platonic8.cpp:4:8: error: deduced class type ‘vector’ in function return type
4 | vector findA(int n, int m) {
| ^~~~~
In file included from /usr/include/c++/9/vector:67,
from /usr/include/c++/9/functional:62,
from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,
from /usr/include/c++/9/algorithm:71,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:65,
from platonic8.cpp:1:
/usr/include/c++/9/bits/stl_vector.h:386:11: note: ‘template<class _Tp, class _Alloc> class std::vector’ declared here
386 | class vector : protected _Vector_base<_Tp, _Alloc>
| ^~~~~~