from /usr/include/c++/7/bits/stl_tree.h:72,
                 from /usr/include/c++/7/map:60,
                 from main.cpp:7:
/usr/include/c++/7/optional:848:5: note: candidate: template<class _Tp> constexpr bool std::operator==(std::nullopt_t, const std::optional<_Tp>&)
     operator==(nullopt_t, const optional<_Tp>& __rhs) noexcept
     ^~~~~~~~
/usr/include/c++/7/optional:848:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<std::vector<int, std::allocator<int> > >' is not derived from 'const std::optional<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/node_handle.h:39:0,
                 from /usr/include/c++/7/bits/stl_tree.h:72,
                 from /usr/include/c++/7/map:60,
                 from main.cpp:7:
/usr/include/c++/7/optional:843:5: note: candidate: template<class _Tp> constexpr bool std::operator==(const std::optional<_Tp>&, std::nullopt_t)
     operator==(const optional<_Tp>& __lhs, nullopt_t) noexcept
     ^~~~~~~~
/usr/include/c++/7/optional:843:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::optional<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/node_handle.h:39:0,
                 from /usr/include/c++/7/bits/stl_tree.h:72,
                 from /usr/include/c++/7/map:60,
                 from main.cpp:7:
/usr/include/c++/7/optional:792:5: note: candidate: template<class _Tp, class _Up> constexpr std::__optional_relop_t<decltype ((declval<_Tp>() == declval<_Up>()))> std::operator==(const std::optional<_Tp>&, const std::optional<_Up>&)
     operator==(const optional<_Tp>& __lhs, const optional<_Up>& __rhs)
     ^~~~~~~~
/usr/include/c++/7/optional:792:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::optional<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/iterator:66:0,
                 from main.cpp:6:
/usr/include/c++/7/bits/stream_iterator.h:130:5: note: candidate: template<class _Tp, class _CharT, class _Traits, class _Dist> bool std::operator==(const std::istream_iterator<_Tp, _CharT, _Traits, _Dist>&, const std::istream_iterator<_Tp, _CharT, _Traits, _Dist>&)
     operator==(const istream_iterator<_Tp, _CharT, _Traits, _Dist>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stream_iterator.h:130:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::istream_iterator<_Tp, _CharT, _Traits, _Dist>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/locale_facets.h:48:0,
                 from /usr/include/c++/7/bits/basic_ios.h:37,
                 from /usr/include/c++/7/ios:44,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/bits/streambuf_iterator.h:204:5: note: candidate: template<class _CharT, class _Traits> bool std::operator==(const std::istreambuf_iterator<_CharT, _Traits>&, const std::istreambuf_iterator<_CharT, _Traits>&)
     operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
     ^~~~~~~~
/usr/include/c++/7/bits/streambuf_iterator.h:204:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::istreambuf_iterator<_CharT, _Traits>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/ios_base.h:46:0,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/system_error:311:3: note: candidate: bool std::operator==(const std::error_condition&, const std::error_condition&)
   operator==(const error_condition& __lhs,
   ^~~~~~~~
/usr/include/c++/7/system_error:311:3: note:   no known conversion for argument 1 from 'std::vector<void, std::allocator<void> >' to 'const std::error_condition&'
/usr/include/c++/7/system_error:304:3: note: candidate: bool std::operator==(const std::error_condition&, const std::error_code&)
   operator==(const error_condition& __lhs, const error_code& __rhs) noexcept
   ^~~~~~~~
/usr/include/c++/7/system_error:304:3: note:   no known conversion for argument 1 from 'std::vector<void, std::allocator<void> >' to 'const std::error_condition&'
/usr/include/c++/7/system_error:297:3: note: candidate: bool std::operator==(const std::error_code&, const std::error_condition&)
   operator==(const error_code& __lhs, const error_condition& __rhs) noexcept
   ^~~~~~~~
/usr/include/c++/7/system_error:297:3: note:   no known conversion for argument 1 from 'std::vector<void, std::allocator<void> >' to 'const std::error_code&'
/usr/include/c++/7/system_error:292:3: note: candidate: bool std::operator==(const std::error_code&, const std::error_code&)
   operator==(const error_code& __lhs, const error_code& __rhs) noexcept
   ^~~~~~~~
/usr/include/c++/7/system_error:292:3: note:   no known conversion for argument 1 from 'std::vector<void, std::allocator<void> >' to 'const std::error_code&'
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/bits/basic_string.h:6043:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6043:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/bits/basic_string.h:6031:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const _CharT*, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator==(const _CharT* __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6031:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   mismatched types 'const _CharT*' and 'std::vector<void, std::allocator<void> >'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/bits/basic_string.h:6017:5: note: candidate: template<class _CharT> typename __gnu_cxx::__enable_if<std::__is_char<_Tp>::__value, bool>::__type std::operator==(const std::__cxx11::basic_string<_CharT>&, const std::__cxx11::basic_string<_CharT>&)
