memory.cpp: In function 'void play()':
memory.cpp:7:5: error: 'vector' was not declared in this scope; did you mean 'std::vector'?
7 | vector<int> f;
| ^~~~~~
| std::vector
In file included from /usr/include/c++/9/vector:67,
from /usr/include/c++/9/queue:61,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:86,
from memory.cpp:3:
/usr/include/c++/9/bits/stl_vector.h:386:11: note: 'std::vector' declared here
386 | class vector : protected _Vector_base<_Tp, _Alloc>
| ^~~~~~
memory.cpp:7:12: error: expected primary-expression before 'int'
7 | vector<int> f;
| ^~~
memory.cpp:10:9: error: 'f' was not declared in this scope
10 | f[faceup(i)].push_back(i);
| ^
memory.cpp:13:12: error: 'f' was not declared in this scope
13 | faceup(f[i][0]);
| ^