answer.code: In function ‘int main()’:
answer.code:33:13: error: ‘assert’ was not declared in this scope
   33 |             assert(h != 0);
      |             ^~~~~~
answer.code:2:1: note: ‘assert’ is defined in header ‘<cassert>’; did you forget to ‘#include <cassert>’?
    1 | #include <iostream>
  +++ |+#include <cassert>
    2 |