     operator==(const basic_string<_CharT>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6017:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::__cxx11::basic_string<_CharT>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/string:52:0,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/bits/basic_string.h:6009:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/basic_string.h:6009:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/basic_string.h:48:0,
                 from /usr/include/c++/7/string:52,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/string_view:462:5: note: candidate: template<class _CharT, class _Traits> constexpr bool std::operator==(std::__detail::__idt<std::basic_string_view<_CharT, _Traits> >, std::basic_string_view<_CharT, _Traits>)
     operator==(__detail::__idt<basic_string_view<_CharT, _Traits>> __x,
     ^~~~~~~~
/usr/include/c++/7/string_view:462:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<std::vector<int, std::allocator<int> > >' is not derived from 'std::basic_string_view<_CharT, _Traits>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/basic_string.h:48:0,
                 from /usr/include/c++/7/string:52,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/string_view:456:5: note: candidate: template<class _CharT, class _Traits> constexpr bool std::operator==(std::basic_string_view<_CharT, _Traits>, std::__detail::__idt<std::basic_string_view<_CharT, _Traits> >)
     operator==(basic_string_view<_CharT, _Traits> __x,
     ^~~~~~~~
/usr/include/c++/7/string_view:456:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'std::basic_string_view<_CharT, _Traits>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/basic_string.h:48:0,
                 from /usr/include/c++/7/string:52,
                 from /usr/include/c++/7/bits/locale_classes.h:40,
                 from /usr/include/c++/7/bits/ios_base.h:41,
                 from /usr/include/c++/7/ios:42,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/string_view:450:5: note: candidate: template<class _CharT, class _Traits> constexpr bool std::operator==(std::basic_string_view<_CharT, _Traits>, std::basic_string_view<_CharT, _Traits>)
     operator==(basic_string_view<_CharT, _Traits> __x,
     ^~~~~~~~
/usr/include/c++/7/string_view:450:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'std::basic_string_view<_CharT, _Traits>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/iosfwd:40:0,
                 from /usr/include/c++/7/ios:38,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from main.cpp:5:
/usr/include/c++/7/bits/postypes.h:216:5: note: candidate: template<class _StateT> bool std::operator==(const std::fpos<_StateT>&, const std::fpos<_StateT>&)
     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
     ^~~~~~~~
/usr/include/c++/7/bits/postypes.h:216:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::fpos<_StateT>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/deque:64:0,
                 from main.cpp:4:
/usr/include/c++/7/bits/stl_deque.h:2258:5: note: candidate: template<class _Tp, class _Alloc> bool std::operator==(const std::deque<_Tp, _Alloc>&, const std::deque<_Tp, _Alloc>&)
     operator==(const deque<_Tp, _Alloc>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_deque.h:2258:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::deque<_Tp, _Alloc>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/deque:64:0,
                 from main.cpp:4:
/usr/include/c++/7/bits/stl_deque.h:274:5: note: candidate: template<class _Tp, class _RefL, class _PtrL, class _RefR, class _PtrR> bool std::operator==(const std::_Deque_iterator<_Tp, _Ref, _Ptr>&, const std::_Deque_iterator<_Tp, _RefR, _PtrR>&)
     operator==(const _Deque_iterator<_Tp, _RefL, _PtrL>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_deque.h:274:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::_Deque_iterator<_Tp, _Ref, _Ptr>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/deque:64:0,
                 from main.cpp:4:
/usr/include/c++/7/bits/stl_deque.h:267:5: note: candidate: template<class _Tp, class _Ref, class _Ptr> bool std::operator==(const std::_Deque_iterator<_Tp, _Ref, _Ptr>&, const std::_Deque_iterator<_Tp, _Ref, _Ptr>&)
     operator==(const _Deque_iterator<_Tp, _Ref, _Ptr>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_deque.h:267:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::_Deque_iterator<_Tp, _Ref, _Ptr>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/deque:61:0,
                 from main.cpp:4:
/usr/include/c++/7/bits/allocator.h:152:5: note: candidate: template<class _Tp> bool std::operator==(const std::allocator<_Tp>&, const std::allocator<_Tp>&)
