Standard input is empty

Standard output is empty

/usr/include/c++/8/bits/stl_algo.h:4931:
Error: elements in iterator range [__first2, __last2) are not sorted.

Objects involved in the operation:
    iterator "__first2" @ 0x0x7ffe0c7f5a20 {
      type = __gnu_debug::_Safe_iterator<__gnu_cxx::__normal_iterator<int*, std::__cxx1998::vector<int, std::allocator<int> > >, std::__debug::vector<int, std::allocator<int> > > (mutable iterator);
      state = dereferenceable (start-of-sequence);
      references sequence with type 'std::__debug::vector<int, std::allocator<int> >' @ 0x0x7ffe0c7f5ac0
    }
    iterator "__last2" @ 0x0x7ffe0c7f5a50 {
      type = __gnu_debug::_Safe_iterator<__gnu_cxx::__normal_iterator<int*, std::__cxx1998::vector<int, std::allocator<int> > >, std::__debug::vector<int, std::allocator<int> > > (mutable iterator);
      state = past-the-end;
      references sequence with type 'std::__debug::vector<int, std::allocator<int> >' @ 0x0x7ffe0c7f5ac0
    }