perm.cpp: In function 'vi construct_permutation(ll)':
perm.cpp:14:31: error: 'all' was not declared in this scope; did you mean 'std::filesystem::perms::all'?
14 | l.insert(l.end(), all(r));
| ^~~
| std::filesystem::perms::all
In file included from /usr/include/c++/13/filesystem:48,
from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:200,
from perm.cpp:1:
/usr/include/c++/13/bits/fs_fwd.h:154:7: note: 'std::filesystem::perms::all' declared here
154 | all = 0777,
| ^~~
perm.cpp:19:7: error: 'using vi = class std::vector<int>' {aka 'class std::vector<int>'} has no member named 'pb'
19 | a.pb(a.size());
| ^~