     operator==(const allocator<_Tp>&, const allocator<_Tp>&)
     ^~~~~~~~
/usr/include/c++/7/bits/allocator.h:152:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::allocator<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/deque:61:0,
                 from main.cpp:4:
/usr/include/c++/7/bits/allocator.h:146:5: note: candidate: template<class _T1, class _T2> bool std::operator==(const std::allocator<_Tp>&, const std::allocator<_Tp>&)
     operator==(const allocator<_T1>&, const allocator<_T2>&)
     ^~~~~~~~
/usr/include/c++/7/bits/allocator.h:146:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::allocator<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/algorithm:61,
                 from main.cpp:2:
/usr/include/c++/7/bits/stl_iterator.h:1127:5: note: candidate: template<class _Iterator> constexpr bool std::operator==(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorL>&)
     operator==(const move_iterator<_Iterator>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:1127:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::move_iterator<_IteratorL>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/algorithm:61,
                 from main.cpp:2:
/usr/include/c++/7/bits/stl_iterator.h:1121:5: note: candidate: template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)
     operator==(const move_iterator<_IteratorL>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:1121:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::move_iterator<_IteratorL>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/algorithm:61,
                 from main.cpp:2:
/usr/include/c++/7/bits/stl_iterator.h:340:5: note: candidate: template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
     operator==(const reverse_iterator<_IteratorL>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:340:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::reverse_iterator<_Iterator>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/algorithm:61,
                 from main.cpp:2:
/usr/include/c++/7/bits/stl_iterator.h:302:5: note: candidate: template<class _Iterator> constexpr bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
     operator==(const reverse_iterator<_Iterator>& __x,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:302:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::reverse_iterator<_Iterator>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/utility:70:0,
                 from /usr/include/c++/7/algorithm:60,
                 from main.cpp:2:
/usr/include/c++/7/bits/stl_pair.h:448:5: note: candidate: template<class _T1, class _T2> constexpr bool std::operator==(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)
     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
     ^~~~~~~~
/usr/include/c++/7/bits/stl_pair.h:448:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const std::pair<_T1, _T2>'
         assert(a == b);
                     ^
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/c++allocator.h:33:0,
                 from /usr/include/c++/7/bits/allocator.h:46,
                 from /usr/include/c++/7/deque:61,
                 from main.cpp:4:
/usr/include/c++/7/ext/new_allocator.h:155:5: note: candidate: template<class _Tp> bool __gnu_cxx::operator==(const __gnu_cxx::new_allocator<_Tp>&, const __gnu_cxx::new_allocator<_Tp>&)
     operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
     ^~~~~~~~
/usr/include/c++/7/ext/new_allocator.h:155:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const __gnu_cxx::new_allocator<_Tp>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/algorithm:61,
                 from main.cpp:2:
/usr/include/c++/7/bits/stl_iterator.h:869:5: note: candidate: template<class _Iterator, class _Container> bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_Iterator, _Container>&, const __gnu_cxx::__normal_iterator<_Iterator, _Container>&)
     operator==(const __normal_iterator<_Iterator, _Container>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:869:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const __gnu_cxx::__normal_iterator<_Iterator, _Container>'
         assert(a == b);
                     ^
In file included from /usr/include/c++/7/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/7/algorithm:61,
                 from main.cpp:2:
/usr/include/c++/7/bits/stl_iterator.h:862:5: note: candidate: template<class _IteratorL, class _IteratorR, class _Container> bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_IteratorL, _Container>&, const __gnu_cxx::__normal_iterator<_IteratorR, _Container>&)
     operator==(const __normal_iterator<_IteratorL, _Container>& __lhs,
     ^~~~~~~~
/usr/include/c++/7/bits/stl_iterator.h:862:5: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/7/cassert:44:0,
                 from main.cpp:1:
main.cpp:54:21: note:   'std::vector<void, std::allocator<void> >' is not derived from 'const __gnu_cxx::__normal_iterator<_IteratorL, _Container>'
         assert(a == b);
                     ^
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