strange_device.cpp: In function 'int main()':
strange_device.cpp:20:15: error: no matching function for call to 'find(std::vector<std::vector<int> >::iterator, std::vector<std::vector<int> >::iterator, std::vector<int>&)'
20 | if (find(arr_ans.begin(), arr_ans.end(), tmp) == arr_ans.end()) {
| ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/11/bits/locale_facets.h:48,
from /usr/include/c++/11/bits/basic_ios.h:37,
from /usr/include/c++/11/ios:44,
from /usr/include/c++/11/ostream:38,
from /usr/include/c++/11/iostream:39,
from strange_device.cpp:1:
/usr/include/c++/11/bits/streambuf_iterator.h:421:5: note: candidate: 'template<class _CharT2> typename __gnu_cxx::__enable_if<std::__is_char<_CharT2>::__value, std::istreambuf_iterator<_CharT, std::char_traits<_CharT> > >::__type std::find(std::istreambuf_iterator<_CharT, std::char_traits<_CharT> >, std::istreambuf_iterator<_CharT, std::char_traits<_CharT> >, const _CharT2&)'
421 | find(istreambuf_iterator<_CharT> __first,
| ^~~~
/usr/include/c++/11/bits/streambuf_iterator.h:421:5: note: template argument deduction/substitution failed:
strange_device.cpp:20:15: note: '__gnu_cxx::__normal_iterator<std::vector<int>*, std::vector<std::vector<int> > >' is not derived from 'std::istreambuf_iterator<_CharT, std::char_traits<_CharT> >'
20 | if (find(arr_ans.begin(), arr_ans.end(), tmp) == arr_ans.end()) {
| ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~